简单java连接oracle，Statement，PreparedStatement，CallableStatement操作

package test;

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;

public class c {

public static void main(String[] args) throws Exception{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection c=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "llccdd", "llccdd");

/** Statement **/
/*String sql="select t.tid,t.tname from tt t";
String addSql="insert into tt(tid,tname) values (5,'衡水')";
String delSql="delete from tt where tid=1";
String updSql="update tt set tname='赵六' where tid=4";

Statement s=c.createStatement();
ResultSet r=s.executeQuery(sql);
while(r.next()){
int a=r.getInt(1);
String b=r.getString(2);
System.out.println(a+"="+b);
}

int i=s.executeUpdate(addSql);//delSql,updSql
System.out.println(i);*/

/** PreparedStatement **/
/* String sql="select t.tid,t.tname from tt t where t.tid=?";
String addSql="insert into tt(tid,tname) values (?,?)";
String delSql="delete from tt where tid=?";
String updSql="update tt set tname=? where tid=?";

PreparedStatement p1=c.prepareStatement(sql);
p1.setObject(1, 2);
ResultSet r=p1.executeQuery();
while(r.next()){
int a=r.getInt(1);
String b=r.getString(2);
System.out.println(a+"="+b);
}

PreparedStatement p2=c.prepareStatement(addSql);//delSql,updSql
p2.setObject(1, 5);
p2.setObject(2, "衡水");
int i=p2.executeUpdate();
System.out.println(i);*/

/** CallableStatement **/
CallableStatement  ca=c.prepareCall("{call pro_test(?,?)}");
ca.setObject(1, 2);
ca.registerOutParameter(2, Types.VARCHAR);
ca.execute();
String s=ca.getString(2);
System.out.println(s);

}

}

create or replace procedure pro_test(nn in number,mm out varchar2) as
pp varchar2(50);
begin
select t.tname into pp from tt t where t.tid=nn;
mm:=pp;
end pro_test;