将数据源的配置信息保存在数据库中,项目启动时候,Shardingjdbc从数据库中加载配置信息,并将其用于创建数据源,如何代码实现,代码示例
时间: 2023-10-06 08:11:39 浏览: 89
可以使用ShardingSphere提供的Spring Boot Starter来简化Shardingjdbc的配置过程。以下是一个基本示例:
1. 添加ShardingSphere Spring Boot Starter的依赖到项目的pom.xml文件中:
```xml
<dependency>
<groupId>org.apache.shardingsphere</groupId>
<artifactId>sharding-jdbc-spring-boot-starter</artifactId>
<version>${shardingsphere.version}</version>
</dependency>
```
2. 在application.yml文件中配置Shardingjdbc的数据源信息:
```yml
spring:
datasource:
# 默认数据源配置
url: jdbc:mysql://localhost:3306/sharding_db?serverTimezone=UTC&useSSL=false&allowPublicKeyRetrieval=true
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
type: com.alibaba.druid.pool.DruidDataSource
shardingsphere:
datasource:
names: ds0, ds1 # 配置数据源名称列表
ds0:
url: jdbc:mysql://localhost:3306/db0?serverTimezone=UTC&useSSL=false&allowPublicKeyRetrieval=true
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
type: com.alibaba.druid.pool.DruidDataSource
ds1:
url: jdbc:mysql://localhost:3306/db1?serverTimezone=UTC&useSSL=false&allowPublicKeyRetrieval=true
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
type: com.alibaba.druid.pool.DruidDataSource
sharding:
tables:
user:
actual-data-nodes: ds$->{0..1}.user_$->{0..1}
table-strategy:
inline:
sharding-column: id
algorithm-expression: user_$->{id % 2}
key-generator:
column: id
type: SNOWFLAKE
```
3. 在Spring Boot的启动类上添加`@EnableSharding`注解来启用Shardingjdbc:
```java
@SpringBootApplication
@EnableSharding
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
```
这样,在项目启动时Shardingjdbc就会从数据库中加载配置信息并创建数据源。
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