Connect to OceanBase Database by using a HikariCP connection pool

This topic introduces how to build an application by using a HikariCP connection pool, OceanBase Connector/J, and OceanBase Database. It also covers the use of the application for fundamental database operations, including table creation, data insertion, data deletion, data updating, and data query.

Download the hikaricp-oceanbase-client sample project

Prerequisites

• You have installed OceanBase Database and created an Oracle tenant.

• You have installed Java Development Kit (JDK) 1.8 and Maven.

• You have installed Eclipse.

  Note

  The tool used to run the sample code in this topic is Eclipse IDE for Java Developers (2022-03), but you can also choose a tool that suits your personal preference to run the code.

Procedure

1. Import the hikaricp-oceanbase-client project into Eclipse.
2. Obtain the URL of OceanBase Database.
3. Modify the database connection information in the hikaricp-oceanbase-client project.
4. Run the hikaricp-oceanbase-client project.

Step 1: Import the hikaricp-oceanbase-client project into Eclipse

1. Start Eclipse and choose File > Open Projects from File System.

2. In the dialog box that appears, click Directory to browse and select the project, and then click Finish.

   Note

   When you import a Maven project using Eclipse, it will automatically detect the pom.xml file in the project, download the required dependency libraries based on the described dependencies in the file, and add them to the project.

   

3. View the project.

   

Step 2: Obtain the URL of OceanBase Database

1. Contact the deployment personnel or administrator of OceanBase Database to obtain the connection string.

   Here is an example:

   obclient -hxxx.xxx.xxx.xxx -P2881 -utest_user001@oracel001 -p******
   

   For more information about the connection string, see Connect to an OceanBase Database tenant by using OBClient.

2. Fill in the URL below based on the OceanBase Database connection string.

   jdbc:oceanbase://$host:$port/$schema_name?user=$user_name&password=$password
   

   where:

   • $host specifies the IP address for connecting to OceanBase Database. For connection through OceanBase Database Proxy (ODP), use the IP address of an ODP. For direct connection, use the IP address of an OBServer node.

   • $port specifies the port for connecting to OceanBase Database. For connection through ODP, the default value is 2883, which can be customized when ODP is deployed. For direct connection, the default value is 2881, which can be customized when OceanBase Database is deployed.

   • $schema_name specifies the name of the schema to be accessed.

     Notice

     The user used to connect to the tenant must have the CREATE SESSION privilege and the CREATE TABLE, INSERT, DELETE, UPDATE, and SELECT privileges on this schema. For more information about user privileges, see Privilege types in Oracle mode.

   • $user_name specifies the tenant account. For connection through ODP, two account formats are supported: username@tenant name#cluster name and cluster name:tenant name:username. For direct connection, the username@tenant name format is supported.

   • $password specifies the password of the account.

   For more information about URL parameters in OceanBase Connector/J, see Database URL.

   Here is an example:

   jdbc:oceanbase://xxx.xxx.xxx.xxx:2881/test_schema001?user=test_user001@oracel001&password=******
   

Step 3: Modify the database connection information in the hikaricp-oceanbase-client project

Modify the database connection information in the db.properties file in the hikaricp-oceanbase-client/src/main/resources/ directory based on the information obtained in Step 2: Obtain the URL of OceanBase Database.

Here is an example:

• The IP address of the OBServer node is xxx.xxx.xxx.xxx.
• The access port is 2881.
• The name of the schema to be accessed is test_schema001.
• The tenant account is test_user001@oracle001. oracle001 is an Oracle user tenant created in OceanBase Database, and test_user001 is the username of a user in the oracle001 tenant.
• The password is ******.

Here is the sample code:

...
jdbcUrl=jdbc:oceanbase://xxx.xxx.xxx.xxx:2881/test_schema001
username=test_user001@oracle001
password=******
...

