IDEA Springboot 整合Mybatis 完整教程系列 02

02  配置mybatis,利用自动生成插件，生产与数据库表对应的

      mapper接口，和xml文件

（1）设置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.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>


        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>



    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                </configuration>
            </plugin>




            <!-- mybatis generator 自动生成代码插件 -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.5</version>
                <configuration>
                    <!--generator配置文件的位置-->
                    <configurationFile>${basedir}/src/main/resources/mybatis-generator-config.xml</configurationFile>
                    <overwrite>true</overwrite>
                    <verbose>true</verbose>
                </configuration>
            </plugin>
        </plugins>

        <!-- 如果不添加此节点mybatis的mapper.xml文件都会被漏掉。 -->
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.yml</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.yml</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>


</project>

值得注意的是，下图指定的是mybatis-generator-config的配置文件路径

还有，如下，加入目录下的所有配置文件，防止遗漏

（2）mybatis-generator-config.xml

其中，生成entity类，和对应的路径如下

生成mapper接口，和对应的路径如下

生成mapper.xml，和对应的路径如下

完整的mybatis-generator-config.xml 如下：

<?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>
    <!--mysql 连接数据库jar 这里选择自己本地位置-->
    <classPathEntry location="E:\jar\mysql-connector-java-5.1.0-bin.jar" />
    <context id="testTables" targetRuntime="MyBatis3">


        <commentGenerator>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/easyloan" userId="root"
                        password="122026">
        </jdbcConnection>
        <!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 和
           NUMERIC 类型解析为java.math.BigDecimal -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- targetProject:生成entity类的位置 -->
        <javaModelGenerator targetPackage="com.example.demo.entity"
                            targetProject="src/main/java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
            <!-- 从数据库返回的值被清理前后的空格 -->
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- targetProject:mapper映射文件生成的位置
           如果maven工程只是单独的一个工程，targetProject="src/main/java"
           若果maven工程是分模块的工程，targetProject="所属模块的名称"，例如：
           targetProject="ecps-manager-mapper"，下同-->
        <sqlMapGenerator targetPackage="mapper"
                         targetProject="src/main/resources">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>
        <!-- targetPackage：mapper接口生成的位置 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.example.demo.mapper"
                             targetProject="src/main/java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
        </javaClientGenerator>


        <!-- 指定数据库表 -->

        <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名 schema 重复代码生成-->
        <table schema="" tableName="user" >
            <!--设置自增字段-->
            <generatedKey  column="user_id"  identity="false" sqlStatement="JDBC"/>
        </table>

        <table schema="" tableName="department" >
        </table>

        <table schema="" tableName="audit" >
            <!--设置自增字段-->
            <generatedKey  column="aud_id"  identity="false" sqlStatement="JDBC"/>
        </table>

        <table schema="" tableName="employee" >
            <!--设置自增字段-->
            <generatedKey  column="emp_id"  identity="false" sqlStatement="JDBC"/>
        </table>

        <table schema="" tableName="expected_repay" >
            <!--设置自增字段-->
            <generatedKey  column="exp_id"  identity="false" sqlStatement="JDBC"/>
        </table>

        <table schema="" tableName="linkman" >
        </table>

        <table schema="" tableName="loan_apply" >
            <!--设置自增字段-->
            <generatedKey  column="loan_id"  identity="false" sqlStatement="JDBC"/>
        </table>

        <table schema="" tableName="manager" >
            <!--设置自增字段-->
            <generatedKey  column="m_id"  identity="false" sqlStatement="JDBC"/>
        </table>

        <table schema="" tableName="manage" >
        </table>

        <table schema="" tableName="overdue_times" >
            <!--设置自增字段-->
            <generatedKey  column="overdue_id"  identity="false" sqlStatement="JDBC"/>
        </table>

        <table schema="" tableName="real_repay" >
            <!--设置自增字段-->
            <generatedKey  column="real_id"  identity="false" sqlStatement="JDBC"/>

        </table>

        //数据库对应的表
        <table schema="" tableName="user_login" >

        </table>

    </context>
</generatorConfiguration>

(3)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>

   <settings>
       <setting name="useGeneratedKeys" value="true"/>
       <setting name="useColumnLabel" value="true"/>
       <setting name="mapUnderscoreToCamelCase" value="true"/>
   </settings>
</configuration>

上述的文件以及对应的包目录建立好之后，就可以使用mybatis generator 插件自动生成代码了

在IDEA软件界面中，有如下，点击一下generator,即可自动生成代码。

如果找不到这个自带插件，请按如下链接操作，手动配置一个插件。

mybatis-generator自动生成