MyBatis【一】IntelliJ IDEA的第一个MyBatis Demo
参考
（1）使用IDEA创建javaweb项目
（2）MyBatis学习笔记(一）入门（重点）
（3）IntelliJ IDEA手动配置连接MySQL数据库
（4）IntelliJ IDEA单元测试入门
创建Java Web项目
参考：使用IDEA创建javaweb项目
导入MyBatis所需的jar包
参考：MyBatis学习笔记(一）入门
mybatis需要jar包：mybatis-3.4.2.jar
mysql驱动jar包：mysql-connector-java-5.1.39-bin.jar
日志记录jar包：log4j-1.2.17.jar，slf4j-api-1.7.12.jar，slf4j-log4j12-1.7.12.jar
创建数据库mybatis和表t_user
IDEA配置MySQL数据源
参考：IntelliJ IDEA手动配置连接MySQL数据库
点击Test Connection
点击OK后，可以看到
MyBatis入门Demo
参考：MyBatis学习笔记(一）入门
（1）代码结构
（2）mysql驱动配置文件
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=123456
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（3）日志配置文件
### 设置Logger输出级别和输出目的地 ###
log4j.rootLogger=debug,stdout,logfile
### 把日志信息输出到控制台 ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
#log4j.appender.stdout.Target=System.err
log4j.appender.stdout.layout=org.apache.log4j.SimpleLayout
### 把日志信息输出到文件：jbit.log ###
log4j.appender.logfile=org.apache.log4j.FileAppender
log4j.appender.logfile.File=jbit.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %F %p %m%n
###显示SQL语句部分
log4j.logger.com.ibatis=DEBUG
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=DEBUG
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=DEBUG
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=DEBUG
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG
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（4）MyBatis配置文件mybatis.cfg.xml
<configuration>
<properties resource="mysql.properties">properties>
<environments default="zzbatis">
<environment id="zzbatis">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
dataSource>
environment>
environments>
configuration>
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（5）创建对应的实体对象UserBean
package com.zz.mybatis.beans;
import java.io.Serializable;
public class UserBean implements Serializable{
private static final long serialVersionUID = 1L;
private Integer id;
private String username;
private String password;
private Double account;
public UserBean() {
super();
}
public UserBean(String username, String password, Double account) {
super();
this.username = username;
this.password = password;
this.account = account;
}
public UserBean(Integer id, String username, String password, Double account) {
super();
this.id = id;
this.username = username;
this.password = password;
this.account = account;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Double getAccount() {
return account;
}
public void setAccount(Double account) {
this.account = account;
}
@Override
public String toString() {
return "UserBean [id=" + id + ", username=" + username + ", password="
+ password + ", account=" + account + "]";
}
}
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（6）创建方法接口UserMapper.java和定义操作t_user表的sql映射文件UserMapper.xml
UserMapper.java
package com.zz.mybatis.mapper;
import java.util.List;
import com.zz.mybatis.beans.UserBean;
public interface UserMapper {
/**
* 新增用戶
* @param user
* @return
* @throws Exception
*/
public int insertUser(UserBean user) throws Exception;
/**
* 修改用戶
* @param user
* @param id
* @return
* @throws Exception
*/
public int updateUser (UserBean user,int id) throws Exception;
/**
* 刪除用戶
* @param id
* @return
* @throws Exception
*/
public int deleteUser(int id) throws Exception;
/**
* 根据id查询用户信息
* @param id
* @return
* @throws Exception
*/
public UserBean selectUserById(int id) throws Exception;
/**
* 查询所有的用户信息
* @return
* @throws Exception
*/
public List selectAllUser() throws Exception;
}
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UserMapper.xml
<mapper namespace="com.zz.mybatis.mapper.UserMapper">
<resultMap id="userMap" type="UserBean">
<id property="id" column="id" javaType="java.lang.Integer">id>
<result property="username" column="username" javaType="java.lang.String">result>
<result property="password" column="password" javaType="java.lang.String">result>
<result property="account" column="account" javaType="java.lang.Double">result>
resultMap>
<insert id="insertUser" useGeneratedKeys="true" keyProperty="id">
insert into t_user (username,password,account) values (#{username},#{password},#{account})
insert>
<update id="updateUser" >
update t_user set username=#{username},password=#{password},account=#{account} where id=#{id}
update>
<delete id="deleteUser" parameterType="int">
delete from t_user where id=#{id}
delete>
<select id="selectUserById" parameterType="int" resultMap="userMap">
select * from t_user where id=#{id}
select>
<select id="selectAllUser" resultMap="userMap">
select * from t_user
select>
mapper>
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mybatis.cfg.xml里注册UserMapper.xml文件
<configuration>
<properties resource="mysql.properties">properties>
<typeAliases >
<package name="com.zz.mybatis.beans"/>
typeAliases>
<environments default="zzbatis">
<environment id="zzbatis">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
dataSource>
environment>
environments>
<mappers>
<package name="com/zz/mybatis/mapper"/>
mappers>
configuration>
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（7）建立一个工具类DBTools
DBTools.java：
package com.zz.mybatis.tools;
import java.io.Reader;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class DBTools {
public static SqlSessionFactory sessionFactory;
static{
try {
//使用MyBatis提供的Resources类加载mybatis的配置文件
Reader reader = Resources.getResourceAsReader("mybatis.cfg.xml");
//构建sqlSession的工厂
sessionFactory = new SqlSessionFactoryBuilder().build(reader);
} catch (Exception e) {
e.printStackTrace();
}
}
//创建能执行映射文件中sql的sqlSession
public static SqlSession getSession(){
return sessionFactory.openSession();
}
}
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（8）测试
参考：IntelliJ IDEA单元测试入门
UserServiceTest：
package com.zz.mybatis.service;
import com.zz.mybatis.beans.UserBean;
import com.zz.mybatis.mapper.UserMapper;
import com.zz.mybatis.tools.DBTools;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import java.util.List;
import static org.junit.Assert.*;
public class UserServiceTest {
@Test
public void insertUser() throws Exception {
SqlSession session = DBTools.getSession();
UserMapper mapper = session.getMapper(UserMapper.class);
UserBean user = new UserBean("咖啡", "1314520", 7000.0);
try {
mapper.insertUser(user);
System.out.println(user.toString());
session.commit();
} catch (Exception e) {
e.printStackTrace();
session.rollback();
}
}
@Test
public void deleteUser() throws Exception {
SqlSession session=DBTools.getSession();
UserMapper mapper=session.getMapper(UserMapper.class);
try {
mapper.deleteUser(1);
session.commit();
} catch (Exception e) {
e.printStackTrace();
session.rollback();
}
}
@Test
public void selectUserById() throws Exception {
SqlSession session=DBTools.getSession();
UserMapper mapper=session.getMapper(UserMapper.class);
try {
UserBean user= mapper.selectUserById(2);
System.out.println(user.toString());
session.commit();
} catch (Exception e) {
e.printStackTrace();
session.rollback();
}
}
@Test
public void selectAllUser() throws Exception {
SqlSession session=DBTools.getSession();
UserMapper mapper=session.getMapper(UserMapper.class);
try {
List user=mapper.selectAllUser();
System.out.println(user.toString());
session.commit();
} catch (Exception e) {
e.printStackTrace();
session.rollback();
}
}
}
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