Step 4: Run the hikaricp-oceanbase-client project

1. In the project navigation view, locate and expand the src/main/java directory.

2. Right-click the Main.java file and choose Run As > Java Application.

   

3. In the console window of Eclipse, view the project logs and output results.

   

4. You can also execute the following SQL statement in OceanBase Client (OBClient) to view the results:

   obclient [SYS]> SELECT * FROM test_schema001.test_hikaricp;
   

   The return result is as follows:

   +------+-------------+
   | ID   | NAME        |
   +------+-------------+
   |    1 | test_update |
   +------+-------------+
   1 row in set
   

Project code

Click here to download the project code, which is a package named hikaricp-oceanbase-client.zip.

Decompress the package to obtain a folder named hikaricp-oceanbase-client. The directory structure is as follows:

hikaricp-oceanbase-client
├── src
│   └── main
│       ├── java
│       │   └── com
│       │       └── example
│       │           └── Main.java
│       └── resources
│           └── db.properties
└── pom.xml

Here is a breakdown of the files and directories:

• src: the root directory for storing the source code.
• main: the directory for storing the main code, including the major logic of the application.
• java: the directory for storing the Java source code.
• com: the directory for storing the Java package.
• example: the directory for storing the packages of the sample project.
• Main.java: a sample file of the main class that contains logic for table creation, data insertion, data deletion, data modification, and data query.
• resources: the directory for storing resource files, including configuration files.
• db.properties: the configuration file of the connection pool, which contains relevant database connection parameters.
• pom.xml: the configuration file of the Maven project, which is used to manage project dependencies and build settings.

Code in pom.xml

The pom.xml file is a configuration file for Maven projects, which defines the dependencies, plug-ins, and build rules of the projects. Maven is a Java project management tool that can automatically download dependencies, compile, and package the projects.

To configure the pom.xml file, perform the following steps:

1. Declare the file.

   Declare the file to be an XML file that uses XML standard 1.0 and character encoding UTF-8.

   Here is the sample code:

   <?xml version="1.0" encoding="UTF-8"?>
   

2. Configure namespaces and the POM version.

   1. xmlns: the default XML namespace for the POM, which is set to http://maven.apache.org/POM/4.0.0.
   2. xmlns:xsi: the XML namespace for XML elements prefixed with xsi, which is set to http://www.w3.org/2001/XMLSchema-instance.
   3. xsi:schemaLocation: the location of an XML schema definition (XSD) file. The value consists of two parts: the default XML namespace (http://maven.apache.org/POM/4.0.0) and the URI of the XSD file (http://maven.apache.org/xsd/maven-4.0.0.xsd).
   4. <modelVersion>: the POM version used by the POM file, which is set to 4.0.0.

   Here is the sample code:

   <project xmlns="http://maven.apache.org/POM/4.0.0"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
   
    <!-- Other configurations -->
   
   </project>
   

3. Configure basic information.

   1. <groupId>: the ID of the group to which the project belongs, which is set to com.example.
   2. <artifactId>: the name of the project, which is set to hikaricp-oceanbase-client.
   3. <version>: the project version, which is set to 1.0-SNAPSHOT.

   Here is the sample code:

       <groupId>com.example</groupId>
       <artifactId>hikaricp-oceanbase-client</artifactId>
       <version>1.0-SNAPSHOT</version>
   

4. Configure the attributes of the project source file.

   Specify maven-compiler-plugin as the compiler plug-in of Maven, and set the source code version and target code version of the compiler to Java 8. This means that the project source code is compiled by using Java 8 and the compiled bytecode is compatible with the Java 8 runtime environment. This ensures that Java 8 syntax and characteristics can be correctly processed during the compilation and running of the project.

   Note

   Java 1.8 and Java 8 are different names for the same version.

   Here is the sample code:

       <build>
           <plugins>
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-compiler-plugin</artifactId>
                   <configuration>
                       <source>8</source>
                       <target>8</target>
                   </configuration>
               </plugin>
           </plugins>
       </build>
   

5. Configure the components on which the project depends.

   1. Add the oceanbase-client dependency library for interactions with the database, and configure the following parameters:

      1. <groupId>: the ID of the group to which the dependency belongs, which is set to com.oceanbase.
      2. <artifactId>: the name of the dependency, which is set to oceanbase-client.
      3. <version>: the version of the dependency, which is set to 2.4.2.

