oracle数据库转mysql数据库

1.删除oracle相关配置

1.1删除pom中的oracle依赖

1.2删除有关@Configuration中oracle配置

2.驱动引入

引入mysql依赖

         
            mysql
            mysql-connector-java
            8.0.13
        
        
            org.springframework.boot
            spring-boot-starter-jdbc
        

3.配置文件更改

spring:
  datasource:
    druid:
      url: jdbc:mysql://172.**.**.**:808*/******?characterEncoding=UTF-8&serverTimezone=UTC&useSSL=false
      username: ******
      password: ******
      driver-class-name: com.mysql.cj.jdbc.Driver
      initial-size: 1
      min-idle: 1
      max-active: 200
      max-wait: 6000
      pool-prepared-statements: true
      max-pool-prepared-statement-per-connection-size: 20
      time-between-eviction-runs-millis: 6000
      min-evictable-idle-time-millis: 300000
      validation-query: SELECT 1 FROM DUAL
      test-on-borrow: true
      test-while-idle: true
      test-on-return: false
      remove-abandoned: true
      remove-abandoned-timeout: 600
      log-abandoned: true
      filters: stat,log4j2
      filter:
        stat:
          enabled: true
          merge-sql: true
        log4j2:
          enabled: true
          connectionLogEnabled: false
          connectionLogErrorEnabled: true
          statementLogEnabled: true
          statementExecuteUpdateAfterLogEnable: true
          statementCreateAfterLogEnabled: false
          statementPrepareAfterLogEnabled: false
          statementPrepareCallAfterLogEnabled: false
          statementParameterClearLogEnable: false
          statementCloseAfterLogEnabled: false
          resultSetOpenAfterLogEnabled: false
          resultSetCloseAfterLogEnabled: false
      default-auto-commit: false

4.启动

下边两个需要注释掉，否则启动失败

5.分页配置

拿sql语句直接去数据库执行是成功的，但是放在程序里边就执行失败，打印sql看是分页的问题

想起来oracle分页和mysql不同

解决方法：application.yml中

原来
pagehelper:
  helper-dialect: oracle

改为
pagehelper:
  helper-dialect: mysql

6.sql语句修改

6.1  Oracle ifnull函数在MySQL中使用nvl替代

6.2 

oracle                                       -->                             mysql

to_char(sysdate,'yyyy-mm-dd')-->date_format(sysdate(),'%Y-%m-%d');
to_date(sysdate,'yyyy-mm-dd')-->STR_TO_DATE(sysdate(),'%Y-%m-%d');

7.中间还有一个插曲，与跟类路径有关

我发现页面带着根路径调用不到我得接口，但是我用postman不加跟类路径就能调用到我得接口

所以就在配置文件里把根路径给加上就可以正常访问了

server:
  servlet:
    context-path: /bdp-web