maxwell | Maxwell's daemon, a mysqltojson kafka producer | Pub Sub library

by zendesk Java Version: v1.37.5 License: Non-SPDX

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kandi X-RAY | maxwell Summary

maxwell is a Java library typically used in Messaging, Pub Sub, Kafka applications. maxwell has no bugs, it has no vulnerabilities, it has build file available and it has high support. However maxwell has a Non-SPDX License. You can download it from GitHub, Maven.

This is Maxwell's daemon, an application that reads MySQL binlogs and writes row updates as JSON to Kafka, Kinesis, or other streaming platforms. Maxwell has low operational overhead, requiring nothing but mysql and a place to write to. Its common use cases include ETL, cache building/expiring, metrics collection, search indexing and inter-service communication. Maxwell gives you some of the benefits of event sourcing without having to re-architect your entire platform.

Support

Quality

Security

License

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kandi-support Support

maxwell has a highly active ecosystem.
It has 3224 star(s) with 869 fork(s). There are 526 watchers for this library.
There were 5 major release(s) in the last 6 months.
There are 154 open issues and 790 have been closed. On average issues are closed in 49 days. There are 42 open pull requests and 0 closed requests.
It has a negative sentiment in the developer community.
The latest version of maxwell is v1.37.5

maxwell Support

Best in #Pub Sub

Average in #Pub Sub

maxwell Support

Best in #Pub Sub

Average in #Pub Sub

quality kandi Quality

maxwell has 0 bugs and 0 code smells.

maxwell Quality

Best in #Pub Sub

Average in #Pub Sub

maxwell Quality

Best in #Pub Sub

Average in #Pub Sub

security Security

maxwell has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
maxwell code analysis shows 0 unresolved vulnerabilities.
There are 0 security hotspots that need review.

maxwell Security

Best in #Pub Sub

Average in #Pub Sub

maxwell Security

Best in #Pub Sub

Average in #Pub Sub

license License

maxwell has a Non-SPDX License.
Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

maxwell License

Best in #Pub Sub

Average in #Pub Sub

maxwell License

Best in #Pub Sub

Average in #Pub Sub

build Reuse

maxwell releases are available to install and integrate.
Deployable package is available in Maven.
Build file is available. You can build the component from source.
Installation instructions are not available. Examples and code snippets are available.
maxwell saves you 9510 person hours of effort in developing the same functionality from scratch.
It has 21231 lines of code, 1781 functions and 244 files.
It has medium code complexity. Code complexity directly impacts maintainability of the code.

maxwell Reuse

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Average in #Pub Sub

maxwell Reuse

Best in #Pub Sub

Average in #Pub Sub

Top functions reviewed by kandi - BETA

kandi has reviewed maxwell and discovered the below as its top functions. This is intended to give you an instant insight into maxwell implemented functionality, and help decide if they suit your requirements.

Validate the options .
Updates the maxwells schema .
Serialize this record to JSON .
MurmurHash3 32 .
Restore full schema .
Set up the metrics .
Extracts the row indices from the begin event .
Deserialize from JSON .
Called to reset the column definition
Determine the differences between two columns

maxwell Key Features

Maxwell's daemon, a mysql-to-json kafka producer

maxwell Examples and Code Snippets

See all related Code Snippets

default

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  mysql&gt; insert into `test`.`maxwell` set id = 1, daemon = 'Stanislaw Lem';
  maxwell: {
    "database": "test",
    "table": "maxwell",
    "type": "insert",
    "ts": 1449786310,
    "xid": 940752,
    "commit": true,
    "data": { "id":1, "daemon": "Stanislaw Lem" }
  }

Could not find any factory for identifier 'avro-confluent' that implements 'org.apache.flink.table.factories.DeserializationFormatFactory'

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lazy val mergeStrategy = Seq(
  assembly / assemblyMergeStrategy := {
    case "application.conf" => MergeStrategy.concat
    case "reference.conf" => MergeStrategy.concat
    case m if m.toLowerCase.endsWith("manifest.mf") => MergeStrategy.discard
    case m if m.toLowerCase.matches("meta-inf.*\\.sf$") => MergeStrategy.discard
    case _ => MergeStrategy.first
  }
)

case "META-INF/services/org.apache.flink.table.factories.Factory"  => MergeStrategy.concat
case "META-INF/services/org.apache.flink.table.factories.TableFactory"  => MergeStrategy.concat

-----------------------

lazy val mergeStrategy = Seq(
  assembly / assemblyMergeStrategy := {
    case "application.conf" => MergeStrategy.concat
    case "reference.conf" => MergeStrategy.concat
    case m if m.toLowerCase.endsWith("manifest.mf") => MergeStrategy.discard
    case m if m.toLowerCase.matches("meta-inf.*\\.sf$") => MergeStrategy.discard
    case _ => MergeStrategy.first
  }
)

case "META-INF/services/org.apache.flink.table.factories.Factory"  => MergeStrategy.concat
case "META-INF/services/org.apache.flink.table.factories.TableFactory"  => MergeStrategy.concat

get porper listbox item when using trace

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def sauthor_list(self):
    caut = frame1_lb.curselection()
    print(caut)
    saut = frame1_lb.get(caut[0])  # get the selected item
    print(saut)

Insert colA into DF1 with vals from DF2['colB'] by matching colC in both DFs

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import pandas as pd
dfa = pd.read_csv('csv_a.csv')
dfa.set_index('StockID', inplace=True)
dfb = pd.read_csv('csv_b.csv')

#remove incomplete rows (i.e. without Category/StockID columns)
dfb_tmp = dfb[dfb['StockID'].notnull()]

def myfunc(row):
    # NB: Use row.name because row['StockID'] is the index
    if row.name in list(dfb_tmp['StockID']):
        return dfb_tmp.loc[dfb_tmp['StockID'] == row.name]['Category'].values[0]
dfa['Cat'] = dfa.apply(lambda row: myfunc(row), axis=1)

print(dfa)

StockID Brand   ToolName    Price   Cat
ABC123  Maxwell ToolA       1.25    CatThis
BCD234  Charton ToolB       2.22    CatShop
CDE345  Bingley ToolC       3.33    CatThings
DEF789  Charton ToolD       1.44    CatShop

