JDBC-ODBC Connectivity
The code illustrates an example from JDBC-ODBC Connectivity. The code
helps you in retrieve the name and size of the column. To understand this
example we have a class JdbcOdbcConnectivity ,the class include a main
method ( ) follows a list of step in it - Importing a package
java.sql,provides you a network interface for the interaction between front-end application
in java and database in the backend. The first step inside the main
method ( ) is to load a driver by calling class.forName ( ) by accepting driver
class as argument. DriverManager.getConnection ( ) :The
Driver Manager call getConnection ( ) returns you an object of connection class. This
method is used to built a connection between url and database. The
Connection object call createStatement ( ),this return you a sql
object to send and execute SQL Statements in database. executeQuery
( ) : This method return you a record set from a table using select query in sql.The
obtained record set is stored in result set. get Metadata ( ) :
This
method return you the property of the column's data type, size, the methods,
properties, and parameters of a component associated with object in an
application. get ColumnCount ( ): This method return you
the number of column in a result set. Finally the println print the column
name get Column Display Size ( ): This method return you the
designated column's normal maximum width in characters. In case there
exists an exception in try block, the catch block check and handle. the
exception.
JdbcOdbcConnectivity.java
import java.sql.*;
public class JdbcOdbcConnectivity {
static private final String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
static private final String connection = "jdbc:odbc:emp";
public static void main(String args[]) {
Connection con = null;
Statement st = null;
ResultSet rs = null;
ResultSetMetaData metaData = null;
try {
Class.forName(driver);
con = DriverManager.getConnection(connection);
st = con.createStatement();
String sql = "select * from Employees";
rs = st.executeQuery(sql);
metaData = rs.getMetaData();
int rowCount = metaData.getColumnCount();
System.out.println("Table Name : " +
metaData.getTableName(rowCount));
System.out.println("Field\t\t" +"Type");
System.out.println("--------------------");
for (int i = 0; i < rowCount; i++) {
System.out.print( metaData.getColumnName(i+1)+"\t");
System.out.println(" "+metaData.getColumnDisplaySize(i+1));
}
con.close();
} catch (Exception e) {
System.out.println(e);
}
}
}
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Output
rno libno
1 101
2 102
3 103
4 104
5 105
6 106
7 107
8 108
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