目录[-]
1.编写Generator执行配置文件:
generatorConfigation.xml。注意配置数据库驱动包的绝对路径。
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<? xml version = "1.0" encoding = "UTF-8" ?> <! DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"> < generatorConfiguration > <!-- 数据库驱动包,使用绝对路径 --> < classPathEntry location = "c:/mysql-connector-java-5.1.22-bin.jar" /> <!-- 环境配置 ************************************************** id="自定义的配置名称" targetRuntime="MyBatis版本" --> < context id = "MySqlTables" targetRuntime = "MyBatis3" > <!-- 数据库 =============================================== driverClass="驱动" connectionURL="数据库url" userId="用户" password="密码" --> < jdbcConnection driverClass = "com.mysql.jdbc.Driver" connectionURL = "jdbc:mysql://127.0.0.1:3306/db_mybatis" userId = "root" password = "root" > </ jdbcConnection > <!-- Java数据类型分离器,数据类型转换 ===================== property 属性 name="强迫双精度" value="不" --> < javaTypeResolver > < property name = "forceBigDecimals" value = "false" /> </ javaTypeResolver > <!-- Java模型生成器 ======================================= targetPackage="生成文件的目标路径" targetProject="已存在的项目包" enableSubPackages-可以省略对应约束名,true-是的,可以省略tb_generator trimString-验证字符串,true-是的 --> < javaModelGenerator targetPackage = "cn.cvu.test.model" targetProject = "src" > < property name = "enableSubPackages" value = "false" /> < property name = "trimStrings" value = "true" /> </ javaModelGenerator > <!-- sql映射文件生成器 ======================================= targetPackage="生成文件的目标路径" targetProject="已存在的项目包" enableSubPackages-可以省略对应约束名,true-是的,可以省略tb_generator --> < sqlMapGenerator targetPackage = "cn.cvu.test.xml" targetProject = "src" > < property name = "enableSubPackages" value = "false" /> </ sqlMapGenerator > <!-- java委托对象DAO生成器,接口 ============================= type="" targetPackage="生成文件的目标路径" targetProject="已存在的项目包" enableSubPackages-可以省略对应约束名,true-是的,可以省略tb_generator --> < javaClientGenerator type = "XMLMAPPER" targetPackage = "cn.cvu.test.dao" targetProject = "src" > < property name = "enableSubPackages" value = "false" /> </ javaClientGenerator > <!-- 表单,已存在,根据此表生成其它文件 ======================= tableName="已有的表单名称" domainObjetctName="对应生成的文件名前缀" --> < table tableName = "tb_generator" domainObjectName = "Eminem" > <!-- useActualColumnNames-使用真实列名 , true-嗯。如果false,则由columnOverride节点控制 --> < property name = "useActualColumnNames" value = "true" /> <!-- 标识列 column="列名" sqlStatement="某种数据库语言" identity="作为主键" --> < generatedKey column = "id" sqlStatement = "MySql" identity = "true" /> <!-- 覆盖项,当property name="useActualColumnNames" value="true"时。 column="被覆盖值的列名" property="用来覆盖的对应的java类的属性" --> < columnOverride column = "name" property = "generName" /> </ table > </ context > </ generatorConfiguration > |
2.在MyEclipse中建空web项目:
将配置文件放到src里。加入generator的jar文件。
3.编写并执行Java程序:
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package cn.cvu.test.build; import java.io.File; import java.util.ArrayList; import java.util.List; import org.junit.Test; import org.mybatis.generator.api.MyBatisGenerator; import org.mybatis.generator.config.Configuration; import org.mybatis.generator.config.xml.ConfigurationParser; import org.mybatis.generator.internal.DefaultShellCallback; public class TestGenerateWithJava { @Test public void testBuild() throws Exception { // 信息缓存 List<String> warnings = new ArrayList<String>(); // 覆盖已有的重名文件 boolean overwrite = true ; // 准备 配置文件 File configFile = new File( "F:/myeclipse_workspace/generator/src/generatorConfigation.xml" ); // 1.创建 配置解析器 ConfigurationParser parser = new ConfigurationParser(warnings); // 2.获取 配置信息 Configuration config = parser.parseConfiguration(configFile); // 3.创建 默认命令解释调回器 DefaultShellCallback callback = new DefaultShellCallback(overwrite); // 4.创建 mybatis的生成器 MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings); // 5.执行,关闭生成器 myBatisGenerator.generate( null ); } } |
4.查看并修改生成的文件:
选中src,按F5刷新,可以看到新文件已经创建:
修改报错的EmineMapper.java文件,去除注解:
5.测试,使用生成的文件查询:
1)导入MyBatis的jar包:
mybatis-3.2.2.jar
mybatis-generator-core-1.3.2.jar
mysql-connector-java-5.1.22-bin.jar
2)创建MyBatis的xml配置文件:
上面我们注释掉了自动生成的注解代码,在src新建一个xml配置文件,mybatisConfigation.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 > < environments default = "development" > < environment id = "development" > < transactionManager type = "JDBC" /> < dataSource type = "POOLED" > < property name = "driver" value = "com.mysql.jdbc.Driver" /> < property name = "url" value = "jdbc:mysql://127.0.0.1:3306/db_mybatis" /> < property name = "username" value = "root" /> < property name = "password" value = "root" /> </ dataSource > </ environment > </ environments > < mappers > <!-- 引入MBG生成器创建的映射文件 --> < mapper resource = "cn/cvu/test/xml/EminemMapper.xml" /> </ mappers > </ configuration > |
3)Java测试代码:
创建测试类cn.cvu.test.dotest.TestDoGeneratorWithJava :
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package cn.cvu.test.dotest; import java.io.Reader; import java.util.List; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import org.junit.Test; import cn.cvu.test.dao.EminemMapper; import cn.cvu.test.model.Eminem; import cn.cvu.test.model.EminemExample; import cn.cvu.test.model.EminemExample.Criteria; public class TestDoGeneratorWithJava { @Test public void testQuery() throws Exception { // 创建SQL会话: Reader reader = Resources.getResourceAsReader( "mybatisConfigation.xml" ); SqlSession session = new SqlSessionFactoryBuilder().build(reader).openSession(); // 创建查询实例: EminemExample eminemExample = new EminemExample(); // 获取映射实体: EminemMapper mapper = session.getMapper(EminemMapper. class ); // 利用实体通过实例查询全部条目 List<Eminem> eminems = mapper.selectByExample(eminemExample); System.out.println( "ID name notes
" ); for (Eminem eminem : eminems) { System.out.println(eminem.getId()+ " " +eminem.getGenerName()+ " " +eminem.getNotes()); } session.close(); } } |
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