-----------------------

import pandas as pd
dfa = pd.read_csv('csv_a.csv')
dfa.set_index('StockID', inplace=True)
dfb = pd.read_csv('csv_b.csv')

#remove incomplete rows (i.e. without Category/StockID columns)
dfb_tmp = dfb[dfb['StockID'].notnull()]

def myfunc(row):
    # NB: Use row.name because row['StockID'] is the index
    if row.name in list(dfb_tmp['StockID']):
        return dfb_tmp.loc[dfb_tmp['StockID'] == row.name]['Category'].values[0]
dfa['Cat'] = dfa.apply(lambda row: myfunc(row), axis=1)

print(dfa)

StockID Brand   ToolName    Price   Cat
ABC123  Maxwell ToolA       1.25    CatThis
BCD234  Charton ToolB       2.22    CatShop
CDE345  Bingley ToolC       3.33    CatThings
DEF789  Charton ToolD       1.44    CatShop

-----------------------

df_a['Cat'] = df_a['StockID'].map(dict(zip(df_b['StockID'], df_b['Category'])))

df_a['Cat'] = df_a.index.map(dict(zip(df_b['StockID'], df_b['Category'])))
                   ^^^^^

-----------------------

df_a['Cat'] = df_a['StockID'].map(dict(zip(df_b['StockID'], df_b['Category'])))

df_a['Cat'] = df_a.index.map(dict(zip(df_b['StockID'], df_b['Category'])))
                   ^^^^^

No any output from hello world of node.js redis

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(async () => {
  const client = createClient();

  client.on('error', (err) => console.log('Redis Client Error', err));

  await client.connect();

  await client.set('key', 'value');
  const value = await client.get('key');
  await client.quit();
})();

Plotting Maxwellian Distribution in Julia

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julia> (m_e/(2*pi*k*T_M))^1.5
1.0769341115495682e-27

julia> ylims!(-1e-28, 2e-27)

-----------------------

julia> (m_e/(2*pi*k*T_M))^1.5
1.0769341115495682e-27

julia> ylims!(-1e-28, 2e-27)

How do i populate three sections in a tableview with SwiftyJSON

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struct Section {
    let name : String
    let users : [User]
}

struct User : Decodable {
    let name, password, username, authority : String
    let id : Int
}

var sections = [Section]()

let jsonString = """
[{
  "name" : "Oliver",
  "password" : "1234",
  "username" : "Ramy",
  "id" : 84560,
  "authority" : "Manager"
}, {
  "name" : "Maxwell",
  "password" : "1234",
  "username" : "Omar",
  "id" : 84561,
  "authority" : "Accountant"
}, {
  "name" : "Tom",
  "password" : "1234",
  "username" : "Ahmed",
  "id" : 84562,
  "authority" : "Accountant"
}]
"""

do {
    let users = try JSONDecoder().decode([User].self, from: Data(jsonString.utf8))
    let grouped = Dictionary(grouping: users, by: \.authority)
    sections = grouped.map(Section.init)
    
    print(sections)
} catch {
    print(error)
}

func numberOfSections(in tableView: UITableView) -> Int {
    return sections.count
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return sections[section].users.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "usersTVC", for: indexPath)
    let user = sections[indexPath.section].users[indexPath.row]
    cell.textLabel?.text = "ID: \(user.id) - \(user.name)"
    return cell
}

AF.request(url, method: .post, parameters: data, headers: headers).responseDecodable(of: [User].self, decoder: JSONDecoder()) { response in
    switch response.result {
        case .success(let users): 
           let grouped = Dictionary(grouping: users, by: \.authority)
           sections = grouped.map(Section.init)
        case .failure(let error): print(error)

-----------------------

struct Section {
    let name : String
    let users : [User]
}

struct User : Decodable {
    let name, password, username, authority : String
    let id : Int
}

var sections = [Section]()

let jsonString = """
[{
  "name" : "Oliver",
  "password" : "1234",
  "username" : "Ramy",
  "id" : 84560,
  "authority" : "Manager"
}, {
  "name" : "Maxwell",
  "password" : "1234",
  "username" : "Omar",
  "id" : 84561,
  "authority" : "Accountant"
}, {
  "name" : "Tom",
  "password" : "1234",
  "username" : "Ahmed",
  "id" : 84562,
  "authority" : "Accountant"
}]
"""

do {
    let users = try JSONDecoder().decode([User].self, from: Data(jsonString.utf8))
    let grouped = Dictionary(grouping: users, by: \.authority)
    sections = grouped.map(Section.init)
    
    print(sections)
} catch {
    print(error)
}

func numberOfSections(in tableView: UITableView) -> Int {
    return sections.count
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return sections[section].users.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "usersTVC", for: indexPath)
    let user = sections[indexPath.section].users[indexPath.row]
    cell.textLabel?.text = "ID: \(user.id) - \(user.name)"
    return cell
}

AF.request(url, method: .post, parameters: data, headers: headers).responseDecodable(of: [User].self, decoder: JSONDecoder()) { response in
    switch response.result {
        case .success(let users): 
           let grouped = Dictionary(grouping: users, by: \.authority)
           sections = grouped.map(Section.init)
        case .failure(let error): print(error)

-----------------------

struct Section {
    let name : String
    let users : [User]
}

struct User : Decodable {
    let name, password, username, authority : String
    let id : Int
}

var sections = [Section]()

let jsonString = """
[{
  "name" : "Oliver",
  "password" : "1234",
  "username" : "Ramy",
  "id" : 84560,
  "authority" : "Manager"
}, {
  "name" : "Maxwell",
  "password" : "1234",
  "username" : "Omar",
  "id" : 84561,
  "authority" : "Accountant"
}, {
  "name" : "Tom",
  "password" : "1234",
  "username" : "Ahmed",
  "id" : 84562,
  "authority" : "Accountant"
}]
"""

do {
    let users = try JSONDecoder().decode([User].self, from: Data(jsonString.utf8))
    let grouped = Dictionary(grouping: users, by: \.authority)
    sections = grouped.map(Section.init)
    
    print(sections)
} catch {
    print(error)
}

func numberOfSections(in tableView: UITableView) -> Int {
    return sections.count
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return sections[section].users.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "usersTVC", for: indexPath)
    let user = sections[indexPath.section].users[indexPath.row]
    cell.textLabel?.text = "ID: \(user.id) - \(user.name)"
    return cell
}

