Sunday, 13 July 2014

JDBC ResultSetMetadata Demo


















Click here to watch in Youtube : https://www.youtube.com/watch?v=cdnBS9E_4Ow

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JDBCResultSetMetaDataDemo Project Dir Structure
JDBC ResultSetMetadata

JDBCResultSetMetaDataDemo.java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCResultSetMetaDataDemo
{
    // JDBC driver name and database URL
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost:3306/world";

    // Database credentials
    static final String USERNAME = "root";
    static final String PASSWORD = "root";

    public static void main(String[] args)
    {

        JDBCResultSetMetaDataDemo jdbcResultSetMetaDataDemo = 
                                       new JDBCResultSetMetaDataDemo();
        jdbcResultSetMetaDataDemo.getCityMetadataInformation();

    }

    private void getCityMetadataInformation()
    {
        Connection connection = null;
        Statement stmt = null;
        try
        {
            /*
             * Register the JDBC driver in DriverManager
             */

            Class.forName(JDBC_DRIVER);

            /*
             * Establish connection to the Database using DriverManager
             */

            connection = DriverManager
                    .getConnection(DB_URL, USERNAME, PASSWORD);

            stmt = connection.createStatement();
            String sql = "select ID,Name,CountryCode,District,Population from city";

            /*
             * Execute a query
             */

            ResultSet rs = stmt.executeQuery(sql);

            ResultSetMetaData rsmd = rs.getMetaData();

            int columnCount = rsmd.getColumnCount();
            System.out.println("Total number of columns : " + columnCount
                    + "\n");

            /*
             * Get all column names,column type and columnDisplaySize from the
             * ResultSetMetaData
             */
            for (int i = 1; i <= columnCount; i++)
            {
                String columnName = rsmd.getColumnName(i);
                String columnType = rsmd.getColumnTypeName(i);
                int columnDisplaySize = rsmd.getColumnDisplaySize(i);
                System.out.println("ColumnName : " + columnName + ","
                        + "ColumnType : " + columnType + ","
                        + "ColumnDisplaySize : " + columnDisplaySize);
                System.out.println();
            }

            rs.close();
            stmt.close();
            connection.close();
        }
        catch (SQLException se)
        {
            /*
             * Handle errors for JDBC
             */
            se.printStackTrace();
        }
        catch (ClassNotFoundException e)
        {
            /*
             * Handle errors for Class.forName
             */
            e.printStackTrace();
        }
        finally
        {
            /*
             * finally block used to close resources
             */
            try
            {
                if (stmt != null)
                {
                    stmt.close();
                }
            }
            catch (SQLException sqlException)
            {
                sqlException.printStackTrace();
            }
            try
            {
                if (connection != null)
                {
                    connection.close();
                }
            }
            catch (SQLException sqlException)
            {
                sqlException.printStackTrace();
            }
        }

    }

}

Output
Total number of columns : 5

ColumnName : ID,ColumnType : INT,ColumnDisplaySize : 11

ColumnName : Name,ColumnType : CHAR,ColumnDisplaySize : 35

ColumnName : CountryCode,ColumnType : CHAR,ColumnDisplaySize : 3

ColumnName : District,ColumnType : CHAR,ColumnDisplaySize : 20

ColumnName : Population,ColumnType : INT,ColumnDisplaySize : 11

Environment Used 

JDK version : 1.7.0_51
Mysql Server version : 5.6.19 

To Download JDBCResultSetMetaDataDemoApp Project Click the below link

https://sites.google.com/site/javaee4321/jdbc/JDBCResultSetMetaDataDemoApp.zip?attredirects=0&d=1

See also:

  • Servlets Tutorial
  • All Design Patterns Links
  • JDBC Tutorial
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