You can use match all query to query the total number of rows in a table or obtain multiple rows of data.

Prerequisites

  • The OTSClient instance is initialized. For more information, see Initialization.
  • A data table is created and data is written to the table.
  • A search index is created for the table. For more information, see Create search indexes.

Parameters

Parameter Description
tableName The name of the table.
indexName The name of the search index.
offset The position from which the current query starts.
limit The maximum number of rows that the current query returns.

To query only the number of matched rows but not detailed data, you can set limit to 0. In this case, Tablestore returns the number of matched rows without data from the table.

query The query type. To use match all query, set this parameter to TableStore.QueryType.MATCH_ALL_QUERY.
getTotalCount Specifies whether to return the total number of rows that match the query conditions. By default, this parameter is set to false, which indicates that the total number of rows that match the query conditions is not returned.

Query performance is affected when this parameter is set to true.

columnToGet Specifies whether to return all columns of each matched row.
  • If you set returnType to TableStore.ColumnReturnType.RETURN_SPECIFIED, you can configure returnNames to specify the columns to return.
  • If you set returnType to TableStore.ColumnReturnType.RETURN_ALL, all columns are returned.
  • If you set returnType to TableStore.ColumnReturnType.RETURN_NONE, only the primary key columns are returned.

Examples

/**
 * Use match all query to query the total number of rows in a table.
 */
client.search({
    tableName: TABLE_NAME,
    indexName: INDEX_NAME,
    searchQuery: {
        offset: 0,
        limit: 10, // You can set limit to 0 if you do not need the specific data but the number of matched rows. A valve of 0 indicates that no data is returned.
        query: {
            queryType: TableStore.QueryType.MATCH_ALL_QUERY
        },
        getTotalCount: true // The value of TotalCount indicates the number of rows that match the query conditions. By default, TotalCount is set to false, which indicates that the total number of matched rows is not returned. Set TotalCount to true in this example.
    },
    columnToGet: { // You can set RETURN_SPECIFIED to return the specified columns, RETURN_ALL to return all columns, or RETURN_NONE to return no attribute columns from the table.
        returnType: TableStore.ColumnReturnType.RETURN_SPECIFIED,
        returnNames: ["Col_1", "Col_2", "Col_3"]
    }
}, function (err, data) {
    if (err) {
        console.log('error:', err);
        return;
    }
    console.log('success:', JSON.stringify(data, null, 2));
});