AF.request(url, method: .post, parameters: data, headers: headers).responseDecodable(of: [User].self, decoder: JSONDecoder()) { response in
    switch response.result {
        case .success(let users): 
           let grouped = Dictionary(grouping: users, by: \.authority)
           sections = grouped.map(Section.init)
        case .failure(let error): print(error)

-----------------------

struct Section {
    let name : String
    let users : [User]
}

struct User : Decodable {
    let name, password, username, authority : String
    let id : Int
}

var sections = [Section]()

let jsonString = """
[{
  "name" : "Oliver",
  "password" : "1234",
  "username" : "Ramy",
  "id" : 84560,
  "authority" : "Manager"
}, {
  "name" : "Maxwell",
  "password" : "1234",
  "username" : "Omar",
  "id" : 84561,
  "authority" : "Accountant"
}, {
  "name" : "Tom",
  "password" : "1234",
  "username" : "Ahmed",
  "id" : 84562,
  "authority" : "Accountant"
}]
"""

do {
    let users = try JSONDecoder().decode([User].self, from: Data(jsonString.utf8))
    let grouped = Dictionary(grouping: users, by: \.authority)
    sections = grouped.map(Section.init)
    
    print(sections)
} catch {
    print(error)
}

func numberOfSections(in tableView: UITableView) -> Int {
    return sections.count
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return sections[section].users.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "usersTVC", for: indexPath)
    let user = sections[indexPath.section].users[indexPath.row]
    cell.textLabel?.text = "ID: \(user.id) - \(user.name)"
    return cell
}

AF.request(url, method: .post, parameters: data, headers: headers).responseDecodable(of: [User].self, decoder: JSONDecoder()) { response in
    switch response.result {
        case .success(let users): 
           let grouped = Dictionary(grouping: users, by: \.authority)
           sections = grouped.map(Section.init)
        case .failure(let error): print(error)

-----------------------

struct Section {
    let name : String
    let users : [User]
}

struct User : Decodable {
    let name, password, username, authority : String
    let id : Int
}

var sections = [Section]()

let jsonString = """
[{
  "name" : "Oliver",
  "password" : "1234",
  "username" : "Ramy",
  "id" : 84560,
  "authority" : "Manager"
}, {
  "name" : "Maxwell",
  "password" : "1234",
  "username" : "Omar",
  "id" : 84561,
  "authority" : "Accountant"
}, {
  "name" : "Tom",
  "password" : "1234",
  "username" : "Ahmed",
  "id" : 84562,
  "authority" : "Accountant"
}]
"""

do {
    let users = try JSONDecoder().decode([User].self, from: Data(jsonString.utf8))
    let grouped = Dictionary(grouping: users, by: \.authority)
    sections = grouped.map(Section.init)
    
    print(sections)
} catch {
    print(error)
}

func numberOfSections(in tableView: UITableView) -> Int {
    return sections.count
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return sections[section].users.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "usersTVC", for: indexPath)
    let user = sections[indexPath.section].users[indexPath.row]
    cell.textLabel?.text = "ID: \(user.id) - \(user.name)"
    return cell
}

AF.request(url, method: .post, parameters: data, headers: headers).responseDecodable(of: [User].self, decoder: JSONDecoder()) { response in
    switch response.result {
        case .success(let users): 
           let grouped = Dictionary(grouping: users, by: \.authority)
           sections = grouped.map(Section.init)
        case .failure(let error): print(error)

how to fix template does not exist in Django?

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def html(request):
    return render(request, 'Blog/index.html')

-----------------------

TEMPLATES = [
    {
        ...
        'DIRS': [os.path.join(BASE_DIR,'templates')],#add this line
        ...
]

return render(request,"template_folder/template_name.html")

-----------------------

TEMPLATES = [
    {
        ...
        'DIRS': [os.path.join(BASE_DIR,'templates')],#add this line
        ...
]

return render(request,"template_folder/template_name.html")

Collect similar terms in sympy

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In [2]: e, a, m, n = symbols('e, a, m, n')

In [3]: sol = solveset(Eq((e-m)/(e+2*m), n*(a-m)/(a+2*m)), m)

In [4]: s1, s2 = sol.args[0]

In [5]: s1
Out[5]: 
                           _____________________________________________________________________________
                          ╱    2  2      2      2          2                       2  2      2        2 
2⋅a⋅n + a - e⋅n - 2⋅e   ╲╱  4⋅a ⋅n  + 4⋅a ⋅n + a  + 4⋅a⋅e⋅n  - 26⋅a⋅e⋅n + 4⋅a⋅e + e ⋅n  + 4⋅e ⋅n + 4⋅e  
───────────────────── - ────────────────────────────────────────────────────────────────────────────────
      4⋅(n - 1)                                            4⋅(n - 1)                                    

In [6]: s1.collect(e, lambda c: c.factor() if c.is_polynomial() else c)
Out[6]: 
                              _______________________________________________________
                             ╱  2          2         ⎛   2           ⎞    2        2 
a⋅(2⋅n + 1) + e⋅(-n - 2)   ╲╱  a ⋅(2⋅n + 1)  + 2⋅a⋅e⋅⎝2⋅n  - 13⋅n + 2⎠ + e ⋅(n + 2)  
──────────────────────── - ──────────────────────────────────────────────────────────
       4⋅(n - 1)                                   4⋅(n - 1)                         

In [7]: s2.collect(e, lambda c: c.factor() if c.is_polynomial() else c)
Out[7]: 
                              _______________________________________________________
                             ╱  2          2         ⎛   2           ⎞    2        2 
a⋅(2⋅n + 1) + e⋅(-n - 2)   ╲╱  a ⋅(2⋅n + 1)  + 2⋅a⋅e⋅⎝2⋅n  - 13⋅n + 2⎠ + e ⋅(n + 2)  
──────────────────────── + ──────────────────────────────────────────────────────────
       4⋅(n - 1)                                   4⋅(n - 1)

