使用Statement接口实现增，删，改操作(工作中不常用这个，而用PreparedStatement接口)

一、Statement接口

作用：用于执行静态 SQL 语句并返回它所生成结果的对象。

1. 创建数据库连接类及相册实体，代码如下：

 package com.learn.jdbc.util;
 
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;
 import java.sql.Statement;
 
 /**
  * 封装数据库连接类
  * @author Administrator
  *
  */
 public class DbUtil {
     // 数据库连接
     private static String dbUrl = "jdbc:mysql://localhost:3306/yizhuangxiu?useUnicode=true&characterEncoding=utf-8";
     // 用户名
     private static String dbUserName = "root";
     // 密码
     private static String dbUserPwd  = "123456";
     // 驱动名
     private static String jdbcName = "com.mysql.jdbc.Driver";
 
     /**
      * 连接数据库
      * @return
      * @throws Exception
      */
     public Connection getCon() throws Exception{
         Class.forName(jdbcName);
         Connection con = DriverManager.getConnection(dbUrl, dbUserName, dbUserPwd);
         return con;
     }
 
     /**
      * 关闭连接
      * @throws Exception
      */
     public void close(Statement stmt,Connection con) throws Exception{
         if(stmt != null){
             stmt.close();
             if(con != null){
                 con.close();
             }
         }
     }
 
     /**
      * 关闭连接
      * @throws Exception
      */
     public void close(PreparedStatement pstmt,Connection con) throws Exception{
         if(pstmt != null){
             pstmt.close();
             if(con != null){
                 con.close();
             }
         }
     }
 
 }

 package com.learn.jdbc.model;
 
 import java.io.File;
 
 /**
  * 相册模型
  * @author Administrator
  *
  */
 public class Album {
 
     private int id;
     private String name;
     private int uid;
     private long time;
 
     private File content;
     private File pic;
 
     public Album(String name, int uid, long time) {
         this.name = name;
         this.uid = uid;
         this.time = time;
     }
 
     public Album(int id, String name, int uid, long time) {
         this.id = id;
         this.name = name;
         this.uid = uid;
         this.time = time;
     }
 
     public Album(String name, int uid, long time, File content, File pic) {
         super();
         this.name = name;
         this.uid = uid;
         this.time = time;
         this.content = content;
         this.pic = pic;
     }
 
     public int getId() {
         return id;
     }
 
     public void setId(int id) {
         this.id = id;
     }
 
     public String getName() {
         return name;
     }
 
     public void setName(String name) {
         this.name = name;
     }
 
     public int getUid() {
         return uid;
     }
 
     public void setUid(int uid) {
         this.uid = uid;
     }
 
     public long getTime() {
         return time;
     }
 
     public void setTime(long time) {
         this.time = time;
     }
 
     public File getContent() {
         return content;
     }
 
     public void setContent(File content) {
         this.content = content;
     }
 
     public File getPic() {
         return pic;
     }
 
     public void setPic(File pic) {
         this.pic = pic;
     }
 
     @Override
     public String toString() {
         return "["+this.id+","+this.name+","+this.uid+","+this.time+"]";
     }
 
 }

2. 实现数据增加、修改、删除

 package com.learn.jdbc.chap03;
 
 import java.sql.Connection;
 import java.sql.Statement;
 
 import com.learn.jdbc.model.Album;
 import com.learn.jdbc.util.DbUtil;
 
 public class Demo3 {
     private static DbUtil dbUtil=new DbUtil();
 
     /**
      * 添加相册-----用面向对象思想封装
      * @param ab
      * @return
      * @throws Exception
      */
     private static int addInfo2(Album ab) throws Exception{
         Connection con = dbUtil.getCon();
         String sql = "insert into sp_album values (null,'"+ab.getName()+"',"+ab.getUid()+","+ab.getTime()+")";
         Statement stmt = con.createStatement();
         int result=stmt.executeUpdate(sql);
         dbUtil.close(stmt, con);
         return result;
     }
 
     /**
      * 添加相册-----普通封装
      * @param name
      * @param uid
      * @param time
      * @return
      * @throws Exception
      */
     private static int addInfo(String name,int uid,long time) throws Exception{
         Connection con = dbUtil.getCon();
         String sql = "insert into sp_album values (null,'"+name+"',"+uid+","+time+")";
         Statement stmt = con.createStatement();
         int result=stmt.executeUpdate(sql);
         dbUtil.close(stmt, con);
         return result;
     }
 
     public static void main(String[] args) throws Exception{
         /*int result = addInfo("李四",8,System.currentTimeMillis());
         if(result>0){
             System.out.println("数据插入成功！");
         }else{
             System.out.println("数据插入失败！");
         }*/
 
         int result1 = addInfo2(new Album("呵呵",7,System.currentTimeMillis()));
         if(result1>0){
             System.out.println("数据插入成功！");
         }else{
             System.out.println("数据插入失败！");
         }
     }
 }

 package com.learn.jdbc.chap03;
 
 import java.sql.Connection;
 import java.sql.Statement;
 
 import com.learn.jdbc.model.Album;
 import com.learn.jdbc.util.DbUtil;
 
 public class Demo4 {
     private static DbUtil dbUtil = new DbUtil();
 
     /**
      * 更新相册
      * @param ab
      * @return
      * @throws Exception
      */
     private static int updateInfo(Album ab) throws Exception {
         Connection con = dbUtil.getCon();
         String sql = "update sp_album set name='" + ab.getName() + "',uid="
                 + ab.getUid() + ",add_time=" + ab.getTime() + " where id="
                 + ab.getId();
         Statement stmt = con.createStatement();
         int result = stmt.executeUpdate(sql);
         dbUtil.close(stmt, con);
         return result;
     }
 
     public static void main(String[] args) throws Exception {
         int result1 = updateInfo(new Album(12,"呵呵1", 6, System.currentTimeMillis()));
         if (result1 > 0) {
             System.out.println("数据修改成功！");
         } else {
             System.out.println("数据修改失败！");
         }
     }
 }

 package com.learn.jdbc.chap03;
 
 import java.sql.Connection;
 import java.sql.Statement;
 
 import com.learn.jdbc.model.Album;
 import com.learn.jdbc.util.DbUtil;
 
 public class Demo5 {
     private static DbUtil dbUtil = new DbUtil();
     /**
      * 删除数据
      * @param id
      * @return
      * @throws Exception
      */
     private static int deleteInfo(int id) throws Exception{
         Connection con = dbUtil.getCon();
         String sql = "delete from sp_album where id="+id;
         Statement stmt = con.createStatement();
         int result = stmt.executeUpdate(sql);
         dbUtil.close(stmt, con);
         return result;
     }
 
     public static void main(String[] args) throws Exception {
         int result1 = deleteInfo(13);
         if (result1 > 0) {
             System.out.println("数据删除成功！");
         } else {
             System.out.println("数据删除失败！");
         }
     }
 }

所用到的表结构

CREATE TABLE `sp_album_test` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT '' COMMENT '相册名称',
  `uid` int(11) DEFAULT '' COMMENT '用户id',
  `add_time` bigint(13) DEFAULT '' COMMENT '创建时间',
  `content` longtext COMMENT '简介',
  `pic` longblob COMMENT '图像',
  PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COMMENT='相册1'
 
CREATE TABLE `sp_account` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `accountName` varchar(255) DEFAULT '' COMMENT '转账用户',
  `accountBalance` double DEFAULT '' COMMENT '转账金额',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8 COMMENT='银行转账--Java测试'