      Note

      The following code defines that the project depends on OceanBase Connector/J V2.4.2. For more information about other versions, see OceanBase Connector/J.

      Here is the sample code:

              <dependency>
                  <groupId>com.oceanbase</groupId>
                  <artifactId>oceanbase-client</artifactId>
                  <version>2.4.2</version>
              </dependency>
      

   2. Add the HikariCP dependency library for implementing a high-performance JDBC connection pool, and configure the following parameters:

      1. <groupId>: the ID of the group to which the dependency belongs, which is set to com.zaxxer.
      2. <artifactId>: the name of the dependency, which is set to HikariCP.
      3. <version>: the version of the dependency, which is set to 3.3.1.

      Here is the sample code:

              <dependency>
                  <groupId>com.zaxxer</groupId>
                  <artifactId>HikariCP</artifactId>
                  <version>3.3.1</version>
              </dependency>
      

   3. Add the logback-classic dependency library for log recording and management, and configure the following parameters:

      1. <groupId>: the ID of the group to which the dependency belongs, which is set to ch.qos.logback.
      2. <artifactId>: the name of the dependency, which is set to logback-classic.
      3. <version>: the version of the dependency, which is set to 1.2.5.

      Here is the sample code:

              <dependency>
                  <groupId>ch.qos.logback</groupId>
                  <artifactId>logback-classic</artifactId>
                  <version>1.2.5</version>
              </dependency>
      

Code in db.properties

db.properties is a sample configuration file of the connection pool. The configuration file contains the URL, username, and password for connecting to the database, and other optional parameters of the connection pool.

To configure the db.properties file, perform the following steps:

1. Configure database connection parameters.

   1. Specify the URL for connecting to the database, including the host IP address, port number, and schema to be accessed.
   2. Specify the username for connecting to the database.
   3. Specify the password for connecting to the database.

   Here is the sample code:

   jdbcUrl=jdbc:oceanbase://$host:$port/$schema_name
   username=$user_name
   password=$password
   

   where

   • $host specifies the IP address for connecting to OceanBase Database. For connection through ODP, use the IP address of an ODP. For direct connection, use the IP address of an OBServer node.
   • $port specifies the port for connecting to OceanBase Database. For connection through ODP, the default value is 2883, which can be customized when ODP is deployed. For direct connection, the default value is 2881, which can be customized when OceanBase Database is deployed.
   • $schema_name specifies the name of the schema to be accessed.
   • $user_name specifies the tenant account. For connection through ODP, two account formats are supported: username@tenant name#cluster name and cluster name:tenant name:username. For direct connection, the username@tenant name format is supported.
   • $password specifies the password of the account.

2. Configure other connection pool parameters.

   1. Enable caching for precompiled SQL statements.
   2. Set the cache size for precompiled SQL statements to 250.
   3. Set the maximum lifetime of connections to 1,800,000 ms (30 minutes). Connections exceeding the specified lifetime are closed.
   4. Set the timeout value of idle connections to 600,000 ms (10 minutes). Connections that have been idle for the specified period of time are closed.
   5. Set the timeout value for requesting a connection to 30,000 ms (30s). If no connection is obtained when the specified timeout value expires, an exception is thrown.

   Here is the sample code:

   dataSource.cachePrepStmts=true
   dataSource.prepStmtCacheSize=250
   dataSource.maxLifetime=1800000
   dataSource.idleTimeout=600000
   dataSource.connectionTimeout=30000
   

The following table describes the general parameters of a HikariCP connection pool.

Code in Main.java

The Main.java file is a part of the sample application. It demonstrates the process of obtaining a database connection from the HikariCP connection pool, executing a series of database operations, such as table creation, data insertion, data deletion, data modification, and data query, and returning the query result.