D3.js style and class override not work as my expectation

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d3.select("table").select("tr").selectAll("td").classed("bold-header", true);

d3.select("table").selectAll("tr:not(:first-child)").style("background-color", "lightblue").style("width", "100px");

d3.select("table").select("tr").classed("bold-header", true);

 .bold-header{
        background-color:navy;
        color:white;
    }

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<table border="1">
    <tr>
        <td>ID</td>
        <td>Name</td>
    </tr>
    <tr>
        <td>001</td>
        <td>John</td>
    </tr>
    <tr>
        <td>002</td>
        <td>Alex</td>
    </tr>
    <tr>         
        <td>003</td>
        <td>Maxwell</td>
    </tr>
</table>

-----------------------

d3.select("table").select("tr").selectAll("td").classed("bold-header", true);

d3.select("table").selectAll("tr:not(:first-child)").style("background-color", "lightblue").style("width", "100px");

d3.select("table").select("tr").classed("bold-header", true);

 .bold-header{
        background-color:navy;
        color:white;
    }

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<table border="1">
    <tr>
        <td>ID</td>
        <td>Name</td>
    </tr>
    <tr>
        <td>001</td>
        <td>John</td>
    </tr>
    <tr>
        <td>002</td>
        <td>Alex</td>
    </tr>
    <tr>         
        <td>003</td>
        <td>Maxwell</td>
    </tr>
</table>

-----------------------

d3.select("table").select("tr").selectAll("td").classed("bold-header", true);

d3.select("table").selectAll("tr:not(:first-child)").style("background-color", "lightblue").style("width", "100px");

d3.select("table").select("tr").classed("bold-header", true);

 .bold-header{
        background-color:navy;
        color:white;
    }

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<table border="1">
    <tr>
        <td>ID</td>
        <td>Name</td>
    </tr>
    <tr>
        <td>001</td>
        <td>John</td>
    </tr>
    <tr>
        <td>002</td>
        <td>Alex</td>
    </tr>
    <tr>         
        <td>003</td>
        <td>Maxwell</td>
    </tr>
</table>

-----------------------

d3.select("table").select("tr").selectAll("td").classed("bold-header", true);

d3.select("table").selectAll("tr:not(:first-child)").style("background-color", "lightblue").style("width", "100px");

d3.select("table").select("tr").classed("bold-header", true);

 .bold-header{
        background-color:navy;
        color:white;
    }

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<table border="1">
    <tr>
        <td>ID</td>
        <td>Name</td>
    </tr>
    <tr>
        <td>001</td>
        <td>John</td>
    </tr>
    <tr>
        <td>002</td>
        <td>Alex</td>
    </tr>
    <tr>         
        <td>003</td>
        <td>Maxwell</td>
    </tr>
</table>

EASY: How do I separate elements grabbed by class name using Selenium Webdriver?

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driver.find_elements_by_css_selector('.sceneColActors a')

driver.find_elements_by_class_name('sceneColActors')

-----------------------

driver.find_elements_by_css_selector('.sceneColActors a')

driver.find_elements_by_class_name('sceneColActors')

See all related Code Snippets

Community Discussions

Trending Discussions on maxwell

Could not find any factory for identifier 'avro-confluent' that implements 'org.apache.flink.table.factories.DeserializationFormatFactory'
get porper listbox item when using trace
Insert colA into DF1 with vals from DF2['colB'] by matching colC in both DFs
No any output from hello world of node.js redis
Plotting Maxwellian Distribution in Julia
How do i populate three sections in a tableview with SwiftyJSON
how to fix template does not exist in Django?
Collect similar terms in sympy
D3.js style and class override not work as my expectation
EASY: How do I separate elements grabbed by class name using Selenium Webdriver?

Trending Discussions on maxwell

QUESTION

Could not find any factory for identifier 'avro-confluent' that implements 'org.apache.flink.table.factories.DeserializationFormatFactory'

Asked 2022-Feb-27 at 19:32

I have a Flink job that runs well locally but fails when I try to flink run the job on cluster. The error happens when trying to load data from Kafka via 'connector' = 'kafka'. I am using Flink-Table API and confluent-avro format for reading data from Kafka.

So basically i created a table which reads data from kafka topic:

    val inputTableSQL =
      s"""CREATE TABLE input_table (
         |  -- key of the topic
         |  key BYTES NOT NULL,
         |
         |  -- a few columns mapped to the Avro fields of the Kafka value
         |  id STRING,
         |
         |) WITH (
         |
         |  'connector' = 'kafka',
         |  'topic' = '${KafkaConfiguration.InputTopicName}',
         |  'scan.startup.mode' = 'latest-offset',
         |
         |  -- UTF-8 string as Kafka keys, using the 'key' table column
         |  'key.format' = 'raw',
         |  'key.fields' = 'key',
         |
         |  'value.format' = 'avro-confluent',
         |  'value.avro-confluent.schema-registry.url' = '${KafkaConfiguration.KafkaConsumerSchemaRegistryUrl}',
         |  'value.fields-include' = 'EXCEPT_KEY'
         |)
         |""".stripMargin
    val inputTable = tableEnv.executeSql(inputTableSQL)

and then i created another table, which i will use as output table:

val outputTableSQL =
      s"""CREATE TABLE custom_avro_output_table (
         |  -- key of the topic
         |  key BYTES NOT NULL,
         |
         |  -- a few columns mapped to the Avro fields of the Kafka value
         |  ID STRING
         |) WITH (
         |
         |  'connector' = 'kafka',
         |  'topic' = '${KafkaConfiguration.OutputTopicName}',
         |  'properties.bootstrap.servers' = '${KafkaConfiguration.KafkaProducerBootstrapServers}',
         |
         |  -- UTF-8 string as Kafka keys, using the 'key' table column
         |  'key.format' = 'raw',
         |  'key.fields' = 'key',
         |
         |  $outputFormatSettings
         |  'value.fields-include' = 'EXCEPT_KEY'
         |)
         |""".stripMargin

    val outputTableCreationResult = tableEnv.executeSql(outputTableSQL)
    
val customInsertSQL =
      """INSERT INTO custom_avro_output_table
        |SELECT key, id
        |  FROM input_table
        | WHERE userAgent LIKE '%ost%'
        |""".stripMargin

    val customInsertResult = tableEnv.executeSql(customInsertSQL)

when i run this in local machine, everything works fine, but when i run it in cluster, it crashes.

