前言
开博客这是第一次写系列文章，从内心上讲是有点担心自己写不好，写不全，毕竟是作为java/mybatis学习的过程想把学习的路线和遇到的问题都总结下来，也让知识点在脑海里能形成一个体系。
开发环境
idea2016、mybatis3、SQLServer2012
pom.xml、mybatis.xml、log4j.properties
先贴上pom.xml是因为他直接和搭建开发环境和测试环境有关系，mybatis.xml则是连接数据库，log4j.properties在学习阶段配置上有助于我们观察SQL的执行情况。
1、pom.xml
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<dependencies> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.2</version> </dependency> <dependency> <groupId>com.microsoft.sqlserver</groupId> <artifactId>sqljdbc4</artifactId> <version>4.0</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.10</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> </dependencies> |
2、mybatis.xml
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<?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> <!-- MyBatis针对SqlServer进行的配置 --> <typeAliases> <typeAlias alias="User" type="com.autohome.model.User"/> <typeAlias alias="Teacher" type="com.autohome.model.Teacher" /> <typeAlias alias="Student" type="com.autohome.model.Student" /> </typeAliases> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"/> <property name="url" value="jdbc:sqlserver://localhost:1433;DatabaseName=test"/> <property name="username" value="sa"/> <property name="password" value="0"/> </dataSource> </environment> </environments> <mappers> <mapper resource="mapper/User.xml"/> <mapper resource="mapper/Student.xml"/> </mappers></configuration> |
3、log4j.properties
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### Log4j配置 ###### 与Spring结合需要在web.xml中指定此文件位置，并添加监听器 ####定义log4j的输出级别和输出目的地（目的地可以自定义名称，和后面的对应）#[ level ] , appenderName1 , appenderName2log4j.rootLogger=DEBUG,console,file#-----------------------------------##1 定义日志输出目的地为控制台log4j.appender.console = org.apache.log4j.ConsoleAppenderlog4j.appender.console.Target = System.outlog4j.appender.console.Threshold=DEBUG####可以灵活地指定日志输出格式，下面一行是指定具体的格式 ####%c: 输出日志信息所属的类目，通常就是所在类的全名#%m: 输出代码中指定的消息,产生的日志具体信息#%n: 输出一个回车换行符，Windows平台为"/r/n"，Unix平台为"/n"输出日志信息换行log4j.appender.console.layout = org.apache.log4j.PatternLayoutlog4j.appender.console.layout.ConversionPattern=[%c]-%m%n#-----------------------------------##2 文件大小到达指定尺寸的时候产生一个新的文件log4j.appender.file = org.apache.log4j.RollingFileAppender#日志文件输出目录log4j.appender.file.File=log/tibet.log#定义文件最大大小log4j.appender.file.MaxFileSize=10mb###输出日志信息####最低级别log4j.appender.file.Threshold=ERRORlog4j.appender.file.layout=org.apache.log4j.PatternLayoutlog4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n#-----------------------------------##3 druidlog4j.logger.druid.sql=INFOlog4j.logger.druid.sql.DataSource=infolog4j.logger.druid.sql.Connection=infolog4j.logger.druid.sql.Statement=infolog4j.logger.druid.sql.ResultSet=info#4 mybatis 显示SQL语句部分log4j.logger.org.mybatis=DEBUG#log4j.logger.cn.tibet.cas.dao=DEBUG#log4j.logger.org.mybatis.common.jdbc.SimpleDataSource=DEBUG##log4j.logger.org.mybatis.common.jdbc.ScriptRunner=DEBUG##log4j.logger.org.mybatis.sqlmap.engine.impl.SqlMapClientDelegate=DEBUG##log4j.logger.java.sql.Connection=DEBUGlog4j.logger.java.sql=DEBUGlog4j.logger.java.sql.Statement=DEBUGlog4j.logger.java.sql.ResultSet=DEBUGlog4j.logger.java.sql.PreparedStatement=DEBUG |
配置mapper.xml
mapper.xml在mybatis.xml是专职处理sql的一个环节，各种映射和实现都在这里处理