To configure the Main.java file, perform the following steps:

1. Import the required classes and packages.

   1. Define the name of the Java package as com.example, where the package is used for organizing and managing Java classes.
   2. Import the java.sql.Connection class for establishing and managing connections with the database.
   3. Import the java.sql.PreparedStatement class for executing precompiled SQL statements.
   4. Import the java.sql.ResultSet class for processing query result sets.
   5. Import the java.sql.SQLException class for handling SQL exceptions.
   6. Import the HikariConfig class for configuring HikariCP connection pools.
   7. Import the HikariDataSource class for creating and managing HikariCP connection pools.

   Here is the sample code:

   package com.example;
   
   import java.sql.Connection;
   import java.sql.PreparedStatement;
   import java.sql.ResultSet;
   import java.sql.SQLException;
   import com.zaxxer.hikari.HikariConfig;
   import com.zaxxer.hikari.HikariDataSource;
   

2. Define class names and methods.

   Define a Main class. The main method serves as the entry to the application. Call the main method to read the db.properties file to configure the HikariCP connection pool and request database connections. Then, call a series of methods in sequence to create a table, insert data, query data, update data, and delete data. If an SQLException occurs during the operation, the stack trace of the exception is recorded. To do this, perform the following steps:

   1. Define a public class named Main.
   2. Define an entry method named main of the Main class.
   3. Create a HikariConfig object and configure the object based on the db.properties file.
   4. Create a HikariDataSource object and obtain a database connection by using the try-with-resources block.
   5. Call the table creation method and pass in the obtained database connection object to create a table named test_hikaricp.
   6. Call the data insertion method and pass in the obtained database connection object and data parameters to insert the (1,'A1') and (2,'A2') records.
   7. Call the data query method and pass in the obtained database connection object to query the inserted data.
   8. Call the data update method and pass in the obtained database connection object and update parameters to update the name column value of the row whose id value is 1 to test_update.
   9. Call the data query method and pass in the obtained database connection object to query the updated data.
   10. Call the data deletion method and pass in the obtained database connection object and deletion parameters to delete the row whose id value is 2.
   11. Call the data query method and pass in the obtained database connection object to query the data after the deletion.
   12. If an SQLException occurs in the try block, the stack trace of the exception is recorded.
   13. Define methods for creating tables, inserting data, querying data, updating data, and deleting data.

   Here is the sample code:

   public class Main {
       public static void main(String[] args) {
           try {
               HikariConfig config = new HikariConfig("/db.properties");
               try (HikariDataSource dataSource = new HikariDataSource(config);
                   Connection conn = dataSource.getConnection()) {
                   createTable(conn);
   
                   insertData(conn, 1, "A1");
                   insertData(conn, 2, "A2");
   
                   selectData(conn);
   
                   updateData(conn, "test_update", 1);
                   selectData(conn);
   
                   deleteData(conn, 2);
                   selectData(conn);
               }
           } catch (SQLException e) {
               e.printStackTrace();
           }
       }
   
       // Define a method for creating tables.
       // Define a method for inserting data.
       // Define a method for querying data.
       // Define a method for updating data.
       // Define a method for deleting data.
   }
   

3. Define a method for creating tables.

   Define a private static method createTable for creating a table named test_hikaricp in the database. The table contains the id and name columns. To do this, perform the following steps:

   1. Define a private static method createTable that receives a Connection object as parameters, and declare that the method can throw an SQLException.
   2. Define an SQL statement string for creating a table named test_hikaricp. The table contains the id column of the NUMBER type and the name column of the VARCHAR2(50) type.
   3. Create a precompiled SQL statement object pstmt by using the Connection object conn and use the object in the try-with-resources block.
   4. Execute an SQL statement to create a table named test_hikaricp.
   5. If a success message is displayed in the console, the table is successfully created.

