Java使用Statement接口执行SQL语句操作实例分析

这篇文章主要介绍了Java使用Statement接口执行sql语句操作,结合实例形式详细分析了Java使用Statement接口针对MysqL数据库进行连接与执行sql语句增删改查等相关操作技巧与注意事项,需要的朋友可以参考下

本文实例讲述了Java使用Statement接口执行sql语句操作的方法。分享给大家供大家参考，具体如下：

Statement执行sql语句：

1. 对数据库的曾删改操作时，使用stmt.executeUpdate(sql)  执行给定 sql 语句，分别为 insert 、update、delete.

2. 对数据库做查询时，直接使用 stmt.executeQuery(sql)，返回结果可以为一个resultSet结果集。

首先做一些准备工作：

①对要进行操作的数据库表进行封装，比如说我的数据mydata中的aistu表，用aimember.java进行封装，以便后面操作。具体如下：

package com.MysqLtest.jdbc.model; /** * 定义一个model * 成员模型 * @author AI_STU * */ public class aimember { private String name; private int id; private int age; private String email; private String tel; private double salary; private String riqi; /** * alt+shift+s 添加构造函数generating constructor using fields. * @param name * @param id * @param age * @param email * @param tel * @param salary * @param riqi */ public aimember(String name, int id, int age, String email, String tel, double salary, String riqi) { super(); this.name = name; this.id = id; this.age = age; this.email = email; this.tel = tel; this.salary = salary; this.riqi = riqi; } //重构 public aimember(int id) { super(); this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getId() { return id; } public void setId(int id) { this.id = id; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public String getTel() { return tel; } public void setTel(String tel) { this.tel = tel; } public double getSalary() { return salary; } public void setSalary(double salary) { this.salary = salary; } public String getRiqi() { return riqi; } public void setRiqi(String riqi) { this.riqi = riqi; } }

②对连接MysqL数据库，和关闭连接方法进行封装，这里用DbUtil.java进行封装，具体如下：

package com.MysqLtest.jdbc.modelComp; public class CompMember { private int id; private String name; private int age; private double salary; /** * 构造函数1 * @param name * @param age * @param salary */ public CompMember(String name, int age, double salary) { super(); this.name = name; this.age = age; this.salary = salary; } /** * 重载构造函数 * @param id * @param name * @param age * @param salary */ public CompMember(int id, String name, int age, double salary) { super(); this.id = id; this.name = name; this.age = age; this.salary = salary; } /** * get,set方法 */ 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 getAge() { return age; } public void setAge(int age) { this.age = age; } public double getSalary() { return salary; } public void setSalary(double salary) { this.salary = salary; } @Override /** * 改写toString,使得显示更好 */ public String toString() { return "["+this.id+"]"+this.name+","+this.age+","+this.salary; } }

准备工作做好了，下面开始使用Statement接口执行sql语句来实现增删改：

①增：

package com.MysqLtest.jdbc.two2; import java.sql.Connection; import java.sql.Statement; import com.MysqLtest.jdbc.model.aimember; import com.MysqLtest.jdbc.util.DbUtil; public class Demo3 { /** * 添加成员到表中1 * @param name * @param id * @param age * @param email * @param tel * @param salary * @param riqi * @return * @throws Exception */ @SuppressWarnings("unused") private static int addMember(String name,int id,int age,String email,String tel,double salary,String riqi) throws Exception{ DbUtil dbUtil = new DbUtil();//之前封装好的 Connection con = dbUtil.getCon(); //获取数据库连接 String sql = "insert into aistu values('"+name+"',"+id+",'"+age+"','"+email+"','"+tel+"','"+salary+"','"+riqi+"')"; Statement stmt = con.createStatement();//获取statement int result = stmt.executeUpdate(sql); dbUtil.close(stmt, con); return result; } /** * 添加成员到表中2方法 * @param mem * @return * @throws Exception */ private static int addMember2(aimember mem) throws Exception{ //aimember也是之前封装好的 // mem.getName(); DbUtil dbUtil = new DbUtil();//之前封装好的 Connection con = dbUtil.getCon(); //获取数据库连接 String sql = "insert into aistu values('"+mem.getName()+"',"+mem.getId()+",'"+mem.getAge()+"','"+mem.getEmail()+"','"+mem.getTel()+"','"+mem.getSalary()+"','"+mem.getRiqi()+"')"; Statement stmt = con.createStatement();//获取statement int result = stmt.executeUpdate(sql); dbUtil.close(stmt, con); return result; } // private static int addMenber2() public static void main(String[] args) throws Exception { /*int result = addMember("刘翔", 4, 28, "[e-mail]", "13411957776", 8000.00, "2015-09-10"); if(result==1){ System.out.println("添加成功"); }else{ System.out.println("添加失败"); }*/ //多行注释，ctrl+shift+/ aimember mem = new aimember("李娜", 6, 25, "[e-mail]", "13411957775", 8000.00, "2015-09-03"); int result = addMember2(mem); if(result==1){ System.out.println("添加成功"); }else{ System.out.println("添加失败"); } } }

②改：

package com.MysqLtest.jdbc.two3; import java.sql.Connection; import java.sql.Statement; import com.MysqLtest.jdbc.model.aimember; import com.MysqLtest.jdbc.util.DbUtil; public class Demo4 { private static DbUtil dbUtil = new DbUtil(); // @SuppressWarnings("unused") /** * 修改成员 * @param mem * @return * @throws Exception */ private static int updateMember(aimember mem) throws Exception { Connection con = dbUtil.getCon(); // 获取数据库连接 String sql = "update aistu set name='" + mem.getName() + "',id=" + mem.getId() + ",age='" + mem.getAge() + "',email='" + mem.getEmail() + "',tel='" + mem.getTel() + "',salary='" + mem.getSalary() + "',riqi='" + mem.getRiqi() + "' where id=" + mem.getId(); //格式化，ctrl+a全选，然后ctrl+shift+f格式化 Statement stmt = con.createStatement();// 获取statement int result = stmt.executeUpdate(sql); dbUtil.close(stmt, con); return result; // return 0; } public static void main(String[] args) throws Exception { aimember mem = new aimember("劳尔", 6, 24, "[e-mail]", "13411957770", 18000.00, "2014-09-03"); int result = updateMember(mem); if (result==1) { System.out.println("更新成功"); } else { System.out.println("更新失败"); } } }

③删：

package com.MysqLtest.jdbc.two4; import java.sql.Connection; import java.sql.Statement; import com.MysqLtest.jdbc.model.aimember; import com.MysqLtest.jdbc.util.DbUtil; public class Demo5 { private static DbUtil dbUtil = new DbUtil(); public static int deletMember(aimember mem) throws Exception{ Connection con = dbUtil.getCon(); // 获取数据库连接 String sql = "delete from aistu where id="+mem.getId(); Statement stmt = con.createStatement();// 获取statement int result = stmt.executeUpdate(sql); dbUtil.close(stmt, con); return result; } public static void main(String[] args) throws Exception { aimember mem = new aimember(5); int result = deletMember(mem); if (result==1) { System.out.println("成功删除成员"); } else { System.out.println("删除成员失败"); } } }

更多关于java相关内容感兴趣的读者可查看本站专题：《Java+MysqL数据库程序设计总结》、《Java数据结构与算法教程》、《Java文件与目录操作技巧汇总》、《Java操作DOM节点技巧总结》和《Java缓存操作技巧汇总》

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