使用 Java API

使用 Java API

引入 Maven 依赖

<dependency>
    <groupId>org.apache.shardingsphere</groupId>
    <artifactId>shardingsphere-jdbc-governance</artifactId>
    <version>${shardingsphere.version}</version>
</dependency>
<!-- 使用 ZooKeeper 时，需要引入此模块 -->
<dependency>
    <groupId>org.apache.shardingsphere</groupId>
    <artifactId>shardingsphere-governance-repository-zookeeper-curator</artifactId>
    <version>${shardingsphere.version}</version>
</dependency>
<!-- 使用 Etcd 时，需要引入此模块 -->
<dependency>
    <groupId>org.apache.shardingsphere</groupId>
    <artifactId>shardingsphere-governance-repository-etcd</artifactId>
    <version>${shardingsphere.version}</version>
</dependency>

规则配置

以下示例将 ZooKeeper 作为配置中心和注册中心。

// 省略配置数据源以及规则
// ...
// 配置注册中心
RegistryCenterConfiguration registryCenterConfig = new RegistryCenterConfiguration("Zookeeper", "localhost:2181", new Properties());
// 配置治理
GovernanceConfiguration governanceConfiguration = new GovernanceConfiguration("governance-sharding-data-source", registryCenterConfig, true);
// 创建 GovernanceShardingSphereDataSource
DataSource dataSource = GovernanceShardingSphereDataSourceFactory.createDataSource(governanceConfiguration);

使用 GovernanceShardingSphereDataSource

通过 GovernanceShardingSphereDataSourceFactory 工厂创建的 GovernanceShardingSphereDataSource 实现自 JDBC 的标准接口 DataSource。可通过 DataSource 选择使用原生 JDBC，或JPA， MyBatis 等 ORM 框架。

以原生 JDBC 使用方式为例：

DataSource dataSource = GovernanceShardingSphereDataSourceFactory.createDataSource(governanceConfiguration);
String sql = "SELECT i.* FROM t_order o JOIN t_order_item i ON o.order_id=i.order_id WHERE o.user_id=? AND o.order_id=?";
try (
        Connection conn = dataSource.getConnection();
        PreparedStatement ps = conn.prepareStatement(sql)) {
    ps.setInt(1, 10);
    ps.setInt(2, 1000);
    try (ResultSet rs = preparedStatement.executeQuery()) {
        while(rs.next()) {
            // ...
        }
    }
}