標籤：java 載入 ack tor sch ber 使用 number 開發
Spring整合MyBatis （使用掃描包配置mapper代理）
pojo是根據表產生的實體類，屬性名稱要跟欄位名相同，不相同sql語句查詢時用別名。
首先導jar包
實體類
public class User { private Integer id; private String username;// 使用者姓名 private String sex;// 性別 private Date birthday;// 生日 private String address;// 地址}第一步：
編寫MyBatis設定檔SqlMapConfig.xml（雖然裡面可以什麼也不寫除了頭，但是必須有）。
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration></configuration>第二步：
編寫Spring 設定檔applicationContext.xml
(db.properties：檔案裡面放的是串連資料庫的相關資訊。jdbc.driver=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/t003?characterEncoding=utf-8jdbc.username=test01jdbc.password=) <?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <!-- 載入設定檔 --> <context:property-placeholder location="classpath:db.properties" /> <!-- 資料庫連接池 --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="${jdbc.driver}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <property name="maxActive" value="10" /> <property name="maxIdle" value="5" /> </bean> <!-- sqlSessonFactory的配置 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 設定資料庫串連池 --> <property name="dataSource" ref="dataSource"></property> <!-- 載入設定檔 --> <property name="configLocation" value="classpath:SqlMapConfig.xml"></property> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" > <property name="basePackage" value="cn.test" /> </bean></beans>第四步編寫介面相對應的xml檔案UserMapper.xml
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><!-- namespace是命名空間，作用sql語句的隔離，後面還有重要作用 #{}作用就是預留位置，相當於jdbc的“?” parameterType：查詢的參數類型 resultType：查詢結果的資料類型，如果給pojo應該給全路徑。 --><!-- mapper代理的開發規則： 1、namespace必須時候介面的全限定名 2、Statementid必須和介面的方法名稱一致 3、介面方法的參數類型要和parameterType要一致 4、介面方法的傳回值類型要和resultType一致 --><mapper namespace="cn.test.mybatis.po.UserMapper"> <!-- 別名不區分大小寫 --> <select id="getUserById" parameterType="int" resultType="cn.test.mybatis.po.User"> SELECT * FROM `user` WHERE id=#{id}; </select> <!-- 如果查詢結果返回list， resultType設定為list中一個元素的資料類型 ${}字串拼接指令 --> <select id="getUserByName" parameterType="string" resultType="cn.test.mybatis.po.User"> SELECT * FROM `user` WHERE username LIKE ‘%${value}%‘ </select> <!-- 美麗的分界線 只測試最簡單的上邊兩個方法 --> <!-- 參數為pojo時，#{}中的名稱就是pojo的屬性 --> <!-- <insert id="insertUser" parameterType="cn.test.mybatis.po.User"> keyProperty：對於pojo的主鍵屬性 resultType:對應主鍵的資料類型 order：是在insert語句執行之前或者之後。 如果使用uuid做主鍵，應該先產生主鍵然後插入資料，此時應該使用Before <selectKey keyProperty="id" resultType="int" order="AFTER"> SELECT LAST_INSERT_ID() </selectKey> INSERT into user (username,birthday,sex,address) values (#{username}, #{birthday}, #{sex}, #{address}) </insert> --> <!-- <select id="getUserByQueryVo" parameterType="queryvo" resultType="user"> SELECT * FROM `user` WHERE id=#{user.id}; </select> --> <!-- 查詢使用者表中的記錄數 --> <!-- <select id="getUserCount" resultType="int"> SELECT count(*) FROM `user` </select> <sql id="find_user_list_where"> <where> <if test="id!=null"> and id=#{id} </if> <if test="username != null and username != ‘‘"> and username like ‘%${username}%‘ </if> </where> </sql> <sql id="user_field_list"> id,username,birthday,sex,address </sql> --><!-- <select id="findUserList" parameterType="user" resultType="user"> select <include refid="user_field_list" /> from user <include refid="find_user_list_where" /> </select> --> <!-- 動態sql foreach測試 --> <!-- <select id="findUserByIds" parameterType="queryvo" resultType="user"> SELECT <include refid="user_field_list" /> FROM `user` <where> and id in(1,10,20,21,31) <foreach collection="ids" item="id" open="and id in(" close=")" separator=","> #{id} </foreach> </where> </select> --></mapper>最後測試
public class MyBatisTest { private ApplicationContext applicationContext; @Before public void init() throws Exception { // 初始化spring容器 applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext.xml"); } @Test public void testFindUserById() { UserMapper userMapper = applicationContext.getBean(UserMapper.class); List<User> user = userMapper.getUserByName("王五"); for (User user2 : user) { System.out.println(user2.getUsername()); } } @Test public void test() { UserMapper userMapper = applicationContext.getBean(UserMapper.class); User userById = userMapper.getUserById(1); System.out.println(userById); }}Spring整合MyBatis （使用掃描包配置mapper代理）
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
