如果您只想使用 Java API 方式配置使用 ShardingSphere 影子库功能请参考以下配置。
类名称：org.apache.shardingsphere.shadow.config.ShadowRuleConfiguration
可配置属性：
| 名称 | 数据类型 | 说明 |
|---|---|---|
| dataSources | Map<String, ShadowDataSourceConfiguration> | 影子数据源映射名称和配置 |
| tables | Map<String, ShadowTableConfiguration> | 影子表名称和配置 |
| shadowAlgorithms | Map<String, AlgorithmConfiguration> | 影子算法名称和配置 |
| defaultShadowAlgorithmName | String | 默认影子算法名称 |
类名称：org.apache.shardingsphere.shadow.config.datasource.ShadowDataSourceConfiguration
可配置属性：
| 名称 | 数据类型 | 说明 |
|---|---|---|
| productionDataSourceName | String | 生产数据源名称 |
| shadowDataSourceName | String | 影子数据源名称 |
类名称：org.apache.shardingsphere.shadow.config.table.ShadowTableConfiguration
可配置属性：
| 名称 | 数据类型 | 说明 |
|---|---|---|
| dataSourceNames | Collection<String> | 影子表关联影子数据源映射名称列表 |
| shadowAlgorithmNames | Collection<String> | 影子表关联影子算法名称列表 |
类名称：org.apache.shardingsphere.infra.algorithm.core.config.AlgorithmConfiguration
可配置属性：
| 名称 | 数据类型 | 说明 |
|---|---|---|
| type | String | 影子算法类型 |
| props | Properties | 影子算法配置 |
算法类型的详情，请参见内置影子算法列表。
public final class ShadowConfiguration {
@Override
public DataSource getDataSource() throws SQLException {
Map<String, DataSource> dataSourceMap = createDataSourceMap();
return ShardingSphereDataSourceFactory.createDataSource(dataSourceMap, createRuleConfigurations(), createShardingSphereProps());
}
private Map<String, DataSource> createDataSourceMap() {
Map<String, DataSource> result = new LinkedHashMap<>();
result.put("ds", DataSourceUtil.createDataSource("demo_ds"));
result.put("ds_shadow", DataSourceUtil.createDataSource("shadow_demo_ds"));
return result;
}
private Collection<RuleConfiguration> createRuleConfigurations() {
Collection<RuleConfiguration> result = new LinkedList<>();
ShadowRuleConfiguration shadowRule = new ShadowRuleConfiguration();
shadowRule.setDataSources(createShadowDataSources());
shadowRule.setTables(createShadowTables());
shadowRule.setShadowAlgorithms(createShadowAlgorithmConfigurations());
result.add(shadowRule);
return result;
}
private Map<String, ShadowDataSourceConfiguration> createShadowDataSources() {
Map<String, ShadowDataSourceConfiguration> result = new LinkedHashMap<>();
result.put("shadow-data-source", new ShadowDataSourceConfiguration("ds", "ds_shadow"));
return result;
}
private Map<String, ShadowTableConfiguration> createShadowTables() {
Map<String, ShadowTableConfiguration> result = new LinkedHashMap<>();
result.put("t_user", new ShadowTableConfiguration(Collections.singletonList("shadow-data-source"), createShadowAlgorithmNames()));
return result;
}
private Collection<String> createShadowAlgorithmNames() {
Collection<String> result = new LinkedList<>();
result.add("user-id-insert-match-algorithm");
result.add("simple-hint-algorithm");
return result;
}
private Map<String, AlgorithmConfiguration> createShadowAlgorithmConfigurations() {
Map<String, AlgorithmConfiguration> result = new LinkedHashMap<>();
Properties userIdInsertProps = new Properties();
userIdInsertProps.setProperty("operation", "insert");
userIdInsertProps.setProperty("column", "user_type");
userIdInsertProps.setProperty("value", "1");
result.put("user-id-insert-match-algorithm", new AlgorithmConfiguration("VALUE_MATCH", userIdInsertProps));
return result;
}
}