halo-dal | java 分布式数据库访问框架,可以结合任何使用PreparedStatement操作的框架。在java jdbc | DB Client library

 by   akwei Java Version: Current License: No License

kandi X-RAY | halo-dal Summary

kandi X-RAY | halo-dal Summary

halo-dal is a Java library typically used in Utilities, DB Client, Spring Boot, Spring, Maven, JavaFX, Hibernate applications. halo-dal has no bugs, it has no vulnerabilities, it has build file available and it has low support. You can download it from GitHub.

#halo-dal使用说明 #####使用场景:数据库分布式访问 #####使用语言:java #####使用条件:支持PreparedStatement处理的任何jdbc框架,最好配合spring管理数据库连接池. #####sql语句必须使用小写字符 #####jdk版本:jdk1.5以及以上版本 #####请使用spring管理数据库连接池 #####项目依赖jar:commons-lang3-3.1.jar, commons-logging.jar,junit-4.10.jar(单元测试使用) #####examplelib目录下的jar为例子中使用的jar #####springexamplelib目录下的jar为spring例子中使用的jar #####使用hibernate时,请设置 hibernate.temp.use_jdbc_metadata_defaults=false. #支持功能: #####1, jdbc PreparedStatement #####2, 数据库分库分表访问,支持insert delete update select #####3, 单数据库事务 #####4, 多数据库分步提交事务 #####5, 读写分离 #####6, 编程指定数据源和表 #####7, 缓存sql结构. #不支持功能: #####1, jdbc Statement访问. (使用 Statement访问时,不会进行sql的分表分库的解析,最终执行的sql是没有解析的) #####2, 不支持 (column_name)=? 对column_name加"()" #####5, sql中不支持 in(?,?,?)这种使用in 的预处理语句 #####6, 分布式事务 #####7, 不支持与同一张表进行join查询. ##不喜欢看以下说明,可以直接看example下的例子 Insert.java Update.java Delete.java Select.java. #重要说明 在使用sequenece作为id时,请求sequenece的sql语句是没有任何库表信息的。因此会抛出dsKey 为null 的异常。因此在使用时,请先使用其他方式获得最新id。 不在分表分库的操作中首先使用sequence操作。.
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            kandi-support Support

              halo-dal has a low active ecosystem.
              It has 84 star(s) with 56 fork(s). There are 14 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 3 open issues and 0 have been closed. On average issues are closed in 2641 days. There are 6 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of halo-dal is current.

            kandi-Quality Quality

              halo-dal has no bugs reported.

            kandi-Security Security

              halo-dal has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              halo-dal does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              OutlinedDot
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              halo-dal releases are not available. You will need to build from source code and install.
              Build file is available. You can build the component from source.
              Installation instructions are not available. Examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed halo-dal and discovered the below as its top functions. This is intended to give you an instant insight into halo-dal implemented functionality, and help decide if they suit your requirements.
            • Find tokens
            • Getter for TEXT_STRING
            • Reserved for ROWNBER
            • Getter for BASIC_NAME
            • Parse SQL
            • Resolve groupby
            • Getter for SQL_select
            • CRV
            • Analyze sql
            • Get SQL expressions for given column name
            • Adds a SQL expression
            • Parse and return SQL struct
            • Resolve q
            • Match
            • Checks if is key value
            • Initialize with column name
            • Get parser by key
            • Get PartitionParser by key
            • Resolve the sql_sql_wrapper
            • Produce SQL statements for output
            • Getter for zz
            Get all kandi verified functions for this library.

            halo-dal Key Features

            No Key Features are available at this moment for halo-dal.

            halo-dal Examples and Code Snippets

            No Code Snippets are available at this moment for halo-dal.

            Community Discussions

            QUESTION

            Closing MongoClient connection on exit when using MongoDB Native driver?
            Asked 2022-Apr-07 at 09:49

            Should the MongoClient connection be closed every time the server shuts down?

            I have seen the following code snippet and wanted to know if this is actually valid and should be done or if it's completely unnecessary to perform a closing on exit:

            ...

            ANSWER

            Answered 2022-Apr-07 at 09:49

            Should the MongoClient connection be closed every time the server shuts down?

            Yes, it is a good practice to close the connection. As for every connection, mongo DB does assign a thread for its execution. If you won't close it, it keeps using the resources on the DB server.

            Node.js connections use the pool to connect to DB and it can be reused while it is not being used, but it is good practice to close the connection if you are exiting the script as it won't close the connection automatically.