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_282]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_282]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_282]
    at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:355) ~[flink-dist_2.12-1.13.1.jar:1.13.1]
    ... 13 more
Caused by: org.apache.flink.table.api.ValidationException: Could not find any factory for identifier 'avro-confluent' that implements 'org.apache.flink.table.factories.DeserializationFormatFactory' in the classpath.

Available factory identifiers are:

canal-json
csv
debezium-json
json
maxwell-json
raw
    at org.apache.flink.table.factories.FactoryUtil.discoverFactory(FactoryUtil.java:319) ~[flink-table_2.12-1.13.1.jar:1.13.1]
    at org.apache.flink.table.factories.FactoryUtil$TableFactoryHelper.discoverOptionalFormatFactory(FactoryUtil.java:751) ~[flink-table_2.12-1.13.1.jar:1.13.1]
    at org.apache.flink.table.factories.FactoryUtil$TableFactoryHelper.discoverOptionalDecodingFormat(FactoryUtil.java:649) ~[flink-table_2.12-1.13.1.jar:1.13.1]
    at org.apache.flink.table.factories.FactoryUtil$TableFactoryHelper.discoverDecodingFormat(FactoryUtil.java:633) ~[flink-table_2.12-1.13.1.jar:1.13.1]
    at org.apache.flink.streaming.connectors.kafka.table.KafkaDynamicTableFactory.lambda$getValueDecodingFormat$2(KafkaDynamicTableFactory.java:279) ~[?:?]
    at java.util.Optional.orElseGet(Optional.java:267) ~[?:1.8.0_282]
    at org.apache.flink.streaming.connectors.kafka.table.KafkaDynamicTableFactory.getValueDecodingFormat(KafkaDynamicTableFactory.java:277) ~[?:?]
    at org.apache.flink.streaming.connectors.kafka.table.KafkaDynamicTableFactory.createDynamicTableSource(KafkaDynamicTableFactory.java:142) ~[?:?]
    at org.apache.flink.table.factories.FactoryUtil.createTableSource(FactoryUtil.java:134) ~[flink-table_2.12-1.13.1.jar:1.13.1]
    at org.apache.flink.table.planner.plan.schema.CatalogSourceTable.createDynamicTableSource(CatalogSourceTable.java:116) ~[flink-table-blink_2.12-1.13.1.jar:1.13.1]
    at org.apache.flink.table.planner.plan.schema.CatalogSourceTable.toRel(CatalogSourceTable.java:82) ~[flink-table-blink_2.12-1.13.1.jar:1.13.1]
    at org.apache.calcite.sql2rel.SqlToRelConverter.toRel(SqlToRelConverter.java:3585) ~[flink-table_2.12-1.13.1.jar:1.13.1]

following is my build.sbt:

val flinkVersion = "1.13.1"

val flinkDependencies = Seq(
  "org.apache.flink" %% "flink-scala" % flinkVersion % Provided,
  "org.apache.flink" %% "flink-streaming-scala" % flinkVersion % Provided,
  "org.apache.flink" %% "flink-connector-kafka" % flinkVersion,
  "org.apache.flink" %% "flink-clients" % flinkVersion % Provided,
  "org.apache.flink" %% "flink-table-api-scala-bridge" % flinkVersion % Provided,
  "org.apache.flink" %% "flink-table-planner-blink"  % flinkVersion % Provided,
  "org.apache.flink" % "flink-table-common"  % flinkVersion % Provided,
  "org.apache.flink" % "flink-avro-confluent-registry" % flinkVersion,
  "org.apache.flink" % "flink-json" % flinkVersion,
  "com.webtrekk" % "wd.generated" % "2.2.3",
  "com.webtrekk" % "wd.generated.public" % "2.2.0",
  "ch.qos.logback" % "logback-classic" % "1.2.3"
)

Similar issue has been posted in Flink 1.12 Could not find any factory for identifier 'kafka' that implements 'org.apache.flink.table.factories.DynamicTableFactory' in the classpath but the solution of adding provided is not working in my case.

ANSWER

Answered 2021-Oct-26 at 17:47

I was able to fix this problem using following approach:

In my build.sbt, there was the following mergeStrategy:

lazy val mergeStrategy = Seq(
  assembly / assemblyMergeStrategy := {
    case "application.conf" => MergeStrategy.concat
    case "reference.conf" => MergeStrategy.concat
    case m if m.toLowerCase.endsWith("manifest.mf") => MergeStrategy.discard
    case m if m.toLowerCase.matches("meta-inf.*\\.sf$") => MergeStrategy.discard
    case _ => MergeStrategy.first
  }
)

I appended the following chunk in it, hence resolved my exception:

case "META-INF/services/org.apache.flink.table.factories.Factory"  => MergeStrategy.concat
case "META-INF/services/org.apache.flink.table.factories.TableFactory"  => MergeStrategy.concat

Source https://stackoverflow.com/questions/69677946

QUESTION

get porper listbox item when using trace

Asked 2022-Feb-22 at 01:46

...
import tkinter
from tkinter import StringVar


adfl = ['Alan Alexander Milne', 'Alice Hoffman', 'Alicia Bay Laurel', 'Alison Weir',       'Alistair Cooke','Alycea Ungaro', 'Amanda Quick', 'Ann Durell', 'Anne De Courcy', 'Anne Kent Rush', 'Anne McCaffrey','Anne Purdy', 'Anne Rice', 'Anon', 'Antoine de Saint-Exupery', 'Anya Seton', 'Arthur Conan Doyle','Ashida Kim', 'Aubrey Beardsley', 'BBC', 'Barbara Ann Brennan', 'Barbara Walker', 'Bertrice Small','Betsy Bruce', 'C. S. Lewis', 'Caitlin Matthews', 'Carl Sagan', 'Carol Belanger Grafton', 'Carol Blackman','Carol Kisner', 'Caroline Foley', 'Carolyn Kisner', 'Catherine Coulter', 'Charles Greenstreet Addison','Charlotte Bronte', 'Chic Tabatha Cicero', 'Christina Dodd', 'Christopher Paolini', 'Clare Maxwell-Hudson','Clarissa Pinkola Estés', 'Co Spinhoven', 'D. J. Conway', 'D.H. Lawrence', 'Dan Brown','Daniel M. Mendelowitz', 'Deborah E. Harkness', 'Denise Dumars', 'Denys Hay', 'Diana Gabaldon','Diana L. Paxson', 'Dinah Lovett', 'Dion Fortune', 'Donald M. Anderson']


