sql2o | small library , which makes it easy to convert the result | SQL Database library
kandi X-RAY | sql2o Summary
kandi X-RAY | sql2o Summary
Sql2o is a small java library, with the purpose of making database interaction easy. When fetching data from the database, the ResultSet will automatically be filled into your POJO objects. Kind of like an ORM, but without the SQL generation capabilities. Sql2o requires at Java 7 or 8 to run. Java versions past 8 may work, but is currently not supported.
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Top functions reviewed by kandi - BETA
- Execute the update
- Sort array parameters
- Build a prepared statement
- Updates the query string to replace with array parameters
- Create a new ResultSetHandler
- Convert a underscore to lower case
- Get the setter for the property path
- Sets the value of a property
- New ResultSet handler
- Sets the column mappings
- Convert a value to a UUID
- Collects all available properties of a class and returns a map of readable properties
- Fill default converters
- Returns the next element
- Creates a new object constructor
- Binds parameters to a POJO
- Parse a single parameter
- Parses the given SQL statement
- Get a JNDI datasource
- Convert a value to a JSON element
- Initialize the property and setters
- Parse a single character
- Parse the comment
- Convert an object to a value
- Factory method to create a new converter instance
- Convert a value to a Boolean
sql2o Key Features
sql2o Examples and Code Snippets
Community Discussions
Trending Discussions on sql2o
QUESTION
Is there a way to execute Serenity Screenplay tests via CLI?
I've tried to issue the mvn test -Dcucumber.options="list of test files" command but Maven is not executing anything.
Currently, this is the main class that I have under src/test/java
ANSWER
Answered 2020-Feb-04 at 16:10Eventually I discovered that I had first to setup the Failsafe plugin, and then make it communicate with the CucumberMain class. Then, from the CLI, executing either mvn verify or mvn test with the list of tests that I want to execute made the trick
QUESTION
I have a project in which I'm working that it is made, among everything, with Java 11+Spring Boot+Gradle.
All of a sudden, when I press play on IntelliJ Idea Ultimate 2019.3 I'm getting the following error.
ANSWER
Answered 2020-Jan-10 at 14:40Given the lack of logging output, you may have a problem with some logging related dependencies. For example, a dependency on commons-logging:commons-logging can cause problems and should be excluded in favour of org.springframework:spring-jcl. org.slf4j:jcl-over-slf4j should be treated similarly.
You can learn if you have either of these dependencies on the classpath using Gradle's dependencyInsight task:
QUESTION
I have the following method to modify a user in my Postgres database:
...ANSWER
Answered 2019-Mar-13 at 13:51Don't know the exact reason why, but the problem was in
QUESTION
using sql2o (https://github.com/aaberg/sql2o)
when selecting a VARCHAR column that has trailing spaces (for example "some value ") the return value is "some value"
when selecting from mysql cli the result contains the trailing spaces
cant find any documentation how to prevent this from happening
- table:
ANSWER
Answered 2019-May-09 at 20:05Think I found your answer in Sql2o.
I believe by using String.class, it is using the StringConverter class to convert your query output into a string. At the very bottom of the StringConverter class is this line:
QUESTION
Our team are using Spring Boot 2 with sql2o as db library. In the paste in our services, for trivial methods, we simply call the repository and returns the model. For example, if I have a Supplier table, I had in the service
...ANSWER
Answered 2019-Apr-29 at 22:37In the end, I adopted the suffix Aggregator, following the Domain-driven design wording.
QUESTION
I am trying to understand why my checkstyle rule is not being respected by Maven and am getting the error: src\main\java\com\jon\ttf\adapter\persistence\BaseSqlPersistence.java:[4,1] (imports) ImportControl: Disallowed import - org.sql2o.Sql2o. I have removed most of the code in import-control-error.xml as they are all very similar. Could the problem be somewhere in checkstyle-checks.xml where a certain check is over riding my org.sql2o.Sql2o package?
Let me know if you want me to attach more code
import-control-error.xml
...ANSWER
Answered 2019-Feb-08 at 22:09am getting the error: BaseSqlPersistence.java:[4,1] (imports) ImportControl: Disallowed import - org.sql2o.Sql2o
import-control-error.xml
QUESTION
public Connection executeUpdate() {
long start = System.currentTimeMillis();
try {
this.logExecution();
PreparedStatement statement = this.buildPreparedStatement();
this.connection.setResult(statement.executeUpdate());
this.connection.setKeys(this.returnGeneratedKeys ? statement.getGeneratedKeys() : null);
this.connection.setCanGetKeys(this.returnGeneratedKeys);
} catch (SQLException var7) {
this.connection.onException();
throw new Sql2oException("Error in executeUpdate, " + var7.getMessage(), var7);
} finally {
this.closeConnectionIfNecessary();
}
long end = System.currentTimeMillis();
logger.debug("total: {} ms; executed update [{}]", new Object[]{end - start, this.getName() == null ? "No name" : this.getName()});
return this.connection;
}
ANSWER
Answered 2019-Jan-15 at 16:28I went and RTFM which explained how to do this.