            Source https://stackoverflow.com/questions/71779732

            QUESTION

            Bypassing Firestore Security Rules in jest tests
            Asked 2022-Mar-24 at 08:37

            Currently working on a React/Typescript/Firebase Firestore project. When writing Jest-tests for some actions/functions that are called from the UI, I ran into the following problem:

            In the test file I'm able to setup the firestore client using the v9 api and make it talk to emulator

            ...

            ANSWER

            Answered 2022-Mar-24 at 08:37

            Thanks for confirming that I was looking in the right place (i.e. @firebase/rules-unit-testing). Finally figured out what the problem was, missed an "await" in createCompanyAndRating, so the firestore admin instance wasn't getting the data (and I though it was a admin config issue...) Thanks!

            Source https://stackoverflow.com/questions/71565485

            QUESTION

            How to use condition and multiple steps in a reactive function
            Asked 2022-Mar-16 at 08:22

            I'm currently building a reactive app using kotlin quarkus and mutiny, being new to reactive programming i wonder what's the best way to handle the following workflow :

            • try to find an item in the database (dynamodb)
            • if it exists return a value indicating this to the caller
            • if it does not exists call the save service
            • call an external service to get some data
            • update the item in database with those data from the external service
            • return a value indicating that the object has been created

            Here's my code for now :

            ...

            ANSWER

            Answered 2022-Mar-16 at 08:22

            I don't believe your code does what you expect. If I understand correctly you need to "save" and "update" before emitting your result. So, you need something like (in Java, as my Kotlin is not great):

            Source https://stackoverflow.com/questions/71410979

            QUESTION

            WordPress Nginx Configuration - GoDaddy Managed WP
            Asked 2022-Mar-01 at 22:02
            Some of the other post are helpful but only after I get help on my post.

            _Managed WP, GoDaddy _Tools available: in GD: "File Browser", "phpMyAdmin" (takes me to a URL UI). _phpMyAdmin:

            • Has things like "Databases" "Status" "Ex/Import" "Variables" "Charsets" "Engines".
            • Left tab has info_schema & server/site id in a drop down menu setup. One drop per item (schema & site/server). Two hierarchies.
            • A console/terminal
            DB server Percona & Web server nginx/1.18.0
            • db client libmysql - mysqlnd 7.4.16
            Problem
            • I don't know how to control the webserver. I am trying to setup multisite network. Currently testing/configuring pretty permalinks. Instructions unclear. Can't find GoDaddy docs on server interaction. Console in phpMyAdmin only sends SQL queries, totally not helpful. This documentation assumes I am big-brain Dev.
            • states

            However, we can set our really cool permalink configuration directly by editing Nginx. We will use try_files directive so WordPress can start using pretty permalinks. Let’s see the configuration for WordPress installed on the root of your domain, and also on a directory called /blog

            WordPress Nginx Configuration for root installations

            Search for the location / block inside nginx configuration and add the following line inside:

            ...

            ANSWER

            Answered 2021-Dec-07 at 08:55

            Problem solved! There is a reason so many online articles talk about Apache and few talk about nginx (concerning GoDaddy, Managed WordPress, Multisite Network Install). The reason is because A) Managed WordPress from G-Diddy is incompatible with Multi-site Network installation. Why? The parts of the server and the control over directories needed to achieve Multisite Network install are x) not accessible x) non-existent do to lack of tools (this is why the monthly cost is lower). {I keep mentioning Multisite Network, that was the end-goal; Pretty Permalinks setup was a prerequisite to Multi-site). B) All Managed WordPress offers from GDiddy come with nginx so: no Apache, meaning !no!htaccess.php file exist! C) No Apache also means no cPanel, meaning, a bunch of other s**t doesn't exist too...

            Resolution:
            • Upgraded to "WordPress with cPanel" (this is delivered on a Linux box, with Apache webserver + cPanel).

            Be sure to check my next post which is already halfway to a self answer but I don't believe I will be able to fully answer it so the need to post (and partially) self answer is not just so I can pat my own back, still need big time help!

            Source https://stackoverflow.com/questions/70209474

            QUESTION

            Check if user input exist in database using php and mongodb
            Asked 2022-Feb-11 at 07:04

            I want to check first if the email exists then check the password but I only want to use PHP and MongoDB not any other language or tool because I'm just a beginner.

            when I enter an input the page change to an empty page and nothing happen. I know my error is from the line of the array $findemail and downward.

            am I using the $cursor in the right way and if so am I accessing the $findemail in the right way using $d['email'] to compare it with $email

            ...

