springboot+mybatis+redis学习（一）

（PS:完整代码地址：https://github.com/WenMuJ/springboot

有兴趣的可以看看）

一.整合springboot+mybatis（idea版本）

1.创建springboot项目

选择spring initializr，点击next，输入工程名称等信息，下一步，选择相应的jar包

下一步之后，选择自己的工作空间地址。最后点击finish。至此，项目搭建第一步完成了。

下面附上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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.wsy</groupId>
    <artifactId>springboot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <mybatis.version>2.0.1</mybatis.version>
        <druid.version>1.1.10</druid.version>
        <mysql.version>8.0.16</mysql.version>
<!--        <spring-security.version>2.1.6.RELEASE</spring-security.version>-->
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>${mybatis.version}</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>${druid.version}</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <!-- 加上这个resources标签，将xml文件输出到target包下-->
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.2.4.RELEASE</version>
            </plugin>
            <!-- mybatis generator 自动生成代码插件 -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.4.0</version>
                <configuration>
                    <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
                    <overwrite>true</overwrite>
                    <verbose>true</verbose>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

二.配置mybatis

1.mybatis数据源（加入druid作为连接池）

在application.properties中配置

#配置数据源
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#加上?serverTimezone=UTC这个配置统一时区
#加上allowMultiQueries=true目的是为了让mysql开启批量更新
spring.datasource.url=jdbc:mysql://localhost:3306/springboot?serverTimezone=UTC&allowMultiQueries=true
spring.datasource.username=root
spring.datasource.password=
#配置连接池信息
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

2.配置mybatis generator 代码生成器

resources中创建generator文件夹，然后新建generator.xml文件

<?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>
    <classPathEntry
            location="D:\apache-maven-3.6.1\m2\mysql\mysql-connector-java\8.0.16\mysql-connector-java-8.0.16.jar"/>
    <context id="default" targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC"
                        userId="root"
                        password="123456">
            <property name="nullCatalogMeansCurrent" value="true"/>
        </jdbcConnection>
        <javaModelGenerator targetPackage="com.wsy.springboot.pojo"
                            targetProject="./src/main/java">
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <sqlMapGenerator targetPackage="mapper"
                         targetProject="./src/main/resources">
        </sqlMapGenerator>
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.wsy.springboot.mapper"
                             targetProject="./src/main/java">
        </javaClientGenerator>
        <table tableName="authority" domainObjectName="Authority"
               enableCountByExample="false" enableUpdateByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false"
               selectByExampleQueryId="false">
        </table>
    </context>
</generatorConfiguration>

完成后在右侧maven中找到对应的地方，双击mybatis-generate即可生成对应的pojo类和mapper文件。

三.一对多查询

mybatis完成一对多查询，也就是关联查询

1.pojo

user类中添加一个集合存放role

2.mapper.xml

使用collecation标签完成

--END

来源：CSDN

作者：三昷

链接：https://blog.csdn.net/anxian5227/article/details/104448415

标签

MyBatis