   Here is the sample code:

       private static void createTable(Connection conn) throws SQLException {
           String sql = "CREATE TABLE test_hikaricp (id NUMBER, name VARCHAR2(50))";
           try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
               pstmt.executeUpdate();
               System.out.println("Table created successfully.");
           }
       }
   

4. Define a method for inserting data.

   Define a private static method insertData for inserting data into the test_hikaricp table in the database. To do this, perform the following steps:

   1. Define a private static method insertData that receives a Connection object, an id parameter of the integer type, and a name parameter of the string type, and declare that the method can throw an SQLException.
   2. Define an SQL statement string for inserting the id and name columns into the test_hikaricp table.
   3. Create a precompiled SQL statement object pstmt by using the Connection object conn and use the object in the try-with-resources block.
   4. Set the value of the first parameter ? in the SQL statement to id.
   5. Set the value of the second parameter ? in the SQL statement to name.
   6. Execute the SQL statement to insert data into the table.
   7. If a success message is displayed in the console, the data is successfully inserted into the table.

   Here is the sample code:

       private static void insertData(Connection conn, int id, String name) throws SQLException {
           String sql = "INSERT INTO test_hikaricp (id, name) VALUES (?, ?)";
           try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
               pstmt.setInt(1, id);
               pstmt.setString(2, name);
               pstmt.executeUpdate();
               System.out.println("Data inserted successfully.");
           }
       }
   

5. Define a method for querying data.

   Define a private static method selectData for querying data from the test_hikaricp table in the database. To do this, perform the following steps:

   1. Define a private static method selectData that receives a Connection object as parameters, and declare that the method can throw an SQLException.
   2. Define an SQL statement string for querying all data in the test_hikaricp table.
   3. Create a precompiled SQL statement object pstmt by using the Connection object conn and use the object in the try-with-resources block. Call the executeQuery() method to execute an SQL query and return the query result set object rs.
   4. If a message is displayed in the console, user data is being returned.
   5. Traverse the query result set. Call the next() method to check whether a next row exists in the result set. If yes, a loop begins.
   6. Obtain the values of the id column from the result set and assign them to the id variable.
   7. Obtain the values of the name column from the result set and assign them to the name variable.
   8. Return the id and name values of each row in the console.
   9. Return an empty row in the console.

   Here is the sample code:

       private static void selectData(Connection conn) throws SQLException {
           String sql = "SELECT * FROM test_hikaricp";
           try (PreparedStatement pstmt = conn.prepareStatement(sql);
               ResultSet rs = pstmt.executeQuery()) {
               System.out.println("User Data:");
               while (rs.next()) {
                   int id = rs.getInt("id");
                   String name = rs.getString("name");
                   System.out.println("ID: " + id + ", Name: " + name);
               }
               System.out.println();
           }
       }
   

6. Define a method for updating data.

   Define a private static method updateData for updating data in the test_hikaricp table in the database. To do this, perform the following steps:

   1. Define a private static method updateData that receives a Connection object, an id parameter of the integer type, and a name parameter of the string type, and declare that the method can throw an SQLException.
   2. Define an SQL statement string for updating the value of the name column in the row whose id column value equals the specified id value in the test_hikaricp table to the specified name value.
   3. Create a precompiled SQL statement object pstmt by using the Connection object conn and use the object in the try-with-resources block.
   4. Set the value of the first parameter ? in the SQL statement to name.
   5. Set the value of the second parameter ? in the SQL statement to id.
   6. Execute the SQL statement to update data in the table.
   7. If a success message is displayed in the console, the data is successfully updated.

