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Thread: jdbc program

  1. #1
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    Default jdbc program

    /*program for implementing Desc command of oracle database in java*/

    import java.sql.*;
    public class jdbc2 {
    	public static void main(String arg[])throws ClassNotFoundException,SQLException
    	{
    		Class.forName("oracle.jdbc.driver.OracleDriver");
    		Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl","scott","tiger");
    		if(con==null)
    		{	System.out.println("sory unable to connect to DataBase " +
    					"Try again after sometime");
                                            return;
                    }
    		else
    			System.out.println("connected successfully");
     
    		String table=arg[0];
    		Statement stmt=con.createStatement();
    		ResultSet rs=stmt.executeQuery("select * from "+ table);
    		ResultSetMetaData rsmd=rs.getMetaData();
    		int n=rsmd.getColumnCount();
    		String s;
    		System.out.println("Name"+"\t\t\t"+"  Null?"+"\t\t\t"+"Type");
    		System.out.println("--------------------    -----------------    --------------");
    		for(int i=1;i<=n;i++)
    		{
     
    			if(rsmd.isNullable(i)==ResultSetMetaData.columnNoNulls)
    				s="  NOT NULL";
    			else
    		        s="          ";
    			if(rsmd.getColumnTypeName(i)=="DATE")
    				System.out.println(rsmd.getColumnName(i)+"\t"+"\t"+"\t"+"\t"+"\t"+rsmd.getColumnTypeName(i));
    			else
    			{
    				if(rsmd.getScale(i)==0)
    			System.out.println(rsmd.getColumnName(i)+"\t"+"\t"+"\t"+
    			       s+"\t"+"\t"+rsmd.getColumnTypeName(i)+
                    			"("+rsmd.getPrecision(i)
    			                   +")");
    				else
    					System.out.println(rsmd.getColumnName(i)+"\t"+"\t"+"\t"+
    						       s+"\t"+"\t"+rsmd.getColumnTypeName(i)+
    			                			"("+rsmd.getPrecision(i)+","
    						                   +rsmd.getScale(i)+")");
    		}}
    		rs.close();
    		rs=null;
    		stmt.close();
    		stmt=null;
    		con.close();
    		con=null;
    }
    }


    compiling and executing of this program
    --------------------------------------------
    1. compile as usual
    2 execute this program by providing table name as command line argument


  2. #2
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    Default Re: jdbc program

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