            ANSWER

            Answered 2022-Feb-09 at 22:34

            QUESTION

            Strange behaviour insert_one mongocxx 3.6
            Asked 2022-Feb-10 at 06:49

            Working with mongocxx I am trying to retrieve the object id assigned by mongodb when I insert a new object in a collection(insert_one method), and convert this id into a string. This is the code:

            ...

            ANSWER

            Answered 2022-Feb-10 at 06:49

            The debugger is showing you the individual bytes in decimal.

            I used the mongo shell to convert these to hex, you can see that it is indeed the ObjectID you were looking for, it just looks strange in decimal

            Source https://stackoverflow.com/questions/71053504

            QUESTION

            Simplest way to override an endpoint in google guice when writing functional tests
            Asked 2022-Feb-04 at 12:02

            I have an application module that installs a DynamoDB module

            ...

            ANSWER

            Answered 2022-Feb-04 at 12:02

            Configure an EndpointConfiguration as binding and override it in TestAppModule. E.g.:

            Source https://stackoverflow.com/questions/70985961

            QUESTION

            How to bind lifetimes of Futures to fn arguments in Rust
            Asked 2022-Jan-27 at 19:43

            Im trying to write a simple run_transaction function for the Rust MongoDB Driver

            This function tries to execute a transaction through the mongo db client and retries the transaction if it encounters a retryable error

            Here is a minimum reproducible example of the function.

            ...

            ANSWER

            Answered 2022-Jan-27 at 19:43

            What you really need is something like:

            Source https://stackoverflow.com/questions/70746671

            QUESTION

            Encoding UTF8 string to latin1/iso-8859-1 with Go and MySQL
            Asked 2022-Jan-25 at 22:48

            I have a MySQL database with German "Umlaute öäü" in a table and I need to write a Go app that reads the table, encode it to ISO-8859-1 and write it to a text file.

            So far so good, but the encoding to iso-8859-1 is not working. I have tried to debug this.

            Here some details and information:

            MySQL The MySQL database is UTF8, also the table itself. Also other character sets should be fine, except the character_set_server, but I think this is not relevant here, it should be just a default for new databases as far as I know.

            When I query the database with the following SQL, I get the correct UTF8 encoded text:

            ...

            ANSWER

            Answered 2022-Jan-22 at 22:58

            After two days of completely lost, I found the root cause myself. Strange that it happened shortly after I posted the question here.

            I wanted to try a different mysql server and therefore dumped the table. And then I have seen in the dump that each field has its own character set definition which was latin1 in my case.

            So that explains why it was a strange result. I just created a correct encoded test table and it works now as expected.

            Now I have to think how I can "repair" these encodings, maybe a dump/restore will do it, but that's a another story.

            Source https://stackoverflow.com/questions/70817435

            QUESTION

            Where is routing implemented (Request routing to the different replicas) when making request to the DynamoDB server?
            Asked 2022-Jan-21 at 12:16

            DynamoDB has multiple nodes and all nodes are equal: there is no single leader. I am assuming we have a DynamoDB instance and all the data can be stored on a single node. But we have several replicas for availability and redundancy.

            So writing and reading can happen on any replica node. I am just curious, how DynamoDB client decides to which node the request should be sent? Or the application developer has to take care of this routing themselves and the DyanmoDB client simply forwards these requests to the DB node.

            If someone could explain to me where this routing happens and could point me to the code where this routing is implemented, that would be a great help?

            I am new to the DynamoDB and trying to understand how things work.

            ...

            ANSWER

            Answered 2022-Jan-21 at 12:15

            Fundamentally this is an implementation detail that AWS handles - you won't find it in your Java code.

            DynamoDB has multiple nodes and all nodes are equal: there is no single leader.

            This is a misconception, the table is split up into partitions and each partition consists of three storage nodes. For each partition a storage node is selected that is the primary contact point for writes.

            A few years ago there was an interesting talk by Jason Sorensen about the internals of DynamoDB at re:invent, you can see it on YouTube.

            To summarise it, there is a fleet of request router instances that are aware of the storage nodes and how the hashing works. The storage router selects the leader node of the partition and writes data to it. As soon as two of the storage nodes acknowledge the write, the data is considered to be persisted.

            Source https://stackoverflow.com/questions/70797491

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install halo-dal

            You can download it from GitHub.
            You can use halo-dal 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 halo-dal 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 .

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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            gh repo clone akwei/halo-dal

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            git@github.com:akwei/halo-dal.git

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