   Here is the sample code:

       private static void updateData(Connection conn, String name, int id) throws SQLException {
           String sql = "UPDATE test_hikaricp SET name = ? WHERE id = ?";
           try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
               pstmt.setString(1, name);
               pstmt.setInt(2, id);
               pstmt.executeUpdate();
               System.out.println("Data updated successfully.");
           }
       }
   

7. Define a method for deleting data.

   Define a private static method deleteData for deleting data that meets the specified condition from the test_hikaricp table in the database. To do this, perform the following steps:

   1. Define a private static method deleteData that receives a Connection object and an id parameter of the integer type, and declare that the method can throw an SQLException.
   2. Define an SQL statement string for deleting data that meets the id = ? condition from the test_hikaricp table.
   3. Create a precompiled SQL statement object pstmt by using the Connection object conn and use the object in the try-with-resources block.
   4. Set the value of the first parameter ? in the SQL statement to id.
   5. Execute the SQL statement to delete data that meets the specified condition from the table.
   6. If a success message is displayed in the console, the data is successfully deleted.

   Here is the sample code:

       private static void deleteData(Connection conn, int id) throws SQLException {
           String sql = "DELETE FROM test_hikaricp WHERE id = ?";
           try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
               pstmt.setInt(1, id);
               pstmt.executeUpdate();
               System.out.println("Data deleted successfully.");
           }
       }
   

Complete code

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.oceanbase</groupId>
    <artifactId>hikaricp-oceanbase-client</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>8</source>
                    <target>8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <dependency>
            <groupId>com.oceanbase</groupId>
            <artifactId>oceanbase-client</artifactId>
            <version>2.4.2</version>
        </dependency>
        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
            <version>3.3.1</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.5</version>
        </dependency>
    </dependencies>
</project>

jdbcUrl=jdbc:oceanbase://$host:$port/$schema_name
username=$user_name
password=$password

dataSource.cachePrepStmts=true
dataSource.prepStmtCacheSize=250
dataSource.maxLifetime=1800000
dataSource.idleTimeout=600000
dataSource.connectionTimeout=30000

package com.example;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;

public class Main {
    public static void main(String[] args) {
        try {
            HikariConfig config = new HikariConfig("/db.properties");
            try (HikariDataSource dataSource = new HikariDataSource(config);
                 Connection conn = dataSource.getConnection()) {
                createTable(conn);

                insertData(conn, 1, "A1");
                insertData(conn, 2, "A2");

                selectData(conn);

                updateData(conn, "test_update", 1);
                selectData(conn);

                deleteData(conn, 2);
                selectData(conn);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    private static void createTable(Connection conn) throws SQLException {
        String sql = "CREATE TABLE test_hikaricp (id NUMBER, name VARCHAR2(50))";
        try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
            pstmt.executeUpdate();
            System.out.println("Table created successfully.");
        }
    }

    private static void insertData(Connection conn, int id, String name) throws SQLException {
        String sql = "INSERT INTO test_hikaricp (id, name) VALUES (?, ?)";
        try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
            pstmt.setInt(1, id);
            pstmt.setString(2, name);
            pstmt.executeUpdate();
            System.out.println("Data inserted successfully.");
        }
    }

    private static void selectData(Connection conn) throws SQLException {
        String sql = "SELECT * FROM test_hikaricp";
        try (PreparedStatement pstmt = conn.prepareStatement(sql);
             ResultSet rs = pstmt.executeQuery()) {
            System.out.println("User Data:");
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                System.out.println("ID: " + id + ", Name: " + name);
            }
            System.out.println();
        }
    }

    private static void updateData(Connection conn, String name, int id) throws SQLException {
        String sql = "UPDATE test_hikaricp SET name = ? WHERE id = ?";
        try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
            pstmt.setString(1, name);
            pstmt.setInt(2, id);
            pstmt.executeUpdate();
            System.out.println("Data updated successfully.");
        }
    }

    private static void deleteData(Connection conn, int id) throws SQLException {
        String sql = "DELETE FROM test_hikaricp WHERE id = ?";
        try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
            pstmt.setInt(1, id);
            pstmt.executeUpdate();
            System.out.println("Data deleted successfully.");
        }
    }
}

References

• For more information about OceanBase Connector/J, see OceanBase Connector/J.
• For more information about the HikariCP connection pool, see HikariCP.