jdbc add and delete operations

package com.xiyou;


import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;


import org.junit.Test;


public class Demo4 {
@Test
public void testAdd(){
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
try{
conn=JdbcUtil.getConnection();
stmt=conn.createStatement();
String sql="insert into users(id,name,password,email,birthday) values('4','ybw','123456','[email protected]','1990-09-09')";
int num=stmt.executeUpdate(sql);
if(num>0){
System.out.println("添加成功");
}
}catch(Exception e){
throw new RuntimeException(e);
}finally{
JdbcUtil.release(rs, stmt, conn);
}
}
@Test
public void testDelete(){
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
try{
conn=JdbcUtil.getConnection();
stmt=conn.createStatement();
String sql="delete from users where id=1;";
int num=stmt.executeUpdate(sql);
if(num>0){
System.out.println("删除成功");
}
}catch(Exception e){
throw new RuntimeException(e);
}finally{
JdbcUtil.release(rs, stmt, conn);
}
}@Test
public void testUpdate(){
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
try{
conn=JdbcUtil.getConnection();
stmt=conn.createStatement();
String sql="update users set password='wyl' where id=2;";
int num=stmt.executeUpdate(sql);
if(num>0){
System.out.println("更新成功");
}
}catch(Exception e){
throw new RuntimeException(e);
}finally{
JdbcUtil.release(rs, stmt, conn);
}
}
@Test
public void testQuery(){
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
try{
conn=JdbcUtil.getConnection();
stmt=conn.createStatement();
String sql="select * from users";
rs=stmt.executeQuery(sql);
while(rs.next()){
System.out.println(rs.getString("name"));
}
}catch(Exception e){
throw new RuntimeException(e);
}finally{
JdbcUtil.release(rs, stmt, conn);
}
}
}