Range query - Tablestore - Alibaba Cloud Documentation Center

You can use range query to query data that falls within a specified range. If the type of a field is TEXT, Tablestore tokenizes the string and matches any of the tokens that fall within the specified range.

Prerequisites

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

Parameters


Parameter	Description
fieldName	The name of the field that you want to match.
from	The value from which the query starts. When you set range conditions, you can use greaterThan to indicate the greater than (>) sign and greaterThanOrEqual to indicate the greater-than-or-equal-to (≥) sign.
to	The value with which the query ends. When you set range conditions, you can use lessThan to indicate the less-than (<) sign and lessThanOrEqual to indicate the less-than-or-equal-to (≤) sign.
includeLower	Specifies whether to include the value of the from parameter in the response. Type: Boolean.
includeUpper	Specifies whether to include the value of the to parameter in the response. Type: Boolean.
query	The query type, which is set to RangeQuery.
sort	The sorting method. For more information, see Sorting and paging.
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.
tableName	The name of the table.
indexName	The name of the search index.
columnsToGet	Specifies whether to return all columns of each matched row. You can configure returnAll and columns for this parameter. By default, returnAll is set to false, which indicates that not all columns are returned. If returnAll is set to false, you can use columns to specify the columns to return. If you do not specify the columns to return, only the primary key columns are returned. If returnAll is set to true, all columns are returned.

Examples

/**
 * Search the table for rows where the value in Col_Long is greater than 3. Tablestore sorts these rows by Col_Long in descending order.
 * @param client
 */
private static void rangeQuery(SyncClient client) {
    SearchQuery searchQuery = new SearchQuery();
    RangeQuery rangeQuery = new RangeQuery(); // Set the query type to RangeQuery.
    rangeQuery.setFieldName("Col_Long");  // Set the name of the field that you want to match.
    rangeQuery.greaterThan(ColumnValue.fromLong(3));  // Specify the range of the values of the field. The matched values are greater than 3.
    searchQuery.setGetTotalCount(true);
    searchQuery.setQuery(rangeQuery);
    // Sort the query results by Col_Long in descending order.
    FieldSort fieldSort = new FieldSort("Col_Long");
    fieldSort.setOrder(SortOrder.DESC);
    searchQuery.setSort(new Sort(Arrays.asList((Sort.Sorter)fieldSort)));
    //searchQuery.setGetTotalCount(true); // Specify that the total number of matched rows is returned.

    SearchRequest searchRequest = new SearchRequest("sampleTable", "sampleSearchIndex", searchQuery);
    // You can set the columnsToGet parameter to specify the columns to return or specify that all columns are returned. If you do not set this parameter, only the primary key columns are returned.
    //SearchRequest.ColumnsToGet columnsToGet = new SearchRequest.ColumnsToGet();
    //columnsToGet.setReturnAll(true); // Set ReturnAll to true to return all columns.
    //columnsToGet.setColumns(Arrays.asList("ColName1","ColName2")); // Set Columns to return specified columns.
    //searchRequest.setColumnsToGet(columnsToGet);

    SearchResponse resp = client.search(searchRequest);
    //System.out.println("TotalCount: " + resp.getTotalCount()); // Display the total number of matched rows instead of the number of returned rows.
    System.out.println("Row: " + resp.getRows());
}