分开分表 分布式事物

http://www.cnblogs.com/aoshicangqiong/p/7732922.html
在Java分布式项目中使用ShardingSphere实现自动分表,可按以下方式进行: #### 引入依赖 在Maven项目的`pom.xml`文件中添加ShardingSphere-JDBC的依赖: ```xml <dependency> <groupId>org.apache.shardingsphere</groupId> <artifactId>shardingsphere-jdbc-core</artifactId> <version>5.3.2</version> </dependency> ``` #### 配置数据源和分表规则 可以使用Java代码或者YAML文件来配置数据源和分表规则。以下是使用Java代码配置的示例: ```java import org.apache.shardingsphere.api.config.sharding.ShardingRuleConfiguration; import org.apache.shardingsphere.api.config.sharding.TableRuleConfiguration; import org.apache.shardingsphere.api.config.sharding.strategy.StandardShardingStrategyConfiguration; import org.apache.shardingsphere.shardingjdbc.api.ShardingDataSourceFactory; import javax.sql.DataSource; import java.sql.SQLException; import java.util.HashMap; import java.util.Map; import java.util.Properties; public class ShardingDataSourceConfig { public static DataSource getShardingDataSource() throws SQLException { // 配置真实数据源 Map<String, DataSource> dataSourceMap = new HashMap<>(); // 这里需要根据实际情况配置数据源,例如使用HikariCP // dataSourceMap.put("ds0", createDataSource("ds0")); // 配置分表规则 ShardingRuleConfiguration shardingRuleConfig = new ShardingRuleConfiguration(); // 配置订单表分表规则 TableRuleConfiguration orderTableRuleConfig = new TableRuleConfiguration("t_order", "ds0.t_order_${0..9}"); orderTableRuleConfig.setTableShardingStrategyConfig(new StandardShardingStrategyConfiguration("order_id", new PreciseTablesShardingAlgorithm())); shardingRuleConfig.getTableRuleConfigs().add(orderTableRuleConfig); // 创建ShardingDataSource return ShardingDataSourceFactory.createDataSource(dataSourceMap, shardingRuleConfig, new Properties()); } } ``` 其中`PreciseTablesShardingAlgorithm`是自定义的精确分表算法,示例代码如下: ```java import org.apache.shardingsphere.api.sharding.standard.PreciseShardingAlgorithm; import org.apache.shardingsphere.api.sharding.standard.PreciseShardingValue; import java.util.Collection; public class PreciseTablesShardingAlgorithm implements PreciseShardingAlgorithm<Long> { @Override public String doSharding(Collection<String> availableTargetNames, PreciseShardingValue<Long> preciseShardingValue) { Long value = preciseShardingValue.getValue(); // 后缀 String postfix = String.valueOf(value % 10); for (String availableTargetName : availableTargetNames) { if (availableTargetName.endsWith(postfix)) { return availableTargetName; } } throw new UnsupportedOperationException(); } } ``` #### 使用ShardingDataSource进行数据库操作 在项目中使用配置好的`ShardingDataSource`进行数据库操作,示例代码如下: ```java import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import javax.sql.DataSource; public class ShardingTableExample { public static void main(String[] args) throws SQLException { DataSource dataSource = ShardingDataSourceConfig.getShardingDataSource(); try (Connection connection = dataSource.getConnection(); PreparedStatement preparedStatement = connection.prepareStatement("SELECT * FROM t_order WHERE order_id = ?")) { preparedStatement.setLong(1, 123L); try (ResultSet resultSet = preparedStatement.executeQuery()) { while (resultSet.next()) { // 处理查询结果 } } } } } ```
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