mybatis框架使用

其他 2018-08-29 10:11:18 阅读次数: 0

目录

jar包

配置文件

以上就是基本mybatis开发的过程

动态SQL

jar包

jar包下载

配置文件

外置资源文件database.properties

driver=com.mysql.jdbc.Driver
url=jdbc\:mysql\://localhost\:3306/smbms?useUnicode\=true&characterEncoding\=utf8
user=root
pwd=123

总配置文件mybatis-config.xml

<?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>
	<!--设置外置配置文件-->
	<properties resource="database.properties"></properties>
	
	<!--设置各种参数，包括类别名-->
	<settings>
        <setting name="logImpl" value="LOG4J" />
    </settings>
	
	<!--设置类别名  p29-->
	<typeAliases>
		<package name="cn.smbms.entity"/>
	</typeAliases>
	
	<!--p30  -->
	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC" />
			<!-- 配置数据库连接信息 -->
			<dataSource type="POOLED">
				<property name="driver" value="${driver}" />
				<property name="url" value="${url}" />
				<property name="username" value="${user}" />
				<property name="password" value="${pwd}" />
			</dataSource>
		</environment>
	</environments>

	<!--p31  -->
	<mappers>
		<!-- 注册userMapper.xml文件， userMapper.xml位于me.gacl.mapping这个包下，所以resource写成me/gacl/mapping/userMapper.xml -->
		<mapper resource="cn/smbms/dao/user/UserMapper.xml"/>
		<mapper resource="cn/smbms/dao/role/RoleMapper.xml"/>
		<mapper resource="KET/KETMapper.xml"/>
	</mappers>
</configuration>

日志文件log4j.properties

# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# MyBatis logging configuration...
log4j.logger.org.mybatis.example.BlogMapper=DEBUG
# 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

xml配置文件头部GoodsMapper.xml

<?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">

xml完整文件GoodsMapper.xml

<?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.bdqn.dao.ElectronicMapper">
	<select id="findAll" resultType="Electronic">
		select * from electronic
	</select>
</mapper>

对应的dao接口GoodsMapper.java

package com.bdqn.dao;

import java.util.List;

import com.bdqn.entity.Goods;

public interface  GoodsMapper {
	public List<Goods> findAllGoods();
	
}

测试类：Test.java

工具类：可以把获取链接的过程封装成一个工具类

package com.bdqn.utils;

import java.io.IOException;
import java.io.InputStream;

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 MyBatis {
    //定义一个factory
	private static SqlSessionFactory factory;
    //静态代码块，项目开始先执行一次，读取配置文件，给sqlsessionfactoty赋值
	static{
		InputStream is;
		try {
			is = Resources.getResourceAsStream("mybatis-config.xml");
			factory = new SqlSessionFactoryBuilder().build(is);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
    //静态方法，只需类名点方法名就能获取sqlsession
	public static SqlSession createSqlSession(){
		return factory.openSession(false);//true为自动提交事务
	}
	//关闭sqlsession
	public static void closeSqlSession(SqlSession session){
		if (null!=session) {
			session.close();
		}
	}
	
}

test类

package text;

import java.util.List;

import org.apache.ibatis.session.SqlSession;

import com.bdqn.dao.GoodsMapper;
import com.bdqn.entity.Goods;
import com.bdqn.utils.MyBatis;

public class Test {
public static void main(String[] args) {
	SqlSession session = MyBatis.createSqlSession();
	List<Goods> list = 
			session.getMapper(GoodsMapper.class).findAllGoods();
	for (Goods goods : list) {
		System.out.println(goods.getId());
		System.out.println(goods.getName());
		System.out.println(goods.getPrice());
	}
}
}

以上就是基本mybatis开发的过程

接下来还有些要补充的的东西

根据传入的参数不同可以分成四种

    //无参
	List<Goods> FindAllxx();
	//单个参数
	List<Goods> FindAll1(String name);
	//使用注解传入对应的参数--多个参数
	List<Goods> FindAll2(@Param("name3") String name,@Param("price3") double price);
	//对象参数
	List<Goods> FindAll3(Goods goods);
	//集合参数
	List<Goods> FindAll4(Map<String, Object> map);

参数返回类型resultMap

    <!-- 使用resultmap映射查询结果集 -->
	<resultMap type="provider" id="proMAP">
		<result property="proName" column="proName"/>
		<result property="billName" column="productName"/>
	</resultMap>
	
	<!-- 用resultMap结果映射来控制输出的内容 -->
	<select id="findAllSSS" resultMap="proMAP">
		SELECT * FROM smbms_provider p,smbms_bill b WHERE p.id = b.providerId
	</select>

resultMap包含一对一association的链接查询

    <!-- 上机练习3 p59 -->
	<resultMap type="Bill" id="selectMap2">
	
		<id property="id" column="id"/>
		<result property="billCode" column="billCode"/>
		<result property="productName" column="productName"/>
		<result property="totalPrice" column="totalPrice"/>
		<result property="isPayment" column="isPayment"/>
		<!-- 这里的property是实体类的属性名，后面那个是对应的类名 -->
		<association property="provider" javaType="Provider">
			<result property="proCode" column="proCode"/>
			<result property="proName" column="proName"/>
			<result property="proContact" column="proContact"/>
			<result property="proPhone" column="proPhone"/>
		</association>
		
