Mybatis 使用（一）
一个基于mybits实现的简单的CRUD功能：
1.创建测试表：
create table t_fruit(id number(8),name varchar2(50),price float(10));
2.创建实体类
package com.mybatistest.orm;
import java.io.Serializable;
public class Fruit implements Serializable {
private static final long serialVersionUID = 1L;
private int id;
private String name;
private Float price;
public Fruit() {
}
public Fruit(int id, String name, Float price) {
this.id = id;
this.name = name;
this.price = price;
}
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 Float getPrice() {
return price;
}
public void setPrice(Float price) {
this.price = price;
}
@Override
public String toString() {
return "水果名称:" + name + " 单价:" + price +"/kg";
}
}
3.创建实体映射接口
package com.mybatistest.orm;
import java.util.List;
import org.apache.ibatis.annotations.Param;
public interface FruitMapper {
public int insertFruit(Fruit fruit);
public int deleteFruit(int id);
public int updateFruit(@Param(value = "fruit") Fruit fruit);
public List<Fruit> queryList(@Param(value = "fruit") Fruit fruit);
}
4.创建映射配置文件
<?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.mybatistest.orm.FruitMapper">
<!--id 名称需要与FruitMaper类中的方法名字相同 -->
<insert id="insertFruit" parameterType="Fruit">
insert into
t_fruit(id,name,price) values(#{id},#{name},#{price})
</insert>
<!-- 修改数据 -->
<update id="updateFruit" parameterType="Fruit">
update t_fruit
<set>
<if test="fruit.name != null and fruit.name !='' ">name=#{fruit.name},</if>
<if test="fruit.price != null and fruit.price!='' ">price=#{fruit.price}</if>
</set>
where id=#{fruit.id}
</update>
<!-- 删除数据 -->
<delete id="deleteFruit" parameterType="java.lang.Integer">
delete from t_fruit where id=#{id}
</delete>
<!-- 查询数据 -->
<select id="queryList" resultType="Fruit">
select * from t_fruit where 1=1
<if test="fruit.id!='' and fruit.id!=null ">
and age=#{fruit.id}
</if>
<if test="fruit.name!='' and fruit.name!=null ">
and name=#{fruit.name}
</if>
<if test="fruit.price!='' and fruit.price!=null ">
and age=#{fruit.price}
</if>
</select>
</mapper>
5.创建数据库连接文件，并将映射配置文件加入其中
<?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> <typeAliases> <typeAlias alias="Fruit" type="com.mybatistest.orm.Fruit" /> </typeAliases> <environments default="development"> <environment id="development"> <transactionManager type="JDBC" /> <dataSource type="POOLED"> <property name="driver" value="oracle.jdbc.driver.OracleDriver" /> <property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:orcl" /> <property name="username" value="****" /> <property name="password" value="*******" /> </dataSource> </environment> </environments> <mappers> <mapper resource="com/mybatistest/orm/FruitMapper.xml" /> </mappers> </configuration>
6.创建java测试类
package com.mybatistest.test;
import java.io.IOException;
import java.io.Reader;
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 com.mybatistest.orm.Fruit;
import com.mybatistest.orm.FruitMapper;
public class LauncherFruit {
private final static SqlSessionFactory sqlSessionFactory;
static {
String resource = "com/mybatistest/test/mybatis-config.xml";
Reader reader = null;
try {
reader = Resources.getResourceAsReader(resource);
} catch (IOException e) {
System.out.println("Msg:" + e.getMessage());
}
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
}
/**
* 添加数据
*/
public static void addFruit() {
SqlSession sqlSession = sqlSessionFactory.openSession();
try {
FruitMapper fruitMapper = sqlSession.getMapper(FruitMapper.class);
Fruit fruit = new Fruit(3, "桃子", new Float(1.3));
int result = fruitMapper.insertFruit(fruit);
sqlSession.commit();// 不要忘记提交
if (result > 0) {
System.out.println("{'success:',true}");
}
} finally {
sqlSession.close();
}
};
/**
* 修改数据
*/
public static void updateFruit() {
SqlSession sqlSession = sqlSessionFactory.openSession();
try {
FruitMapper fruitMapper = sqlSession.getMapper(FruitMapper.class);
Fruit fruit = new Fruit(3, "香蕉", new Float(1.6));
int result = fruitMapper.updateFruit(fruit);
sqlSession.commit();
if (result > 0) {
System.out.println("{'success:',true}");
}
} finally {
sqlSession.close();
}
};
/**
* 查询数据
*/
public static void queryFruit() {
SqlSession sqlSession = sqlSessionFactory.openSession();
try {
FruitMapper fruitMapper = sqlSession.getMapper(FruitMapper.class);
Fruit fruit = new Fruit();
List<Fruit> fruitList = fruitMapper.queryList(fruit);
for (int i = 0; i < fruitList.size(); i++) {
System.out.println(fruitList.get(i).toString());
}
} finally {
sqlSession.close();
}
}
/**
* 删除数据
*/
public static void deleteFruit() {
SqlSession sqlSession = sqlSessionFactory.openSession();
try {
FruitMapper fruitMapper = sqlSession.getMapper(FruitMapper.class);
int result = fruitMapper.deleteFruit(1);
sqlSession.commit();
if (result > 0) {
System.out.println("{'success:',true}");
}
} finally {
sqlSession.close();
}
}
public static void main(String[] args) throws IOException {
// addFruit();
queryFruit();
// updateFruit();
// deleteFruit();
}
}