def update_list(*args):
    frame1_lb.delete(0, 'end')
    search_term = ent_var.get()
    for item in adfl:
        if search_term.lower() in item.lower():
            frame1_lb.insert('end', item)
    return


def author_list():
    # Clear entry box
    ent_var.set("")
    frame1.configure(text='Author')
    frame1_list.set(adfl)
    # Set up trace for list update, only need this one instance to make work
    ent_var.trace("w", update_list)
    frame1_lb.bind('<<ListboxSelect>>', sauthor_list)


def sauthor_list(self):
    caut = frame1_lb.curselection()
    print(caut)
    saut = adfl[caut[0]]
    print(saut)


##########
window = tkinter.Tk()
window.geometry("600x900")
window.resizable(width=False, height=False)
window.wm_title("My Book Library")
window.configure(bg='#5e84d4')
window.update_idletasks()
# Gets the requested values of the height and widht.
windowWidth = window.winfo_width()
windowHeight = window.winfo_height()
# Gets both half the screen width/height and window width/height
positionRight = int((window.winfo_screenwidth() / 2) - windowWidth / 2)
positionDown = int((window.winfo_screenheight() / 2) - windowHeight / 2)
# Positions the window in the center of the page.
window.geometry("+{}+{}".format(positionRight, positionDown))
# Layout of frames

frame1 = tkinter.LabelFrame(window, text='', bg='lightblue')
frame1.place(relx=0.010, rely=0.10, relheight=0.890, relwidth=0.500)
frame1.configure(relief='groove')
frame1.configure(borderwidth="2")
frame1_list = StringVar()
frame1_lb = tkinter.Listbox(frame1, listvariable=frame1_list, width=40, height=44)
frame1_lb.place(x=0.0, y=0.30)
frame1_sb = tkinter.Scrollbar(frame1, orient=tkinter.VERTICAL)
frame1_lb.config(yscrollcommand=frame1_sb.set, bg='white')
frame1_sb.pack(side=tkinter.RIGHT, fill=tkinter.Y)
frame1_sb.config(command=frame1_lb.yview)

frame1a = tkinter.LabelFrame(window, text="Enter letters  - for search")
frame1a.configure(border=2, relief='groove')
frame1a.place(relx=0.010, rely=0.05, relheight=0.05, relwidth=0.500)
ent_var = StringVar()
frame1_ent = tkinter.Entry(frame1a, textvariable=ent_var,  width=40, bg='white')
frame1_ent.place(x=0.0, rely=0.0)
search_term = ent_var.get()


author_list()
window.mainloop()
...

So, I can use the trace to get list shortened to what I want by entering into entry box. But when I click on shortened list I get the value of the position in previous list, not the new shorten list value. Works okay without using entry box, to shorten list. This was my attempt at a autocomplete listbox type.

ANSWER

Answered 2022-Feb-22 at 01:46

You use the wrong source for showing the selected item. As the shortened list is not the same as adfl, you should not use adfl inside sauthor_list(). You need to get the selected item using frame1_lb.get() instead:

def sauthor_list(self):
    caut = frame1_lb.curselection()
    print(caut)
    saut = frame1_lb.get(caut[0])  # get the selected item
    print(saut)

Source https://stackoverflow.com/questions/71213193

QUESTION

Insert colA into DF1 with vals from DF2['colB'] by matching colC in both DFs

Asked 2022-Feb-20 at 23:43

I have two CSV files, CSV_A and CSV_B.csv. I must insert the column (Category) from CSV_B into CSV_A.

The two CSVs share a common column: StockID, and I must add the correct category onto each row by matching the StockID columns.

This can be done using merge, like this:

dfa.merge(dfb, how='left', on='StockID')

but I only want to add the one column, not join the two dataframes.

CSV_A (indexed on StockID):

StockID,Brand,ToolName,Price
ABC123,Maxwell,ToolA,1.25
BCD234,Charton,ToolB,2.22
CDE345,Bingley,ToolC,3.33
DEF789,Charton,ToolD,1.44

CSV_B:

PurchDate,Supplier,StockID,Category
20201005,Sigmat,BCD234,CatShop
20210219,Zorbak,AAA111,CatWares
20210307,Phillips
20210417,Tandey,CDE345,CatThings
20210422,Stapek,BBB222,CatElse
20210502,Zorbak,ABC123,CatThis
20210512,Zorbak,CCC999,CatThings
20210717,Phillips,DEF789,CatShop

My task is to insert a Cat field into CSV_A, matching each inserted Category with its correct StockID.

Note1: CSV_A is indexed on the StockID column. CSV_B has the default indexing.
Note2: There are some columns in CSV_B (e.g. row 3) that do not have complete information. Note3: Adding column "Category" from CSV_B into CSV_A but calling it "Cat" in CSV_A

ANSWER

Answered 2022-Feb-20 at 19:37

While creating the question I discovered the solution, so decided to post it rather than just deleting the question.

import pandas as pd
dfa = pd.read_csv('csv_a.csv')
dfa.set_index('StockID', inplace=True)
dfb = pd.read_csv('csv_b.csv')

#remove incomplete rows (i.e. without Category/StockID columns)
dfb_tmp = dfb[dfb['StockID'].notnull()]

def myfunc(row):
    # NB: Use row.name because row['StockID'] is the index
    if row.name in list(dfb_tmp['StockID']):
        return dfb_tmp.loc[dfb_tmp['StockID'] == row.name]['Category'].values[0]
dfa['Cat'] = dfa.apply(lambda row: myfunc(row), axis=1)

print(dfa)

Result:

StockID Brand   ToolName    Price   Cat
ABC123  Maxwell ToolA       1.25    CatThis
BCD234  Charton ToolB       2.22    CatShop
CDE345  Bingley ToolC       3.33    CatThings
DEF789  Charton ToolD       1.44    CatShop

Source https://stackoverflow.com/questions/71198075

QUESTION

How do i populate three sections in a tableview with SwiftyJSON

Asked 2022-Jan-24 at 07:43

I want to assign records or cells for 3 sections ["Managers","Accountants","Receptionist"] where key "authority" has the validation of which section it belongs to ..

