使用 API 创建全局活动表

可以使用 NoSQL Java SDK 在 NDCS 中创建全局活动表

可以使用 Java API 类 (AddReplicaRequest ) 执行 DDL 语句来创建全局活动表。

要创建全局活动表，请执行以下操作：
  • 创建包含至少一个 JSON 列的 NoSQL 表。
  • 冻结表的方案。通过在 DDL CREATE TABLE 语句中添加方案已冻结，可以在创建表时冻结表。
  • 只有在添加区域副本表之后，NoSQL 数据库表才会成为全局活动表。区域副本表是在另一个区域中创建的。
/* Initialize NoSQLHandle */
NoSQLHandleConfig config = new NoSQLHandleConfig(endpoint)
                          .setAuthorizationProvider(new SignatureProvider())
                          .setDefaultCompartment(compartmentId);
NoSQLHandle handle = NoSQLHandleFactory.createNoSQLHandle(config);
/* Create table */
String ddl = "CREATE TABLE IF NOT EXISTS " + tableName + "(" +
             "id INTEGER, name STRING, info JSON, PRIMARY KEY(id)) " +
             "with schema frozen";
String tableName = "<name_your_table";
String region = "<name_your_sender_region>";
System.output.println("Creating table: " + ddl);
TableRequest tableReq = new TableRequest()
                        .setStatement(ddl)
                        .setTableLimits(new TableLimits(50, 50, 1));
TableResult res = handle.tableRequest(tableReq);
res.waitForCompletion(handle, 90000, 1000);
System.output.println("Table created: " + tableName);
/* add replica ca-montreal-1 */
System.output.println("\nAdding replica: " + region);
AddReplicaRequest addRepReq = new AddReplicaRequest()
                              .setTableName(tableName)
                              .setReplicaName(region);
res = handle.addReplica(addRepReq);
res.waitForCompletion(handle, 90000, 1000);
System.output.println("Added replica: " + region);

创建子表：

使用 TableRequest 类创建子表。此外，要使子表成为全局活动表，需要冻结子表的方案并添加区域副本。您可以从父表的某个区域副本中进行选取。
/* Initialize NoSQLHandle */
NoSQLHandleConfig config = new NoSQLHandleConfig(endpoint)
                          .setAuthorizationProvider(new SignatureProvider())
                          .setDefaultCompartment(compartmentId);
NoSQLHandle handle = NoSQLHandleFactory.createNoSQLHandle(config);

/* Create table */
String ddl = "CREATE TABLE IF NOT EXISTS " + fulltableName + "(" +
             "cid INTEGER, cname STRING, cinfo JSON, PRIMARY KEY(id)) " +
             "with schema frozen";
System.output.println("Creating child table: " + ddl);
TableRequest tableReq = new TableRequest()
                        .setStatement(ddl));
TableResult res = handle.tableRequest(tableReq);
res.waitForCompletion(handle, 90000, 1000);
System.output.println("Child Table created: " + tableName);

/* add replica ca-montreal-1 */
System.output.println("\nAdding replica: " + region);
AddReplicaRequest addRepReq = new AddReplicaRequest()
                              .setTableName(fulltableName)
                              .setReplicaName(region);
res = handle.addReplica(addRepReq);
res.waitForCompletion(handle, 90000, 1000);
System.output.println("Added replica: " + region);

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