完成对数据库的CRUD操作

PS:查询相对复杂，要处理结果集，增删改则不用。

 package it.cast.jdbc;

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

 public class CRUD {

     /**
      * @param args
      * @throws ClassNotFoundException
      * @throws SQLException
      */
     public static void main(String[] args) throws SQLException, ClassNotFoundException {
         delete();

     }

     //删除
     static void delete() throws SQLException, ClassNotFoundException {

         Connection conn = null;
         Statement st = null;
         ResultSet rs = null;
         // 2.建立连接
         conn = jdbcUtils.getConnection();

         // 3.创建语句
         st = conn.createStatement();

         String sql = "delete from user where name='name1'";

         // 4.执行语句
         int i = st.executeUpdate(sql);

         System.out.println("I="+i);

         // 6.释放资源
         jdbcUtils.free(rs, st, conn);
     }

     //修改
     static void update() throws SQLException, ClassNotFoundException {

         Connection conn = null;
         Statement st = null;
         ResultSet rs = null;
         // 2.建立连接
         conn = jdbcUtils.getConnection();

         // 3.创建语句
         st = conn.createStatement();

         String sql = "update user set money=money+10";

         // 4.执行语句
         int i = st.executeUpdate(sql);

         System.out.println("I="+i);

         // 6.释放资源
         jdbcUtils.free(rs, st, conn);
     }

     //新增
     static void create() throws SQLException, ClassNotFoundException {

         Connection conn = null;
         Statement st = null;
         ResultSet rs = null;
         // 2.建立连接
         conn = jdbcUtils.getConnection();

         // 3.创建语句
         st = conn.createStatement();

         String sql = "insert into user(name,birthday,money) values('name1','1997-01-01',4000)";

         // 4.执行语句
         int i = st.executeUpdate(sql);

         System.out.println("I="+i);

         // 6.释放资源
         jdbcUtils.free(rs, st, conn);
     }

 }

CRUD