Swift code:

struct GlobalVariables {
        static var userdetailsJSON: [JSON] = [JSON.null]
        static var sectionTitles: [String] = ["Managers","Accountants","Receptionist"]
}

@IBAction func Userdb_Btn(_ sender: Any) {
        let url = "http://.../GetUsers.php"
        let headers: HTTPHeaders = ["Content-Type":"application/x-www-form-urlencoded"]
        let data:  Parameters = ["Authorization":"IOSAPP"]
        AF.request(url, method: .post, parameters: data, encoding: URLEncoding.default, headers: headers).response { response in

            switch response.result {

                       case .success:
                        let json : JSON = JSON(response.data ?? JSON.null)
                        let jsonError = json["error"].boolValue

                        if jsonError ==  false{
                            UsersdbVC.GlobalVariables.userdetailsJSON = json["userDetails"].arrayValue
                            print(UsersdbVC.GlobalVariables.userdetailsJSON)
                        }else{
                            self.displayAlert(title: "Failed to load users data !", message:"")
                        }

                       case .failure(let error):
                        self.displayAlert(title: "Connection error", message: "\(error)")
            }
        }
   }

Here is my Json output:

[{
  "name" : "Oliver",
  "password" : "1234",
  "username" : "Ramy",
  "id" : 84560,
  "authority" : "Manager"
}, {
  "name" : "Maxwell",
  "password" : "1234",
  "username" : "Omar",
  "id" : 84561,
  "authority" : "Accountant"
}, {
  "name" : "Tom",
  "password" : "1234",
  "username" : "Ahmed",
  "id" : 84562,
  "authority" : "Accountant"
}]

Number of sections could be identified by :

func numberOfSections(in tableView: UITableView) -> Int {
return GlobalVariables.sectionTitles.count}

but how could we populate records for each section by validating itself from key "authority" .. ? let me explain, i should see in tableview as follows:

Section: Manager
Cell: ID: 84560 - Oliver

Section: Accountant
Cell: ID:84561 - Maxwell
Cell: ID:84562 - Tom

Section: Receptionist
Cell: Empty...

just like filtering or sorting by authority... Although, the following code populates the records but the same for each section... CellForRowAt:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "usersTVC", for: indexPath)
        let userID: String = GlobalVariables.userdetailsJSON[indexPath.row]["id"].stringValue
        let userName: String = GlobalVariables.userdetailsJSON[indexPath.row]["name"].stringValue
        cell.textLabel?.text = "ID: \(userID) - \(userName)"
       return cell
   }

numberOfRowsInSection:

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return GlobalVariables.userdetailsJSON[section]["authority"].count
   }

Any help would be appreciated !

ANSWER

Answered 2022-Jan-24 at 07:43

Forget SwiftyJSON, it's a great library but it's outdated.
And forget also a struct with static properties as data source.

Decode the JSON with Decodable – AlamoFire does support it – and group the array with Dictionary(grouping:by:) into sections.

First create two structs, a struct for the sections and one for the items (User in the following example)

struct Section {
    let name : String
    let users : [User]
}

struct User : Decodable {
    let name, password, username, authority : String
    let id : Int
}

This is a standalone solution without AF, create a data source array

var sections = [Section]()

Decode the JSON

let jsonString = """
[{
  "name" : "Oliver",
  "password" : "1234",
  "username" : "Ramy",
  "id" : 84560,
  "authority" : "Manager"
}, {
  "name" : "Maxwell",
  "password" : "1234",
  "username" : "Omar",
  "id" : 84561,
  "authority" : "Accountant"
}, {
  "name" : "Tom",
  "password" : "1234",
  "username" : "Ahmed",
  "id" : 84562,
  "authority" : "Accountant"
}]
"""

do {
    let users = try JSONDecoder().decode([User].self, from: Data(jsonString.utf8))
    let grouped = Dictionary(grouping: users, by: \.authority)
    sections = grouped.map(Section.init)
    
    print(sections)
} catch {
    print(error)
}

The data source methods are

func numberOfSections(in tableView: UITableView) -> Int {
    return sections.count
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return sections[section].users.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "usersTVC", for: indexPath)
    let user = sections[indexPath.section].users[indexPath.row]
    cell.textLabel?.text = "ID: \(user.id) - \(user.name)"
    return cell
}

Update: To decode the JSON with Alamofire use

AF.request(url, method: .post, parameters: data, headers: headers).responseDecodable(of: [User].self, decoder: JSONDecoder()) { response in
    switch response.result {
        case .success(let users): 
           let grouped = Dictionary(grouping: users, by: \.authority)
           sections = grouped.map(Section.init)
        case .failure(let error): print(error)

Source https://stackoverflow.com/questions/70826298

QUESTION

how to fix template does not exist in Django?

Asked 2022-Jan-23 at 12:46

I am a beginner in the Django framework. I created my project created my app and test it, it work fine till I decided to add a template. I don't know where the error is coming from because I follow what Django docs say by creating folder name templates in your app folder creating a folder with your app name and lastly creating the HTML file in the folder.

NOTE: other routes are working fine except the template

Please view the screenshot of my file structure and error below. File Structure

ERROR

    TemplateDoesNotExist at /blog/
 Blog/index
Request Method: GET
Request URL:    http://127.0.0.1:8000/blog/
Django Version: 4.0.1
Exception Type: TemplateDoesNotExist
Exception Value:    
 Blog/index
Exception Location: C:\Python39\lib\site-packages\django\template\loader.py, line 19, in get_template
Python Executable:  C:\Python39\python.exe
Python Version: 3.9.4
Python Path:    
['C:\\Users\\Maxwell\\Desktop\\Django\\WebApp',
 'C:\\Python39\\python39.zip',
 'C:\\Python39\\DLLs',
 'C:\\Python39\\lib',
 'C:\\Python39',
 'C:\\Users\\Maxwell\\AppData\\Roaming\\Python\\Python39\\site-packages',
 'C:\\Python39\\lib\\site-packages',
 'C:\\Python39\\lib\\site-packages\\win32',
 'C:\\Python39\\lib\\site-packages\\win32\\lib',
 'C:\\Python39\\lib\\site-packages\\Pythonwin']
Server time:    Sun, 23 Jan 2022 12:04:18 +0000
Template-loader postmortem
Django tried loading these templates, in this order:

