mybaties简单测试

导入 mybaties-3.3.1.jar包
导入mysql-connector-java.jar包

首先mybaties配置文件配置数据连接相关信息

<?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>

<!-- 类别名定义 -->
<typeAliases>
<typeAlias type="com.yjm.entry.TestData" alias="testdata123"/>
</typeAliases>

<!-- 配置Mybatis的环境，事务及数据源等等 -->
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://127.0.0.1:3306/test" />
<property name="username" value="root" />
<property name="password" value="1234" />
</dataSource>
</environment>
</environments>
<!-- 指定映射文件或者映射类 -->
<mappers>
<mapper resource="com/yjm/mapper/testdatamapper.xml" />
</mappers>
</configuration>

编写实体类与实体类的查询接口具体查询映射文件

package com.yjm.entry;

public class TestData {

private String id;
private String name;
private String password;

/**
* @param id
*            the id to set
*/
public void setId(String id) {
this.id = id;
}

/**
* @return the id
*/
public String getId() {
return id;
}

/**
* @param name
*            the name to set
*/
public void setName(String name) {
this.name = name;
}

/**
* @return the name
*/
public String getName() {
return name;
}

/**
* @param password
*            the password to set
*/
public void setPassword(String password) {
this.password = password;
}

/**
* @return the password
*/
public String getPassword() {
return password;
}

}

package com.yjm.mapper;

import com.yjm.entry.TestData;

public interface TestDataMapper {

public void insertData(TestData testData);
//	public TestData selectData(String id);

}

<?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="com.yjm.mapper.TestDataMapper">
<insert id="insertData" parameterType="testdata123" flushCache="true">
INSERT INTO testdata(id,name,password)
values(#{id},#{name},#{password})
</insert>
</mapper>

上面一个是实体类查询接口，一个是实体类查询接口的具体实现xml。
使用xml来实现实体类的查询接口查询语句。方便编写

下面是测试

package com.yjm.test;

import java.io.InputStream;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import com.yjm.entry.TestData;
import com.yjm.mapper.TestDataMapper;

public class TestDa {

public static void main(String[] args) {
InputStream is = TestDa.class.getResourceAsStream("/mybaties-config.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
SqlSession sqlsession = sqlSessionFactory.openSession();
TestDataMapper testDataMapper=sqlsession.getMapper(TestDataMapper.class);
TestData test = new TestData();
test.setId("id");
test.setName("name");
test.setPassword("password");
testDataMapper.insertData(test);
sqlsession.commit();

}

}

有一点mybaties没有找到获取事务对象。来设置事务启用是否自动提交

package com.yjm.test;

import java.io.InputStream;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import com.yjm.entry.TestData;
import com.yjm.mapper.TestDataMapper;

public class TestDa {

public static void main(String[] args) {
InputStream is = TestDa.class.getResourceAsStream("/mybaties-config.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
SqlSession sqlsession = sqlSessionFactory.openSession();
TestDataMapper testDataMapper=sqlsession.getMapper(TestDataMapper.class);
TestData test = new TestData();
test.setId("id");
test.setName("name");
test.setPassword("password");
testDataMapper.insertData("sdqf","df","gdg");
sqlsession.commit();

}

}

package com.yjm.mapper;

import org.apache.ibatis.annotations.Param;

import com.yjm.entry.TestData;

public interface TestDataMapper {

public void insertData(@Param("id1")String id ,@Param("name")String name,@Param("password")String password);
//public TestData selectData(String id);

}

需要加@param来传递数据，xml配置文件里只能接受一个参数，所以需要改成map形式的，将String映射成map类型

返回map 报错

public Map<String,TestData> selectData(String password);

Exception in thread "main" org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 5

正确写法

public List<Map<String,TestData>> selectData(String password);

或者 public List<TestData> selectData(String password);

Mybatis返回的Map是这样的一种格式：Map<字段名称，字段值>

一个Map<字段名，字段值>对象代表一行数据

返回多行数据是多个Map，多个Map放在List中只能返回一个参数对象