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mybatis入门例子
开发步骤：
1.创建java工程
2.加入jar包（依赖包、驱动包）
3.创建sqlMapConfig.xml
4.创建数据库，数据库表USER_C，插入测试记录
5.创建PO对象 user.java
6.创建映射文件 User.xml
7.创建测试类
占位符：
iBatis #id#
myBatis #{id}
1、创建web工程
2、导入jar包：
mybatis-3.2.2.jar
asm-3.3.1.jar
cglib-2.2.2.jar
commons-logging-1.1.1.jar
javassist-3.17.1-GA.jar
log4j-1.2.17.jar
slf4j-api-1.7.5.jar
slf4j-log4j12-1.7.5.jar
3、配置文件 sqlMapConfig.xml ：
事务：JDBC/MANAGED
数据源：UNPOOLED/POOLED/JNDI
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE configuration 3 PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 4 "http://mybatis.org/dtd/mybatis-3-config.dtd"> 5 <configuration> 6 <environments default="development"> 7 <environment id="development"> 8 <transactionManager type="JDBC"/> 9 <dataSource type="POOLED">10 <property name="driver" value="com.mysql.jdbc.Driver"/>11 <property name="url" value="jdbc:mysql://localhost:3306/mybatisdb?characterEncoding=UTF-8"/>12 <property name="username" value="root"/>13 <property name="password" value="root"/>14 </dataSource>15 </environment>16 </environments>17 18 <mappers>19 <mapper resource="cn/itcast/mybatis/domain/User.xml"/>20 </mappers>21 </configuration>
4.创建数据库
创建mybatisdb数据库
创建User表
create table USER_C
(
ID varchar(40) not null,
NAME varchar(30),
AGE int,
ADDRESS varchar(200),
primary key (ID)
);
insert into `user_c`(`id`,`name`,`age`,`address`)
values (‘1‘,‘夏言‘,73,‘桂州村‘),
(‘2‘,‘严嵩‘,87,‘分宜县城介桥村‘),
(‘3‘,‘徐阶‘,80,‘明松江府华亭县‘),
(‘4‘,‘高拱‘,66,‘河南省新郑市高老庄村‘),
(‘5‘,‘张居正‘,58,‘江陵‘);
5、映射文件 cn.itcast.mybatis.domain.User.xml ：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE mapper 3 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 4 "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 5 <!-- 命名空间用于查找 --> 6 <mapper namespace="cn.itcast.mybatis"> 7 8 <!-- 替代，语句中的内容,简写 --> 9 <sql id="cols">10 id,name,age,address 11 </sql>12 <!-- 查询所有记录 -->13 <select id="listAll" resultType="cn.itcast.domain.User">14 select <include refid="cols"/> from user_c 15 </select>16 17 <!-- 查询一个用户 --> <!-- 别名替代，简写-->18 <select id="getOne" parameterType="string" resultType="aliasesUser">19 select <include refid="cols"/> from user_c where id= #{id} 20 </select>21 22 <!-- 插入一个用户 -->23 <insert id="insertOne" parameterType="cn.itcast.domain.User" >24 insert into user_c( <include refid="cols"/> ) values (#{id},#{name},#{age},#{address}) 25 </insert>26 27 <!-- 更新一个用户 -->28 <insert id="updateOne" parameterType="cn.itcast.domain.User" >29 update user_c set name=#{name},age=#{age},address=#{address} where id=#{id} 30 </insert>31 32 <!-- 删除一个用户 -->33 <update id="deleteOne" parameterType="cn.itcast.domain.User" >34 delete from user_c where id= #{id} 35 </update>36 </mapper>
6、PO对象 User.java ：
1 package cn.itcast.domain; 2 3 public class User { 4 private String id; 5 private String name; 6 private Integer age; 7 private String address; 8 public String getAddress() { 9 return address;10 }11 public void setAddress(String address) {12 this.address = address;13 }14 public String getId() {15 return id;16 }17 public void setId(String id) {18 this.id = id;19 }20 public String getName() {21 return name;22 }23 public void setName(String name) {24 this.name = name;25 }26 public Integer getAge() {27 return age;28 }29 public void setAge(Integer age) {30 this.age = age;31 }32 @Override33 public String toString() {34 return "User [id=" + id + ", name=" + name + ", age=" + age + "]";35 }36 37 }
7、测试类：
1 package cn.itcast.test; 2 3 import java.io.IOException; 4 import java.io.InputStream; 5 import java.util.List; 6 import java.util.UUID; 7 8 import org.apache.ibatis.io.Resources; 9 import org.apache.ibatis.session.SqlSession;10 import org.apache.ibatis.session.SqlSessionFactory;11 import org.apache.ibatis.session.SqlSessionFactoryBuilder;12 import org.junit.Before;13 import org.junit.Test;14 15 import cn.itcast.domain.User;16 17 public class TestMybatis {18 19 SqlSessionFactory sqlSessionFactory;20 21 @Before22 public void initFactory() throws IOException23 {24 String resource = "sqlMapConfig.xml";25 26 InputStream inputStream = Resources.getResourceAsStream(resource);27 28 sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);29 }30 31 @Test32 public void testListAll()33 {34 SqlSession session=sqlSessionFactory.openSession();35 List<User> users=session.selectList("cn.itcast.mybatis.listAll");36 System.out.println(users.size());37 }38 @Test39 public void testQueryOne()40 {41 SqlSession session=sqlSessionFactory.openSession();42 User user=session.selectOne("cn.itcast.mybatis.getOne", 1);43 System.out.println(user);44 }45 //事务需要程序员处理46 @Test47 public void testInsertOne()48 {49 User u=new User();50 u.setId(UUID.randomUUID().toString());51 u.setName("sbsbb");52 u.setAge(18);53 u.setAddress("china");54 SqlSession session=sqlSessionFactory.openSession();55 int count=session.insert("cn.itcast.mybatis.insertOne", u);56 session.commit();57 System.out.println(count);58 }59 60 @Test61 public void testUpdateOne()62 {63 SqlSession session=sqlSessionFactory.openSession();64 User u=new User();65 //u=session.selectOne("cn.itcast.mybatis.getOne", "2");66 u.setId("2");67 u.setName("clclclclclcfei");68 u.setAge(100);69 u.setAddress("USA");70 int count=session.update("cn.itcast.mybatis.updateOne", u);71 session.commit();72 System.out.println(count);73 }74 @Test75 public void testDeleteOne()76 {77 SqlSession session=sqlSessionFactory.openSession();78 User u=new User();79 u.setId("2");80 int count=session.delete("cn.itcast.mybatis.deleteOne", u);81 session.commit();82 System.out.println(count);83 }84 85 86 87 }
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