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<?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.autohome.mapper.User"> <!-- 查询全部用户 --> <select id="queryUsers" resultType="com.autohome.model.User"> select * from t_userinfo </select> <!-- 按照ID查询 --> <select id="queryUserById" parameterType="int" resultType="com.autohome.model.User"> select * from t_userinfo where id=#{id} </select> <select id="queryUserByAddress" resultType="com.autohome.model.User"> select * from t_userinfo where name=#{name,javaType=String,jdbcType=VARCHAR} and address=#{address} </select> <!-- 添加用户 --> <insert id="insertUsers" parameterType="com.autohome.model.User"> insert into t_userinfo (name,address) values(#{name},#{address}) </insert> <!-- 修改用户 --> <update id="updateUsers" parameterType="com.autohome.model.User"> update t_userinfo set name=#{name},address=#{address} where id=#{id} </update> <!-- 删除用户 --> <delete id="deleteUsers" parameterType="int"> delete t_userinfo where id=#{id} </delete></mapper> |
建立单元测试
1、准备工作，我建立的是控制台程序，所以在使用sqlsession前先创建sqlsessionfactory。当然，还要加载log4j.properties
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SqlSessionFactory sqlSessionFactory=null; @Before public void BeforeClass(){ try { InputStream is=Resources.getResourceAsStream("log4j.properties"); PropertyConfigurator.configure(is); Reader reader = Resources.getResourceAsReader("mybatis.xml"); sqlSessionFactory= new SqlSessionFactoryBuilder().build(reader); } catch (IOException e) { e.printStackTrace(); } } |
2、queryUsers
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@Test public void queryUsers() throws Exception { //线程不安全类型，放在方法体内 SqlSession sqlSession=null; try { sqlSession=sqlSessionFactory.openSession(); List<User> list = sqlSession.selectList("com.autohome.mapper.User.queryUsers"); System.out.println("size:"+list.size()); } catch (Exception e) { e.printStackTrace(); }finally { sqlSession.close(); } } |
3、queryUserById
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@Test public void queryUserById() { SqlSession sqlSession=null; try{ sqlSession=sqlSessionFactory.openSession(); User user = sqlSession.selectOne("com.autohome.mapper.User.queryUserById",2); System.out.println("id:"+user.getId()+",name:"+user.getName()+","+user.getAddress()); }catch(Exception e){ e.printStackTrace(); }finally { sqlSession.close(); } } |
4、insertUser
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@Test public void insertUser(){ SqlSession sqlSession=null; try{ sqlSession=sqlSessionFactory.openSession(); User user =new User(); user.setName("kobe"); user.setAddress("usa"); int result = sqlSession.insert("com.autohome.mapper.User.insertUsers",user); sqlSession.commit(); if(result>0){ System.out.println("insert success...."); }else{ System.out.println("insert error...."); } }catch(Exception e){ e.printStackTrace(); }finally { sqlSession.close(); } } |
5、updateUser
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@Test public void updateUser(){ SqlSession sqlSession=null; try{ sqlSession=sqlSessionFactory.openSession(); User user =new User(); user.setId(36); user.setName("kobe"); user.setAddress("usa"); int result = sqlSession.update("com.autohome.mapper.User.updateUsers",user); sqlSession.commit(); if(result>0){ System.out.println("update success...."); }else{ System.out.println("update error...."); } }catch(Exception e){ e.printStackTrace(); }finally { sqlSession.close(); } } |
6、deleteUser
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@Test public void deleteUser(){ SqlSession sqlSession=null; try{ sqlSession=sqlSessionFactory.openSession(); int result = sqlSession.delete("com.autohome.mapper.User.deleteUsers",49); sqlSession.commit(); if(result>0){ System.out.println("delete success...."); }else{ System.out.println("delete error...."); } }catch(Exception e){ e.printStackTrace(); }finally { sqlSession.close(); } } |
总结
添加、修改、删除的操作要调用sqlsession.commit(),不然数据无法入库的，我刚开始就忘记了这个。
以上所述是小编给大家介绍的MyBatis中SqlSession实现增删改查案例，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！
原文链接：http://www.cnblogs.com/sword-successful/p/6504222.html
