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https://github.com/wuwen5/ojdbc-mysql2oracle
SQL Syntax conversion from Mysql to Oracle (Nacos)
https://github.com/wuwen5/ojdbc-mysql2oracle
java mysql nacos oracle sql-conversion
Last synced: 21 days ago
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SQL Syntax conversion from Mysql to Oracle (Nacos)
- Host: GitHub
- URL: https://github.com/wuwen5/ojdbc-mysql2oracle
- Owner: wuwen5
- License: apache-2.0
- Created: 2021-05-28T10:25:41.000Z (over 3 years ago)
- Default Branch: master
- Last Pushed: 2024-07-12T10:02:52.000Z (4 months ago)
- Last Synced: 2024-10-14T19:37:29.127Z (about 1 month ago)
- Topics: java, mysql, nacos, oracle, sql-conversion
- Language: Java
- Homepage:
- Size: 69.3 KB
- Stars: 22
- Watchers: 3
- Forks: 4
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
## Mysql to Oracle
项目初期主要为适应Nacos在Oracle数据库上的部署而开发，采用驱动层代理来拦截SQL，并实时进行SQL语法转换， 可考虑在此基础上扩展支持其他数据库的语法转换。
## 功能
mysql到oracle语法转换, 支持部分mysql语法转换.
在 nacos-1.4.x、nacos-2.x、xxl-job 中已测试.
### nacos-2.2.x ~ 版本配置方式(nacos-2.2以上版本)
- 本项目本地打包后，将`ojdbc-mysql2oracle-x.y.x.jar`放入`nacos-server/plugins`目录
- 增加`conf/application.properties`以下配置 (db.url.0配置正确oracle jdbcUrl)
```
db.pool.config.driverClassName=com.cenboomh.commons.ojdbc.driver.MysqlToOracleDriver
spring.datasource.platform=mysql
```
### nacos-1.4.x ~ Nacos-2.1 版本配置方式(nacos-2.2以下版本)
因nacos-1.4.x无法直接配置驱动类，所以需通过javaagent方式加载
- 推荐将包放入nacos-server.jar同级目录
- Linux 修改start.sh
```bash
#将JAVA_OPT="${JAVA_OPT} -jar ${BASE_DIR}/target/${SERVER}.jar" 改为
JAVA_OPT="${JAVA_OPT} -javaagent:${BASE_DIR}/target/ojdbc-mysql2oracle-1.0.0-SNAPSHOT.jar -jar ${BASE_DIR}/target/${SERVER}.jar"
```
- Windows 修改start.bat
```cmd
rem 将 set "NACOS_OPTS=%NACOS_OPTS% -jar %BASE_DIR%\target\%SERVER%.jar" 改为
set "NACOS_OPTS=%NACOS_OPTS% -javaagent:%BASE_DIR%\target\ojdbc-mysql2oracle-1.0.0-SNAPSHOT.jar -jar %BASE_DIR%\target\%SERVER%.jar"
```
- 修改 nacos/conf/application.properties, 配置oracle连接信息
```properties
### Count of DB:
db.num=1
### Connect URL of DB:
db.url.0=jdbc:oracle:thin:@ip:port:orcl
db.user.0=nacos
db.password.0=nacos
```
## agent方式替换驱动的相关配置
对于不支持驱动类配置的项目可通过`agent`方式替换驱动
- 默认替换的mysql驱动为```com.mysql.cj.jdbc.Driver```
```
java -javaagent:path/to/ojdbc-mysql2oracle-x.y.x.jar
```
- 指定驱动类
```
java -javaagent:path/to/ojdbc-mysql2oracle-x.y.x.jar=driverClassName:com.mysql.jdbc.Driver
```
## 支持的语法
- ```select 1``` mysql中不带```from```的查询
- ```insert into ... returning primarykey``` 新增数据返回主键
例如: ```JdbcTemplate```中的```int update(PreparedStatementCreator psc, KeyHolder generatedKeyHolder)```
Mybatis中的 ``````
> oracle 11使用触发器+序列做自增长id
- ```delete from xxtable where ... limit ? ```
- ```limit``` 分页语句
- ```空值相等条件``` TODO:目前只支持在nacos中的 TENANT_ID = ?
- ```select 1 from dual as tableA``` from项别名使用as,oracle中去除as
- ```where !(...)``` -> ```where not(...)```
- ``` select 1 from `dual` ``` -> ``` select 1 from dual ``` 删除表名\列名中的反引号
- ```DATE_ADD(?, INTERVAL -? SECOND)```