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                ## 一、概述 一般用spring data jpa來實現。 ## 二、步驟 1、添加相 jar 包 ~~~ <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> ~~~ 2、application.properties中添加配置項 ~~~ spring.datasource.url=jdbc:mysql://localhost:3306/test spring.datasource.username=root spring.datasource.password=root spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.jpa.properties.hibernate.hbm2ddl.auto=update spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect spring.jpa.show-sql= true ~~~ 3、添加實體類和 Dao dao 只要繼承 JpaRepository 類就可以,幾乎可以不用寫方法; 實體類用@Entity標注,Entity 中不映射成列的字段得加 @Transient 注解,不加注解也會映射成列; ## 三、連接池 默認的,采用Hikaricp連接池,無須額外引入,即可; 直接增加連接池的相關配置就可以了; 例如: ![](../../images/screenshot_1605661055100.png)
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