Pre
如果MyBatis的基础用法还不熟悉，31篇入门博客拿走不谢
戳戳戳 —> https://blog.csdn.net/yangshangwei/category_7205317.html
工程概览
pom.xml
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.artisan</groupId> <artifactId>mybatisSource</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.17</version> <scope>runtime</scope> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.1</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> </dependencies> <build> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> <resource> <directory>src/test/java</directory> <includes> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> </resources> </build> </project>
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> <properties resource="app.properties"> </properties> <settings> <setting name="mapUnderscoreToCamelCase" value="true"/> </settings> <typeAliases> </typeAliases> <environments default="dev"> <environment id="dev"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </dataSource> </environment> </environments> <mappers> <package name="com.artisan"/> </mappers> </configuration>
UserMapper
package com.artisan; import com.artisan.bean.User; import org.apache.ibatis.annotations.Select; public interface UserMapper { @Select({"select * from users where id = #{id}"}) User selectByid(Integer id); }
测试类
基类
import org.apache.ibatis.session.Configuration; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import org.junit.Before; /** * 基类 */ public class BaseTest { public SqlSessionFactory factory; public Configuration configuration; @Before public void inin(){ // 获取构建器 SqlSessionFactoryBuilder factoryBuilder = new SqlSessionFactoryBuilder(); // 解析xml ,构建会话工厂 factory = factoryBuilder.build(SqlSessionTest.class.getResourceAsStream("/mybatis-config.xml")); // 获取 configuration 这个大管家 configuration = factory.getConfiguration(); } }
SqlSessionTest 测试类
package com.artisan; import com.artisan.bean.User; import org.apache.ibatis.mapping.MappedStatement; import org.apache.ibatis.session.ExecutorType; import org.apache.ibatis.session.SqlSession; import org.junit.Test; import java.util.List; public class SqlSessionTest extends BaseTest{ private MappedStatement ms; @Test public void sqlSessionTest(){ // 获取statement SQL映射 ms = configuration.getMappedStatement("com.artisan.UserMapper.selectByid"); // 开启会话 第一个参数 执行器类型 第二个参数 是否自动提交 SqlSession sqlSession = factory.openSession(ExecutorType.SIMPLE, true); // 门面模式 屏蔽了底层调用的复杂用 统一对接sqlSession List<User> users = sqlSession.selectList(ms.getId(), 1); System.out.println(users.get(0)); } }
测试结果：
selectList 源码解析
附
SQL
/* Navicat MySQL Data Transfer Source Server : localhost_root Source Server Version : 80011 Source Host : 127.0.0.1:3306 Source Database : artisan Target Server Type : MYSQL Target Server Version : 80011 File Encoding : 65001 Date: 2020-06-14 00:46:05 */ SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for `users` -- ---------------------------- DROP TABLE IF EXISTS `users`; CREATE TABLE `users` ( `id` int(11) NOT NULL, `name` varchar(255) DEFAULT NULL, `age` varchar(255) DEFAULT NULL, `sex` varchar(255) DEFAULT NULL, `email` varchar(255) DEFAULT NULL, `phoneNumber` varchar(255) DEFAULT NULL, `createTime` date DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of users -- ---------------------------- INSERT INTO `users` VALUES ('1', 'artisan', '11', 'male', '123@qq.com', '12345', '2020-06-04');
log4j.properties
### set log levels ### log4j.rootLogger = DEBUG ,stdout ### log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target = System.out log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern = %d{ABSOLUTE} %5p %c:%L - %m%n
app.properties
jdbc.driver=com.mysql.cj.jdbc.Driver jdbc.url=jdbc:mysql://127.0.0.1:3306/artisan?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT jdbc.username=root jdbc.password=root default.environment=dev
User
package com.artisan.bean; import java.util.Date; public class User implements java.io.Serializable { private Integer id; private String name; private String age; private String sex; private String email; private String phoneNumber; private Date createTime; public User() { } public User(Integer id, String name) { this.id = id; this.name = name; } ....省略 set/get .... }
