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JDBC: MetaData Example
Posted on: September 27, 2012 at 12:00 AM
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In this section we are discussing how to get information of MetaData using JDBC API.

JDBC: MetaData Example

In this section we are discussing how to get information of MetaData using JDBC API.

MetaData  :

DatabaseMetaData interface is mentioned in java.sql package. It is implemented by the Driver vendors which helps user to know the capabilities of DBMS.
DatabaseMetaData provides many methods some of them returns lists of information in ResultSet object form and some of them takes String pattern arguments.

getMetaData() method retrieves a DatabaseMetaData object that holds the metadata about the database for the specified connection object.
Metadata contains information of all database tables, supported SQL grammar, its stored procedures ,capabilities of the connection etc.

getTypeInfo() method retrieves a description of all the data types supported by the database. They are ordered by DATA_TYPE and
then by how closely the data type maps to the corresponding JDBC SQL type.

Example : In this example we are displaying all the data types  list of database students by using  getTypeInfo() method.

package jdbc;

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

class MetaDataExample{
	public static void main(String[] args){
		System.out.println("MetaData Example...");
		Connection con = null;
		ResultSet rs = null;
		String url = "jdbc:mysql://localhost:3306/";
		String dbName = "students";
		String driverName = "com.mysql.jdbc.Driver";
		String userName = "root";
		String password = "root";
		try {
			Class.forName(driverName);

			// Connecting to the database
			con = DriverManager.getConnection(url + dbName, userName, password);
			try {

				// Getting Type Info
				DatabaseMetaData md = con.getMetaData();
				rs = md.getTypeInfo();
				int i=0;
				System.out.println("List of data Type -");
				while (rs.next()) {
					System.out.println(rs.getString("TYPE_NAME"));
					i++;
					}
				System.out.println("Total Data Type : "+i);
			} catch (SQLException e) {
				System.out.println(e);
			}
			con.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

Output :

MetaData Example...
List of data Type -

BIT
BOOL
TINYINT
TINYINT UNSIGNED
BIGINT
BIGINT UNSIGNED
LONG VARBINARY
MEDIUMBLOB
LONGBLOB
BLOB
TINYBLOB
VARBINARY
BINARY
LONG VARCHAR
MEDIUMTEXT
LONGTEXT
TEXT
TINYTEXT
CHAR
NUMERIC
DECIMAL
INTEGER
INTEGER UNSIGNED
INT
INT UNSIGNED
MEDIUMINT
MEDIUMINT UNSIGNED
SMALLINT
SMALLINT UNSIGNED
FLOAT
DOUBLE
DOUBLE PRECISION
REAL
VARCHAR
ENUM
SET
DATE
TIME
DATETIME
TIMESTAMP

Total Data Type : 40

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Posted on: September 27, 2012

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