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Java DatabaseMetaData getMaxCharLiteralLength() method with example.
The getMaxCharLiteralLength() method of the DatabaseMetaData interface is used to find out the maximum number of characters that the underlying database allows for a character literal.
This method returns an integer value, representing the maximum length of a character literal. 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 length of a character literal (allowed by the underlying database), by invoking the getMaxCharacterLiteralLength() method (of the DatabaseMetaData interface).
Example
Following JDBC example connects to MySQL database, retrieves and prints the maximum length of a character literal allowed by it.
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DatabaseMetadata_getMaxCharLiteralLength{
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 length of the character literal supported
int maxLlength = metaData.getMaxCharLiteralLength();
System.out.println("Retrieving the maximum length of the character literal supported: "+maxLlength);
}
}Output
Connection established...... Retrieving the maximum length of the character literal supported: 16777208
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