MyBatis Generate的使用及说明

        <!--mybatis Generator插件-->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-maven-plugin</artifactId>
            <version>1.4.0</version>
        </dependency>

<?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>
    <!--
        targetRuntime="MyBatis3Simple":生成简单版的CRUD
        MyBatis3:豪华版
        MyBatis3DynamicSql:默认值，小黄现在的水平，只能看懂大概是以注解形式来代替mapper配置文件
     -->
    <context id="DB2Tables" targetRuntime="MyBatis3">
        <!--设置数据库连接属性-->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC
                                        &characterEncoding=utf-8
                                        &useSSL=false
                                        &rewriteBatchedStatements=true
                                        &allowPublicKeyRetrieval=true"
                        userId="root"
                        password="Hkx123">
        </jdbcConnection>
        <!--设置类型解析器-->
        <javaTypeResolver >
            <!--举例：是否强制转换为bigdecimal，否-->
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>
        <!--
            javaModelGenerator:指定生成的JavaBean文件
            targetPackage:目标包名
            targetProject:目标工程
        -->
        <javaModelGenerator targetPackage="com.yellowstar.ssm.bean" targetProject="src\main\java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- sqlMapGenerator：sql映射生成策略： -->
        <sqlMapGenerator targetPackage="mybatis.mapper"  targetProject="src\main\resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>
        <!-- javaClientGenerator:指定mapper接口所在的位置 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.yellowstar.ssm.dao"  targetProject="src\main\java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>
        <!-- 指定要逆向分析哪些表：根据表要创建javaBean -->
        <table tableName="department" domainObjectName="Department"></table>
        <table tableName="employee" domainObjectName="Employee"></table>
    </context>
</generatorConfiguration>

    @Test
    public void testMbg() throws Exception {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("src/main/resources/mbg.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,
                callback, warnings);
        myBatisGenerator.generate(null);
    }

    public List<Employee> getAllEmps(){
        EmployeeExample employeeExample = new EmployeeExample();
        //criteria可以设置sql的过滤语句，用and连接
        Criteria criteria = employeeExample.createCriteria();
        criteria.andLastNameLike("%e%");
        criteria.andGenderEqualTo("1");
        //每个criteria1对象之间用or连接
        Criteria criteria1 = employeeExample.createCriteria();
        criteria1.andDIdEqualTo(2);
        employeeExample.or(criteria1);
        List<Employee> allEmps = empMapperImpl.selectByExample(employeeExample);
        return allEmps;
    }