AnalyticDB for MySQL:Java

Supported MySQL JDBC driver versions

AnalyticDB for MySQL supports the following MySQL JDBC driver versions:

• 5.0 series: 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.0.7, and 5.0.8.

• 5.1 series: 5.1.1, 5.1.2, 5.1.3, 5.1.4, 5.1.5, 5.1.6, 5.1.7, 5.1.8, 5.1.11, 5.1.12, 5.1.13, 5.1.14, 5.1.15, 5.1.16, 5.1.17, 5.1.18, 5.1.19, 5.1.20, 5.1.21, 5.1.22, 5.1.23, 5.1.24, 5.1.25, 5.1.26, 5.1.27, 5.1.28, 5.1.29, 5.1.31, 5.1.32, 5.1.33, and 5.1.34.

• 8.0 series.

Usage notes

• To establish a connection by using a MySQL JDBC driver, you must manually add the package of the driver (mysql-connector-java-x.x.x.jar) to CLASSPATH. Otherwise, the connection cannot be established.

• If you want to use the multi-statement feature to consecutively execute multiple SQL statements, execute the SET ADB_CONFIG ALLOW_MULTI_QUERIES=true; statement to enable the multi-statement feature and set the allowMultiQueries property to true.

  Note

  Only AnalyticDB for MySQL clusters of V3.1.9.3 or later support the multi-statement feature.

Sample code for establishing a MySQL JDBC connection without retries

To connect to an AnalyticDB for MySQL cluster by using a MySQL JDBC driver, you can add the following sample code to the Java code of your business system:

Connection connection = null;
Statement statement = null;
ResultSet rs = null;
try {
    Class.forName("com.mysql.jdbc.Driver");
    // adb_url: the endpoint of the AnalyticDB for MySQL cluster to which you want to connect. You can obtain the endpoint on the Cluster Information page of the AnalyticDB for MySQL console. The default port number is 3306. 
    // db_name: the name of the database in the AnalyticDB for MySQL cluster. 
    String url = "jdbc:mysql://adb_url:3306/db_name?useUnicode=true&characterEncoding=UTF-8";
    Properties connectionProps = new Properties();
    // account_name: the account used to connect to the AnalyticDB for MySQL cluster. The account can be a privileged or standard account. 
    connectionProps.put("user", "account_name");
    // account_password: the password of the account used to connect to the AnalyticDB for MySQL cluster. 
    connectionProps.put("password", "account_password");
    connection = DriverManager.getConnection(url, connectionProps);
    statement = connection.createStatement();
    String query = "select count(*) from information_schema.tables";
    rs = statement.executeQuery(query);
    while (rs.next()) {
        System.out.println(rs.getObject(1));
    }
} catch (ClassNotFoundException e) {
    e.printStackTrace();
} catch (SQLException e) {
    e.printStackTrace();
} catch (Exception e) {
    e.printStackTrace();
} finally {
    if (rs != null) {
        try {
            rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    if (statement != null) {
        try {
            statement.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    if (connection != null) {
        try {
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}
            

Sample code for establishing a MySQL JDBC connection with retries

When you establish a MySQL JDBC connection, you can configure the following parameters to implement connection retry:

public static final int MAX_QUERY_RETRY_TIMES = 3;
public static Connection conn = null;
public static Statement statement = null;
public static ResultSet rs = null;
public static void main(String[] args) throws ClassNotFoundException {
    // db_name: the name of the database in the AnalyticDB for MySQL cluster. 
    String yourDB = "db_name";  
    // account_name: the account used to connect to the AnalyticDB for MySQL cluster. The account can be a privileged or standard account. 
    String username = "account_name";  
    // account_password: the password of the account used to connect to the AnalyticDB for MySQL cluster. 
    String password = "account_password"; 
    Class.forName("com.mysql.jdbc.Driver");
    // adb_url: the endpoint of the AnalyticDB for MySQL cluster to which you want to connect. You can obtain the endpoint on the Cluster Information page of the AnalyticDB for MySQL console. The default port number is 3306. 
    String url = "jdbc:mysql://adb_url:3306/" + yourDB + "?useUnicode=true&characterEncoding=UTF-8";
    Properties connectionProps = new Properties();
    connectionProps.put("user", username);
    connectionProps.put("password", password);
    String query = "select id from test4dmp.test limit 10";
    int retryTimes = 0;
    // Run automatic retries by using the loop. 
    while (retryTimes < MAX_QUERY_RETRY_TIMES) {
        try {
            getConn(url, connectionProps);
            execQuery(query);// Run a query. 
            break; // If the query is run, exit the loop. 
        } catch (SQLException e) {
            System.out.println("Met SQL exception: " + e.getMessage() + ", then go to retry task ...");
            try {
                if (conn == null || conn.isClosed()) {
                    retryTimes++;
                }
            } catch (SQLException e1) {
                if (conn != null) {
                    try {
                        conn.close();
                    } catch (SQLException e2) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
    // Clear connection resource.
    closeResource();
}
/**
 * Get connection.
 *
 * @param url
 * @param connectionProps
 * @throws SQLException
 */
public static void getConn(String url, Properties connectionProps) throws SQLException {
    conn = DriverManager.getConnection(url, connectionProps);
}
/**
 * Query task execution logic.
 *
 * @param sql
 * @throws SQLException
 */
public static void execQuery(String sql) throws SQLException {
    Statement statement = null;
    ResultSet rs = null;
    statement = conn.createStatement();
    for (int i = 0; i < 10; i++) {
        long startTs = System.currentTimeMillis();
        rs = statement.executeQuery(sql);
        int cnt = 0;
        while (rs.next()) {
            cnt++;
            System.out.println(rs.getObject(1) + " ");
        }
        long endTs = System.currentTimeMillis();
        System.out.println("Elapse Time: " + (endTs - startTs));
        System.out.println("Row count: " + cnt);
        try {
            Thread.sleep(160000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}
/**
 * Close connection resource.
 */
public static void closeResource() {
    if (rs != null) {
        try {
            rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    if (statement != null) {
        try {
            statement.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    if (conn != null) {
        try {
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}