How do I get the max concurrent connection to a database?

By I Wayan Saryada in JDBC 0 Comment 
package org.kodejava.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;

public class MaxConcurrentConnection {
    private static final String URL = "jdbc:mysql://localhost/kodejava";
    private static final String USERNAME = "kodejava";
    private static final String PASSWORD = "s3cr*t";

    public static void main(String[] args) {
        try (Connection connection =
                     DriverManager.getConnection(URL, USERNAME, PASSWORD)) {
            DatabaseMetaData metadata = connection.getMetaData();

            // Get the information of maximum concurrent connection to the
            // database. The maximum number of active connections possible
            // at one time; a result of zero means that there is no limit
            // or the limit is not known.
            int maxConnection = metadata.getMaxConnections();
            System.out.println("Maximum Connection = " + maxConnection);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

The result of the code snippet above:

Maximum Connection = 0

Maven Dependencies

<dependency>
    <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
    <version>8.4.0</version>
</dependency>

Maven Central

How do I get database maximum table name length?

By I Wayan Saryada in JDBC 0 Comment 
package org.kodejava.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;

public class MaximumTableNameLength {
    private static final String URL = "jdbc:mysql://localhost/kodejava";
    private static final String USERNAME = "kodejava";
    private static final String PASSWORD = "s3cr*t";

    public static void main(String[] args) {
        try (Connection connection =
                     DriverManager.getConnection(URL, USERNAME, PASSWORD)) {
            DatabaseMetaData metadata = connection.getMetaData();

            // Get the information of database table name maximum length 
            int maxLength = metadata.getMaxTableNameLength();
            System.out.println("Max Table Name Length = " + maxLength);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

The result of the code snippet above is:

Max Table Name Length = 64

Maven Dependencies

<dependency>
    <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
    <version>8.4.0</version>
</dependency>

Maven Central

How do I know if database support updatable result sets?

By I Wayan Saryada in JDBC 0 Comment 
package org.kodejava.jdbc;

import java.sql.*;

public class SupportUpdatableResultSet {
    private static final String URL = "jdbc:mysql://localhost/kodejava";
    private static final String USERNAME = "kodejava";
    private static final String PASSWORD = "s3cr*t";

    public static void main(String[] args) {
        try (Connection connection =
                     DriverManager.getConnection(URL, USERNAME, PASSWORD)) {
            DatabaseMetaData meta = connection.getMetaData();

            boolean updatable = meta.supportsResultSetConcurrency(
                    ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_UPDATABLE);

            System.out.println("Updatable ResultSet = " + updatable);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

The result of the code snippet above:

Updatable ResultSet = true

Maven Dependencies

<dependency>
    <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
    <version>8.4.0</version>
</dependency>

Maven Central

How do I know if a database supports scrollable result sets?

By I Wayan Saryada in JDBC 0 Comment 
package org.kodejava.jdbc;

import java.sql.*;

public class SupportScrollableResultSet {
    private static final String URL = "jdbc:mysql://localhost/kodejava";
    private static final String USERNAME = "kodejava";
    private static final String PASSWORD = "s3cr*t";

    public static void main(String[] args) {
        try (Connection connection =
                     DriverManager.getConnection(URL, USERNAME, PASSWORD)) {
            DatabaseMetaData meta = connection.getMetaData();

            boolean isForwardOnly = meta.supportsResultSetType(
                    ResultSet.TYPE_FORWARD_ONLY);
            System.out.println("ForwardOnly = " + isForwardOnly);

            boolean isScrollInsensitive = meta.supportsResultSetType(
                    ResultSet.TYPE_SCROLL_INSENSITIVE);
            System.out.println("ScrollInsensitive = " + isScrollInsensitive);

            boolean isScrollSensitive = meta.supportsResultSetType(
                    ResultSet.TYPE_SCROLL_SENSITIVE);
            System.out.println("ScrollSensitive = " + isScrollSensitive);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

The result of the code snippet above:

ForwardOnly = true
ScrollInsensitive = true
ScrollSensitive = false

Maven Dependencies

<dependency>
    <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
    <version>8.4.0</version>
</dependency>

Maven Central

How do I know if database support batch update?

By I Wayan Saryada in JDBC 0 Comment 
package org.kodejava.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;

public class BatchSupportChecker {
    private static final String URL = "jdbc:mysql://localhost/kodejava";
    private static final String USERNAME = "kodejava";
    private static final String PASSWORD = "s3cr*t";

    public static void main(String[] args) {
        try (Connection connection =
                     DriverManager.getConnection(URL, USERNAME, PASSWORD)) {
            DatabaseMetaData metadata = connection.getMetaData();

            // Check to see if the database supports batch updates
            boolean isBatchSupported = metadata.supportsBatchUpdates();
            System.out.println("Batch Supported = " + isBatchSupported);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

Maven Dependencies

<dependency>
    <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
    <version>8.4.0</version>
</dependency>

Maven Central