集成Mybatis通用Mapper以及代码生成器-蒲公英云

为什么要学习Mybatis的通用Mapper，相信也不用我做太多介绍，总之他能简化我们开发过程中对数据库的单表操作。
这里详细讲解一下Spring环境下配置Mybatis通用Mapper以及代码生成器的过程

pom.xml中引入依赖

<!--tk.mybatis/mapper -->
            <dependency>
                <groupId>tk.mybatis</groupId>
                <artifactId>mapper</artifactId>
                <version>3.3.8</version>
            </dependency>
            <!--mybatis-generator-core -->
            <dependency>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-core</artifactId>
                <version>1.3.3</version>
            </dependency>

pom.xml中配置代码生成器插件

<properties>
        <!-- MyBatis Generator -->
        <!-- Java接口和实体类 -->
        <targetJavaProject>${basedir}/src/main/java</targetJavaProject>
        <!-- mapper接口的生成位置 -->
        <targetMapperPackage>fei.mapper</targetMapperPackage>
        <!-- 实体类的生成位置 -->
        <targetModelPackage>fei.entity</targetModelPackage>
        <!-- MyBatis Generator mapper.xml生成位置 -->
        <targetResourcesProject>${basedir}/src/main/resources</targetResourcesProject>
        <targetXMLPackage>fei.mapper</targetXMLPackage>
    </properties>
        ......
    <!--通用mapper自动生成插件-->
        <plugin>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-maven-plugin</artifactId>
            <version>1.3.2</version>
            <configuration>
                <!--代码生成器配置文件路径-->
                <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
                <!--是否覆盖已经存在的文件-->
                <overwrite>true</overwrite>
                <verbose>true</verbose>
            </configuration>
            <dependencies>
                <dependency>
                    <groupId>mysql</groupId>
                    <artifactId>mysql-connector-java</artifactId>
                    <version>5.1.21</version>
                </dependency>
                <dependency>
                    <groupId>tk.mybatis</groupId>
                    <artifactId>mapper</artifactId>
                    <version>3.3.8</version>
                </dependency>
            </dependencies>
        </plugin>

编写代码生成器配置文件generatorConfig.xml

<?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>
     <!--加载配置文件取值-->
    <properties resource="classpath:generator.properties"/>
    <context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>
        <plugin type="${mapper.plugin}">
            <!--自定义通用Mapper接口，将来所有生成的mapper接口都会继承这个接口-->
            <property name="mappers" value="${mapper.Mapper}"/>
            <!--强制生成注解，不管entity与表名是否一致-->
            <property name="forceAnnotation" value="true"/>
            <!--区分大小写-->
            <property name="caseSensitive" value="true"/>
        </plugin>
         <!--连接数据库-->
        <jdbcConnection driverClass="${jdbc.driver}" connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}">
        </jdbcConnection>
        <!--pom.xml配置的文件生成路径-->
        <javaModelGenerator targetPackage="${targetModelPackage}" targetProject="${targetJavaProject}"/>
        <sqlMapGenerator targetPackage="${targetXMLPackage}" targetProject="${targetResourcesProject}"/>
        <javaClientGenerator targetPackage="${targetMapperPackage}" targetProject="${targetJavaProject}" type="XMLMAPPER" />
        <!--可以指定数据库中的某个表，%表示所有表-->
        <table tableName="%" >
            <generatedKey column="user_id" sqlStatement="Mysql" identity="true"/>
        </table>
    </context>
</generatorConfiguration>

resources根目录下定义需要加载的配置文件generator.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc//localhost:3306/mybatis?characterEncoding=utf-8
jdbc.username=root
jdbc.password=1111
mapper.plugin = tk.mybatis.mapper.generator.MapperPlugin
mapper.Mapper =fei.dao.BaseMapper

注意我的fei.dao.BaseMapper继承了extends Mapper<T>, MySqlMapper<T>，前面配置了所有自动生成的mapper接口都继承这个接口

然后将原来mybatis-batis.xml文件中的

<!-- 配置Mapper接口扫描 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 配置Mapper扫描包 -->
        <property name="basePackage" value="fei.mapper" />
    </bean>

改成

<!-- 配置Mapper接口扫描 -->
    <bean class="tk.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 配置Mapper扫描包 -->
        <property name="basePackage" value="fei.mapper" />
    </bean>

最后测试启动
在这里插入图片描述
没有报错，应该就在指定位置可以看到自动生成的实体类，Mapper接口，Mapper.xml文件

如自动帮我们生成的实体类

@Table(name = "customer")
public class Customer { 
    @Id
    @Column(name = "cust_id")
    private Integer custId;
    @Column(name = "cust_name")
    private String custName;
    @Column(name = "cust_profession")
    private String custProfession;
    @Column(name = "cust_phone")
    private String custPhone;
    ......