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limenlimen
committedApr 8, 2020
mybatis demo
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‎.gitignore

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.idea/
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target/

‎pom.xml

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<artifactId>basics</artifactId>
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<version>1.0-SNAPSHOT</version>
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<!-- 使用阿里云中心仓库 -->
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<repositories>
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<repository>
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<id>aliyun</id>
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<name>aliyun</name>
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<url>http://maven.aliyun.com/nexus/content/groups/public</url>
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</repository>
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</repositories>
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<pluginRepositories>
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<pluginRepository>
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<id>aliyun</id>
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<name>aliyun</name>
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<url>http://maven.aliyun.com/nexus/content/groups/public</url>
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</pluginRepository>
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</pluginRepositories>
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<dependencies>
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<dependency>
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<groupId>org.mybatis.spring.boot</groupId>
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<artifactId>mybatis-spring-boot-starter</artifactId>
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<version>1.3.2</version>
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</dependency>
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>8.0.15</version>
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<scope>runtime</scope>
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</dependency>
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</dependencies>
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</project>

‎src/main/java/com/limengxiang/basics/MybatisDemo.java

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package com.limengxiang.basics;
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import com.limengxiang.basics.dao.UserDAO;
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import com.limengxiang.basics.model.UserModel;
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import org.apache.ibatis.io.Resources;
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import org.apache.ibatis.session.SqlSession;
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import org.apache.ibatis.session.SqlSessionFactoryBuilder;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.List;
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public class MybatisDemo {
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public static void main(String[] args) {
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try {
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InputStream stream = Resources.getResourceAsStream("mybatis-config.xml");
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SqlSession sqlSession = new SqlSessionFactoryBuilder().build(stream).openSession(true);
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UserDAO userDAO = sqlSession.getMapper(UserDAO.class);
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// 插入数据
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Integer inserted = userDAO.insert("allen", "13356986723");
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System.out.println("Insert result:" + inserted);
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inserted = userDAO.insert("alfred", "13856986723");
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System.out.println("Insert result:" + inserted);
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UserModel user = userDAO.selectOne("users", 1);
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System.out.println("Select one:" + user);
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List<UserModel> users = userDAO.fuzzySearch("all%", "");
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System.out.println("Fuzzy search by username:" + users);
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users = userDAO.fuzzySearch("", "133%");
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System.out.println("Fuzzy search by mobile:" + users);
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users = userDAO.fuzzySearch("all%", "133%");
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System.out.println("Fuzzy search by username and mobile:" + users);
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users = userDAO.searchByUsernameOrMobile("all%", "135%");
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System.out.println("Search by username:" + users);
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users = userDAO.searchByUsernameOrMobile("", "135%");
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System.out.println("Search by mobile:" + users);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}

‎src/main/java/com/limengxiang/basics/dao/UserDAO.java

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package com.limengxiang.basics.dao;
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import com.limengxiang.basics.model.UserModel;
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import org.apache.ibatis.annotations.Mapper;
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import org.apache.ibatis.annotations.Param;
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import java.util.List;
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@Mapper
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public interface UserDAO {
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public Integer insert(@Param("username") String username, @Param("mobile") String mobile);
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public UserModel selectOne(@Param("tableName") String tableName, @Param("id") Integer id);
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public List<UserModel> fuzzySearch(@Param("username") String username, @Param("mobile") String mobile);
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public List<UserModel> searchByUsernameOrMobile(@Param("username") String username, @Param("mobile") String mobile);
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}

‎src/main/java/com/limengxiang/basics/model/UserModel.java

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package com.limengxiang.basics.model;
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public class UserModel {
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private String username;
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private String mobile;
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public String toString() {
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return "username:" + username +
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", mobile:" + mobile;
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}
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}

‎src/main/resources/mapper/UserMapper.xml

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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<!-- mapper:根标签，namespace：命名空间，也就是DAO类 -->
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<mapper namespace="com.limengxiang.basics.dao.UserDAO">
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<!-- 插入数据 -->
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<insert id="insert" parameterType="com.limengxiang.basics.model.UserModel">
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INSERT INTO users (username,mobile) VALUES (#{username}, #{mobile})
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</insert>
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<!-- 按主键ID查询 -->
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<select id="selectOne" resultType="com.limengxiang.basics.model.UserModel">
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SELECT * FROM ${tableName} WHERE id = #{id}
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</select>
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<!-- 动态SQL，当参数非空时模糊匹配 -->
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<select id="fuzzySearch" resultType="com.limengxiang.basics.model.UserModel">
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SELECT * FROM users
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<!-- 不用担心多余的AND -->
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<where>
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<if test="username!=null and username.trim()!=''">AND username LIKE #{username}</if>
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<if test="mobile!=null and mobile.trim()!=''">AND mobile LIKE #{mobile}</if>
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</where>
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</select>
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<!-- 动态SQL，类似switch语句 -->
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<select id="searchByUsernameOrMobile" resultType="com.limengxiang.basics.model.UserModel">
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SELECT * FROM users
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<where>
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<!-- 不用担心多余的AND -->
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<choose>
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<when test="username!=null and username.trim()!=''">
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AND username LIKE #{username}
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</when>
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<when test="mobile!=null and mobile.trim()!=''">
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AND mobile LIKE #{mobile}
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</when>
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</choose>
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</where>
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</select>
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</mapper>

‎src/main/resources/mybatis-config.xml

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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE configuration
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PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-config.dtd">
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<!-- 根标签 -->
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<configuration>
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<properties>
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<property name="driver" value="com.mysql.cj.jdbc.Driver"/>
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</properties>
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<!-- 环境，可以配置多个，default：指定采用哪个环境 -->
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<environments default="development">
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<!-- id：唯一标识 -->
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<environment id="development">
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<!-- 事务管理器，JDBC类型的事务管理器 -->
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<transactionManager type="JDBC" />
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<!-- 数据源，池类型的数据源 -->
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<dataSource type="POOLED">
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<property name="driver" value="${driver}" /> <!-- 配置了properties，所以可以直接引用 -->
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<property name="url" value="jdbc:mysql://172.168.0.92:3306/mybatis_demo"/>
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<property name="username" value="root"/>
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<property name="password" value="123456"/>
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</dataSource>
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</environment>
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</environments>
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<mappers>
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<mapper resource="mapper/UserMapper.xml" />
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</mappers>
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</configuration>

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