Tablestore:Prefix query

1. Go to the Index Management tab.

   1. Log on to the Table Store console.

   2. In the top navigation bar, select a resource group and a region.

   3. On the Overview page, click the instance name or click Instance Management in the Actions column.

   4. On the Instance Details tab, in the Data Table List tab, click the data table name or click Index Management in the Actions column.

2. On the Index Management tab, find the target Search Index and click Search in the Actions column.

3. In the Search dialog box, configure the query conditions.

   1. By default, all columns are returned. To return specific columns, turn off Retrieve All Columns and enter the column names, separated by commas.

      Note

      By default, Table Store returns the primary key columns of the data table.

   2. Select a logical operator: And, Or, or Not.

      If you select And, the query returns data that meets all specified conditions. If you select Or, the query returns data that meets at least one of the specified conditions. If you select Not, the query returns data that does not meet the specified conditions.

   3. Select an index field and click Add.

   4. Set the query type to Prefix query (PrefixQuery) and enter the prefix value.

   5. By default, sorting is disabled. To sort the results by a specific field, turn on Enable Sorting, add the sort field, and configure the sort order.

   6. By default, aggregation is disabled. To perform statistical aggregation on a specific field, turn on Enable Aggregation, add the field for aggregation, and configure the aggregation settings.

4. Click OK.

   The query results are displayed on the Index Management tab.

Run the search command to query data using a search index. For more information, see Search index.

1. Run the search command to query data by using the search_index search index and return all indexed columns.

   search -n search_index --return_all_indexed

2. Enter the query conditions when prompted. The following code is an example:

   {
       "Offset": -1,
       "Limit": 10,
       "Collapse": null,
       "Sort": null,
       "GetTotalCount": true,
       "Token": null,
       "Query": {
           "Name": "PrefixQuery",
           "Query": {
               "FieldName": "col_keyword",
               "Prefix": "hangzhou"
           }
       }
   }

You can perform a prefix query by using the Java SDK, Go SDK, Python SDK, Node.js SDK, .NET SDK, or PHP SDK. The following example uses the Java SDK.

The following example shows how to query for data where the value in the Col_Keyword column starts with the prefix "hangzhou".

/**
 * Query for data where the value in the Col_Keyword column starts with the prefix "hangzhou".
 * @param client
 */
private static void prefixQuery(SyncClient client) {
    SearchQuery searchQuery = new SearchQuery();
    PrefixQuery prefixQuery = new PrefixQuery(); // Set the query type to PrefixQuery.
    searchQuery.setGetTotalCount(true);
    prefixQuery.setFieldName("Col_Keyword");
    prefixQuery.setPrefix("hangzhou");
    searchQuery.setQuery(prefixQuery);
    //searchQuery.setGetTotalCount(true); // Set this parameter to return the total number of matched rows.

    SearchRequest searchRequest = new SearchRequest("<TABLE_NAME>", "<SEARCH_INDEX_NAME>", searchQuery);
    // Set the columnsToGet parameter to specify the columns to return or to return all columns. If this parameter is not set, only primary key columns are returned by default.
    //SearchRequest.ColumnsToGet columnsToGet = new SearchRequest.ColumnsToGet();
    //columnsToGet.setReturnAll(true); // Set this parameter to return all columns.
    //columnsToGet.setColumns(Arrays.asList("ColName1","ColName2")); // Set this parameter to return specified columns.
    //searchRequest.setColumnsToGet(columnsToGet);

    SearchResponse resp = client.search(searchRequest);
    //System.out.println("TotalCount: " + resp.getTotalCount()); // Print the total number of matched rows, not the number of returned rows.
    System.out.println("Row: " + resp.getRows());
}