	</resultMap>
	<select id="selectBill_2" resultMap="selectMap2">
		SELECT * FROM smbms_bill b,smbms_provider p WHERE b.providerId = 
		p.id AND b.productName LIKE "%"#{productName}"%" AND b.isPayment = #{isPayment}
		AND p.id=#{providerId}
	</select>




        <association property="classes" javaType="one.to.many.Classes">
            <id column="cid" property="cid"/>
            <result column="cname" property="cname"/>
        </association>

resultMap包含多对一collection的链接查询查看一对一和一对多

    <!-- 上机练习4 -->
	<resultMap type="Provider" id="selectPro">
		<id property="id" column="id"/>
		<result property="proCode" column="proCode"/>
		<result property="proName" column="proName"/>
		<result property="proContact" column="proContact"/>
		<result property="proPhone" column="proPhone"/>
		<collection property="bills" ofType="Bill">
		   <!--  注意这里的区分可以用任何符号来区分，只要不是id -->
			<id property="id" column="-id"/>
			<result property="billCode" column="billCode"/>
			<result property="productName" column="productName"/>
			<result property="totalPrice" column="totalPrice"/>
			<result property="isPayment" column="isPayment"/>
		</collection>
	</resultMap >
	<select id="selectP" resultMap="selectPro">
		SELECT * FROM smbms_provider p,smbms_bill b WHERE p.id= #{id} AND p.id=b.providerId
	</select>





    <collection property="students" ofType="one.to.many.Student">
            <id column="sid" property="sid"/>
            <result column="sname" property="sname"/>
        </collection>

动态SQL

<!-- 动态SQL p77  上机练习3 -->
	<update id="updateProvider3333" parameterType="provider">
		UPDATE smbms_provider 
		<set>
			<if test="proCode!=null">proCode=#{proCode},</if>
			<if test="proName!=null">proName=#{proName},</if>
			<if test="proDesc!=null">proDesc=#{proDesc},</if>
			<if test="proContact!=null">proContact=#{proContact},</if>
			<if test="proPhone!=null">proPhone=#{proPhone},</if>
			<if test="proAddress!=null">proAddress=#{proAddress},</if>
			<if test="proFax!=null">proFax=#{proFax},</if>
			<if test="createdBy!=null">createdBy=#{createdBy},</if>
			<if test="creationDate!=null">creationDate=#{creationDate},</if>
			<if test="modifyBy!=null">modifyBy=#{modifyBy},</if>
			<if test="modifyDate!=null">modifyDate={modifyDate},</if>
		</set>
		WHERE id=#{id}
	</update>
<!-- 动态SQL p72 -->
	<select id="findAll3333" resultType="provider" parameterType="provider">
		select * from smbms_provider 
		<where>
		<if test="proName!=null and proName!=''">
			and proName LIKE "%"#{proName}"%"
		</if>
		<if test="proCode!=null and proCode!=''">
			and proCode = #{proCode}
		</if>
		</where> 
	</select>
<!-- p88页上机练习7  使用choose语句查询供应商列表 -->
	<select id="selectPR88" resultType="Provider">
		select * from smbms_provider where 1=1 
		<choose>
			<when test="proCode!=null and proCode!=''">
				and proCode like "%"#{proCode}"%"
			</when>
			<when test="proName!=null and proName!=''">
				and proName like "%"#{proName}"%"
			</when>
			<when test="proContact!=null and proContact!=''">
				and proContact like "%"#{proContact}"%"
			</when>
			<otherwise>
				and creationDate > "2018-01-01 00:00:00"
			</otherwise>
		</choose>
	</select>
<update id="updateProvider4444" parameterType="provider">
		UPDATE smbms_provider 
		<trim prefix="set"  suffixOverrides="," suffix="WHERE id=#{id}">
			<if test="proCode!=null">proCode=#{proCode},</if>
			<if test="proName!=null">proName=#{proName},</if>
			<if test="proDesc!=null">proDesc=#{proDesc},</if>
			<if test="proContact!=null">proContact=#{proContact},</if>
			<if test="proPhone!=null">proPhone=#{proPhone},</if>
			<if test="proAddress!=null">proAddress=#{proAddress},</if>
			<if test="proFax!=null">proFax=#{proFax},</if>
			<if test="createdBy!=null">createdBy=#{createdBy},</if>
			<if test="creationDate!=null">creationDate=#{creationDate},</if>
			<if test="modifyBy!=null">modifyBy=#{modifyBy},</if>
			<if test="modifyDate!=null">modifyDate={modifyDate},</if>
		</trim>
		
	</update>
<select id="selectP333" resultMap="selectPro1">
		<foreach collection="list" open="("  separator="," close=")" item="list">
		#{list}
		</foreach>
	</select>

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