ballerinax/java.jdbc Ballerina library

Package overview

This package provides the functionality required to access and manipulate data stored in any type of relational database that is accessible via Java Database Connectivity (JDBC).

Prerequisite: Add the JDBC driver corresponding to the database you are trying to interact with as a native library dependency in your Ballerina project. Then, once you build the project by executing the ballerina build command, you should be able to run the resultant by executing the ballerina run command.

E.g., The Ballerina.toml content. Change the path to the JDBC driver appropriately.

[package]
org = "sample"
name = "jdbc"
version= "0.1.0"

[[platform.java11.dependency]]
artifactId = "h2"
version = "1.4.200"
path = "/path/to/com.h2database.h2-1.4.200.jar"
groupId = "com.h2database"

Client

To access a database, you must first create a jdbc:Client object. The examples for creating a JDBC client can be found below.

Creating a client

This example shows the different ways of creating the jdbc:Client. The client can be created by passing the JDBC URL, which is a mandatory property and all other fields are optional.

The dbClient1 receives only the database URL and the dbClient2 receives the username and password in addition to the URL. If the properties are passed in the same order as it is defined in the jdbc:Client, you can pass it without named params.

The dbClient3 uses the named params to pass all the attributes and provides the options property in the type of jdbc:Options and also uses the unshared connection pool in the type of sql:ConnectionPool. For more information about connection pooling, see SQL Package.

The dbClient4 receives some custom properties within the jdbc:Options and those properties will be used by the defined datasourceName. As per the provided example, the org.h2.jdbcx.JdbcDataSource datasource will be configured with a loginTimeout of 2000 milli seconds.

jdbc:Client|sql:Error dbClient1 = new ("jdbc:h2:~/path/to/database");
jdbc:Client|sql:Error dbClient2 = new ("jdbc:h2:~/path/to/database", 
                            "root", "root");
jdbc:Client|sql:Error dbClient3 = new (url =  "jdbc:h2:~/path/to/database",
                             user = "root", password = "root",
                             options = {
                                 datasourceName: "org.h2.jdbcx.JdbcDataSource"
                             },
                             connectionPool = {
                                 maxOpenConnections: 5
                             });
jdbc:Client|sql:Error dbClient4 = new (url =  "jdbc:h2:~/path/to/database", 
                             user = "root", password = "root",
                             options = {
                                datasourceName: "org.h2.jdbcx.JdbcDataSource", 
                                properties: {"loginTimeout": "2000"}
                             });

You can find more details about each property in the jdbc:Client constructor.

The jdbc:Client references sql:Client and all the operations defined by the sql:Client will be supported by the jdbc:Client as well.

For more information on all the operations supported by the jdbc:Client, which include the below, see the SQL Package.

1. Connection Pooling
2. Querying data
3. Inserting data
4. Updating data
5. Deleting data
6. Batch insert and update data
7. Execute stored procedures
8. Closing client

For examples on the usage of the connector, see the following.

• Client Initialization Example
• Select Query Operations Example
• Query with Complex Types Example
• DDL and DML Operations Example
• Batch Execute Operations Example
• Parameterized Query Example