Using engine django:

django.template.loaders.app_directories.Loader: C:\Users\Maxwell\Desktop\Django\WebApp\Blog\templates\ Blog\index (Source does not exist)
django.template.loaders.app_directories.Loader: C:\Python39\lib\site-packages\django\contrib\admin\templates\ Blog\index (Source does not exist)
django.template.loaders.app_directories.Loader: C:\Python39\lib\site-packages\django\contrib\auth\templates\ Blog\index (Source does not exist)

App/views.py

from django.http import HttpResponse
from django.shortcuts import render

# Create your views here.

def index(request,name):
    return HttpResponse(f'Hello {name}')

def html(request):
    return render(request,' Blog/index.html')

ANSWER

Answered 2022-Jan-23 at 12:31

It seems that you render the template with Blog/index, but you need to specify the entire file name, so Blog/index.html and without a leading (or trailing) space:

def html(request):
    return render(request, 'Blog/index.html')

Source https://stackoverflow.com/questions/70822030

QUESTION

Collect similar terms in sympy

Asked 2022-Jan-19 at 14:27

I'm solving the Maxwell Garnett equation with SymPy:

solveset(Eq((e-m)/(e+2*m) = n*(a-m)/(a+2*m)), m)

Is it possible to simplify the solution by grouping similar terms together like Mathematica does?

The closest recipe I've found is SymPy: How to collect multi-variable terms?, but it is not directly applicable here.

I've progressed as far as: But how do I get to the even more compact form?

ANSWER

Answered 2022-Jan-19 at 09:55

It is possible to call collect and give it a function that should apply to the coefficients after collection and so we can use factor to factorise the coefficients:

In [2]: e, a, m, n = symbols('e, a, m, n')

In [3]: sol = solveset(Eq((e-m)/(e+2*m), n*(a-m)/(a+2*m)), m)

In [4]: s1, s2 = sol.args[0]

In [5]: s1
Out[5]: 
                           _____________________________________________________________________________
                          ╱    2  2      2      2          2                       2  2      2        2 
2⋅a⋅n + a - e⋅n - 2⋅e   ╲╱  4⋅a ⋅n  + 4⋅a ⋅n + a  + 4⋅a⋅e⋅n  - 26⋅a⋅e⋅n + 4⋅a⋅e + e ⋅n  + 4⋅e ⋅n + 4⋅e  
───────────────────── - ────────────────────────────────────────────────────────────────────────────────
      4⋅(n - 1)                                            4⋅(n - 1)                                    

In [6]: s1.collect(e, lambda c: c.factor() if c.is_polynomial() else c)
Out[6]: 
                              _______________________________________________________
                             ╱  2          2         ⎛   2           ⎞    2        2 
a⋅(2⋅n + 1) + e⋅(-n - 2)   ╲╱  a ⋅(2⋅n + 1)  + 2⋅a⋅e⋅⎝2⋅n  - 13⋅n + 2⎠ + e ⋅(n + 2)  
──────────────────────── - ──────────────────────────────────────────────────────────
       4⋅(n - 1)                                   4⋅(n - 1)                         

In [7]: s2.collect(e, lambda c: c.factor() if c.is_polynomial() else c)
Out[7]: 
                              _______________________________________________________
                             ╱  2          2         ⎛   2           ⎞    2        2 
a⋅(2⋅n + 1) + e⋅(-n - 2)   ╲╱  a ⋅(2⋅n + 1)  + 2⋅a⋅e⋅⎝2⋅n  - 13⋅n + 2⎠ + e ⋅(n + 2)  
──────────────────────── + ──────────────────────────────────────────────────────────
       4⋅(n - 1)                                   4⋅(n - 1)

The is_polynomial check is to stop collect from applying factor to the final expression after it is done recursing subexpressions (a final call to factor expands everything again). There might be a better check that could be used for more general situations.

Source https://stackoverflow.com/questions/70767745

QUESTION

D3.js style and class override not work as my expectation

Asked 2022-Jan-15 at 17:14

May I know why my class "bold-header" styles didn't override to the first row<tr> of the table?

HTML:

<style>
    .bold-header{
        background-color:navy;
        color:white;
    }
</style>

<table border="1">
    <tr>
        <td>ID</td>
        <td>Name</td>
    </tr>
    <tr>
        <td>001</td>
        <td>John</td>
    </tr>
    <tr>
        <td>002</td>
        <td>Alex</td>
    </tr>
    <tr>         
        <td>003</td>
        <td>Maxwell</td>
    </tr>
</table>

Script:

d3.select("table").selectAll("td").style("background-color", "lightblue").style("width", "100px");

d3.select("table").select("tr").classed("bold-header", true);

I expect this result: my expectation

but it gave me this: actual result

ANSWER

Answered 2022-Jan-15 at 17:14

The background color is not working because we need to set background color on <td> element of first row. In your code, you are not selected corresponding td's.

The following changes are needed in second line of JS code:

d3.select("table").select("tr").selectAll("td").classed("bold-header", true);

UPDATE

I have understood the question and have updated the code, the another reason that your code is not working because you lightblue color is overriding the navy color. So, I would suggest you to select the header td tags and body td tags wisely. Please see the working code below

d3.select("table").selectAll("tr:not(:first-child)").style("background-color", "lightblue").style("width", "100px");

d3.select("table").select("tr").classed("bold-header", true);

 .bold-header{
        background-color:navy;
        color:white;
    }

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<table border="1">
    <tr>
        <td>ID</td>
        <td>Name</td>
    </tr>
    <tr>
        <td>001</td>
        <td>John</td>
    </tr>
    <tr>
        <td>002</td>
        <td>Alex</td>
    </tr>
    <tr>         
        <td>003</td>
        <td>Maxwell</td>
    </tr>
</table>

Source https://stackoverflow.com/questions/70720367

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Install maxwell

You can download it from GitHub, Maven.
You can use maxwell like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the maxwell component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

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