QUESTION
Straight to the point, I've tried searching on google and on SO but cant find what I'm looking for. It could be because of not wording my searching correctly.
My question is,
I have a couple of tables which will be holding anywhere between 1,000 lines to 100,000 per year. I'm trying to figure out, do I/ how should I handle archiving the data? I'm not well experienced with databases, but below are a few method's I've came up with and I'm unsure which is a better practice. Of course taking into account performance and ease of coding. I'm using Java 1.8, Sql2o and Postgres.
Method 1
Archive the data into a separate database every year.
I don't really like this method because when we want to search for old data, our application will need to search into a different database and it'll be a hassle for me to add in more code for this.
Method 2
Archive the data into a separate database for data older than 2-3 years.
And use status on the lines to improve the performance. (See method 3) This is something I'm leaning towards as an 'Optimal' solution where the code is not as complex to do but also keeps by DB relatively clean.
Method 3 Just have status for each line (eg: A=active, R=Archived) to possibly improving the performance of the query. Just having a "select * from table where status = 'A' " to reduce the the number of line to look through.
...ANSWER
Answered 2018-Sep-18 at 09:32100,000 rows per year is not that much. [1]
There's no need to move that to a separate place. If you already have good indexes in place, you almost certainly won't notice any degraded performance over the years.
However, if you want to be absolutely sure, you could add a year column and create an index for that (or add that to your existing indexes). But really, do that only for the tables where you know you need it. For example, if your table already has a date column which is part of your index(es), you don't need a separate year column.
[1] Unless you have thousands of columns and/or columns that contain large binary blobs - which doesn't seems to be the case here.
QUESTION
I have a Sparkjava app which I have deployed on a Tomcat server. It uses SQL2O to interface with the MySQL-database. After some time I start to have trouble connecting to the database. I've tried connecting directly from SQL2O, connecting through HikariCP and connecting through JNDI. They all work for about a day, before I start getting Communications link failure. This app gets hit a handful of times a day at best, so performance is a complete non issue. I want to configure the app to use one database connection per request. How do I go about that?
The app doesn't come online again afterwards until I redeploy it (overwrite ROOT.war again). Restarting tomcat or the entire server does nothing.
Currently every request creates a new Sql2o object and executes the query using withConnection. I'd be highly surprised if I was leaking any connections.
Here's some example code (simplified).
...ANSWER
Answered 2018-Feb-22 at 19:00If you rely on Tomcat to provide the connection to you: It's coming from a pool. Just go with plain old JDBC and open that connection yourself (and make sure to close it as well) if you don't like that.
So much for the answer to your question, to the letter. Now for the spirit: There's nothing wrong with connections coming from a pool. In all cases, it's your responsibility to handle it properly: Get access to a connection and free it up (close) when you're done with it. It doesn't make a difference if the connection is coming from a pool or has been created manually.
As you say performance is not an issue: Note that the creation of a connection may take some time, so even if the computer is largely idle, creating a new connection per request may have a notable effect on the performance. Your server won't overheat, but it might add a second or two to the request turnaround time.
Check configurations for your pool - e.g. validationQuery (to detect communication failures) or limits for use per connection. And make sure that you don't run into those issues because of bugs in your code. You'll need to handle communication errors anyways. And, again, that handling doesn't differ whether you use pools or not.
Edit: And finally: Are you extra extra sure that there indeed is no communication link failure? Like: Database or router unplugged every night to connect the vacuum cleaner? (no pun intended), Firewall dropping/resetting connections etc?
QUESTION
I'm trying to get data from mySQL to List in java using sql2o lib.
But for some reason I just fail to understand how to use it properly (it looks like).
Here is the faulty code:
...ANSWER
Answered 2018-Feb-09 at 09:46I think you misunderstand what column mappings are. Column mappings are used to map column names to object-field names.
You should first create a data class to hold the result of your query. From your code above, I assume that you are trying to fetch players.
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Install sql2o
You can use sql2o 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 sql2o 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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