Mybatis是目前主流的ORM框架,相比于hibernate的全自动,它是半自动化需要手写sql语句、接口、实体对象,后来推出的Generator自动生成代码,可以帮我们提高开发效率。
本文目的:SpringBoot 整合 Mybatis Generator自动生成dao、entity、mapper.xml实现单表增删改查。
1.创建SpringBoot项目
File→New→Project… 选择Spring Initializr,选择JDK版本,默认初始化URL
填写项目名称,java版本,其他描述信息
选择项目存放路径
选择web、mybatis、mysql依赖
Next–>Finish完成项目创建
2. mybatis-generator-maven插件的配置
打开项目的pom.xml文件添加
1 2 3 4 5 6 7 8 | < plugin > < groupId >org.mybatis.generator</ groupId > < artifactId >mybatis-generator-maven-plugin</ artifactId > < configuration > < verbose >true</ verbose > < overwrite >true</ overwrite > </ configuration > </ plugin > |
完整pom.xml
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | <? 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" < modelVersion >4.0.0</ modelVersion > < groupId >com.xyz</ groupId > < artifactId >mybatis</ artifactId > < version >0.0.1-SNAPSHOT</ version > < packaging >jar</ packaging > < name >mybatis</ name > < description >Spring Boot 整合 Mybatis</ description > < parent > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-parent</ artifactId > < version >2.0.5.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-thymeleaf</ 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 >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-test</ artifactId > < scope >test</ scope > </ dependency > < dependency > < groupId >com.github.pagehelper</ groupId > < artifactId >pagehelper-spring-boot-starter</ artifactId > < version >1.2.5</ version > </ dependency > </ dependencies > < build > < plugins > < plugin > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-maven-plugin</ artifactId > </ plugin > < plugin > < groupId >org.mybatis.generator</ groupId > < artifactId >mybatis-generator-maven-plugin</ artifactId > < configuration > < verbose >true</ verbose > < overwrite >true</ overwrite > </ configuration > </ plugin > </ plugins > </ build > </ project > |
3. 项目结构构建
在项目目录下(这里是mybatis)添加controller、service、dao、entity包,在resources下添加mapper包存放映射文件。
4. application.yml配置
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #端口号配置 server: port: 8088 spring: #模板引擎配置 thymeleaf: prefix: classpath:/templates/ suffix: .html mode: HTML encoding: UTF-8 cache: false servlet: content-type: text/html #静态文件配置 resources: static-locations: classpath:/static,classpath:/META-INF/resources,classpath:/templates/ #jdbc配置 datasource: username: xyz password: xyz driver-class-name: com.mysql.jdbc.Driver #mybatis配置 mybatis: #映射文件路径 mapper-locations: classpath:mapper/*.xml #模型所在的保命 type-aliases-package: com.xyz.mybatis.entity |
5. generatorConfig.xml配置
在resources文件下创建generatorConfig.xml文件,配置如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 | <? xml version = "1.0" encoding = "UTF-8" ?> <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" <!-- 配置生成器 --> < generatorConfiguration > <!--classPathEntry:数据库的JDBC驱动,换成你自己的驱动位置 可选 --> < classPathEntry location = "E:\IdeaProjects\mysql-connector-java-5.1.47.jar" /> <!-- 一个数据库一个context,defaultModelType="flat" 大数据字段,不分表 --> < context id = "MysqlTables" targetRuntime = "MyBatis3Simple" defaultModelType = "flat" > <!-- 自动识别数据库关键字,默认false,如果设置为true,根据SqlReservedWords中定义的关键字列表;一般保留默认值,遇到数据库关键字(Java关键字),使用columnOverride覆盖 --> < property name = "autoDelimitKeywords" value = "true" /> <!-- 生成的Java文件的编码 --> < property name = "javaFileEncoding" value = "utf-8" /> <!-- beginningDelimiter和endingDelimiter:指明数据库的用于标记数据库对象名的符号,比如ORACLE就是双引号,MYSQL默认是`反引号; --> < property name = "beginningDelimiter" value = "`" /> < property name = "endingDelimiter" value = "`" /> <!-- 格式化java代码 --> < property name = "javaFormatter" value = "org.mybatis.generator.api.dom.DefaultJavaFormatter" /> <!-- 格式化XML代码 --> < property name = "xmlFormatter" value = "org.mybatis.generator.api.dom.DefaultXmlFormatter" /> < plugin type = "org.mybatis.generator.plugins.SerializablePlugin" /> < plugin type = "org.mybatis.generator.plugins.ToStringPlugin" /> <!-- 注释 --> < commentGenerator > < property name = "suppressAllComments" value = "true" /> <!-- 是否取消注释 --> < property name = "suppressDate" value = "false" /> <!-- 是否生成注释代时间戳--> </ commentGenerator > <!-- jdbc连接--> < jdbcConnection driverClass = "com.mysql.jdbc.Driver" password = "xyz" /> <!-- 类型转换 --> < javaTypeResolver > <!-- 是否使用bigDecimal, false可自动转化以下类型(Long, Integer, Short, etc.) --> < property name = "forceBigDecimals" value = "false" /> </ javaTypeResolver > <!-- 生成实体类地址 --> < javaModelGenerator targetPackage = "com.xyz.mybatis.entity" targetProject = "src/main/java" > <!-- 是否让schema作为包的后缀 --> < property name = "enableSubPackages" value = "false" /> <!-- 从数据库返回的值去掉前后空格 --> < property name = "trimStrings" value = "true" /> </ javaModelGenerator > <!-- 生成map.xml文件存放地址 --> < sqlMapGenerator targetPackage = "mapper" targetProject = "src/main/resources" > < property name = "enableSubPackages" value = "false" /> </ sqlMapGenerator > <!-- 生成接口dao --> < javaClientGenerator targetPackage = "com.xyz.mybatis.dao" targetProject = "src/main/java" type = "XMLMAPPER" > < property name = "enableSubPackages" value = "false" /> </ javaClientGenerator > <!-- table可以有多个,每个数据库中的表都可以写一个table,tableName表示要匹配的数据库表,也可以在tableName属性中通过使用%通配符来匹配所有数据库表,只有匹配的表才会自动生成文件 enableSelectByPrimaryKey相应的配置表示是否生成相应的接口 --> < table tableName = "t_manager" enableCountByExample = "false" enableUpdateByExample = "false" enableDeleteByExample = "false" enableSelectByExample = "false" selectByExampleQueryId = "false" enableSelectByPrimaryKey = "true" enableUpdateByPrimaryKey = "true" enableDeleteByPrimaryKey = "true" > < property name = "useActualColumnNames" value = "true" /> </ table > </ context > </ generatorConfiguration > |
注意:
classPathEntry location=“E:\IdeaProjects\mysql-connector-java-5.1.47.jar”,建议用5.X系列的,否则可能生成的接口会缺少
6. 在idea中添加一个mybatis generator maven插件启动选项,点击Run,选择Edit Configuration… 点击加号"+"添加,选择maven,填写名称(这里用mybatis generator),命令行:mybatis-generator:generate -e
7. 选择 Mybatis Generator 启动,自动在dao、entity、mapper包下生成代码
注意:
利用Mybatis Generator自动生成代码,对于已经存在的文件会存在覆盖和在原有文件上追加的可能性,不宜多次生成。如需重新生成,需要删除已生成的源文件。
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