项目结构和需要导入的jar包:
【一】User表:
【二】实体类User.java(com.mybatis.pojo)
package com.mybatis.pojo;
import java.io.Serializable;
import java.util.Date;
/**
* 用户类:包含id,姓名,性别,生日,地址属性。
*/
public class User implements Serializable {
private static final long serialVersionUID = 1L;
private Integer id;
private String username;
private String sex;
private Date birthday;
private String address;
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 getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", sex=" + sex
+ ", birthday=" + birthday + ", address=" + address + "]";
}
}
【三】用户类配置文件User.xml(位于sqlmap包下)
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="user">
<!--
#{}:占位符(预编译)
${}:字符串拼接
注意:用$符号时候里面只能用value这个名字
-->
<select id="findUserByName" parameterType="String" resultType="com.mybatis.pojo.User">
select * from user where username like '%${value}%'
</select>
</mapper>
【四】mybatis配置文件sqlMapConfig.xml(位于src下)
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 只在mybatis单独使用时这样用 -->
<environments default="development">
<environment id="development">
<!-- 使用jdbc事务管理 -->
<transactionManager type="JDBC" />
<!-- 数据库连接池 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url"
value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8" />
<property name="username" value="root" />
<property name="password" value="123456" />
</dataSource>
</environment>
</environments>
<!-- Mapper的位置 -->
<mappers>
<mapper resource="sqlmap/User.xml"/>
</mappers>
</configuration>
【五】log4j.properties(用于日志信息输出)
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
【六】单元测试类MybatisTest.java(com.mybatis.test):
package com.mybatis.test;
import java.io.InputStream;
import java.util.List;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import com.mybatis.pojo.User;
public class MybatisTest {
/**
* 通过姓名模糊查询查询用户集
* @throws Exception
*/
@Test
public void findUserByName() throws Exception{
// 加载核心配置文件
String resource = "sqlMapConfig.xml";
InputStream in = Resources.getResourceAsStream(resource);
// 创建SqlSessionFactory
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
// 创建SqlSession
SqlSession sqlSession = sqlSessionFactory.openSession();
// 执行sql语句
List<User> users = sqlSession.selectList("user.findUserByName", "小");
for (User user : users) {
System.out.println(user);
}
}
}
运行结果: