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Java DatabaseMetaData getMaxColumnsInTable() method with example.
The getMaxColumnsInTable() method of the DatabaseMetaData interface is used to find out the maximum number of columns that the underlying database allows in a table.
This method returns an integer value, representing the maximum number of columns allowed in a table. If this value is 0 it indicates that there is no limit or, limit is unknown.
To get the DatabaseMetaData object −
Make sure your database is up and running.
Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.
Get the connection object using the getConnection() method of the DriverManager class. Pass the URL the database and, user name, password of a user in the database, as String variables.
Get the DatabaseMetaData object with respect to the current connection using the getMetaData() method of the Connection interface.
Finally, get the maximum number of columns allowed in a table, by invoking the getMaxColumnsInTable() method (of the DatabaseMetaData interface).
Example
Following JDBC example connects to MySQL database, retrieves and prints the maximum number of columns allowed in a table, by it.
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DatabaseMetadata_getMaxColumnsInTable {
public static void main(String args[]) throws SQLException {
//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//Getting the connection
String url = "jdbc:mysql://localhost/mydatabase";
Connection con = DriverManager.getConnection(url, "root", "password");
System.out.println("Connection established......");
//Retrieving the meta data object
DatabaseMetaData metaData = con.getMetaData();
//Retrieving the maximum number of columns allowed in a table
int maxColumns = metaData.getMaxColumnsInTable();
System.out.println("Maximum number of columns allowed in a table: "+maxColumns);
}
}Output
Connection established...... Maximum number of columns allowed in a table: 512
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