Tablestore:Query index description information

Prerequisites

A client is initialized. For more information, see Initialize a Tablestore client.

Parameters

Example

The following example shows how to use the show index in test_table statement to query index information for the test_table table.

func showIndex(client *tablestore.TableStoreClient) {
    // Create an SQL request.
    request := &tablestore.SQLQueryRequest{Query: "show index in test_table"}

    // Obtain the SQL response.
    response, err := client.SQLQuery(request)
    if err != nil {
        panic(err)
    }

    // Obtain the schema of the SQL return value.
    columns := response.ResultSet.Columns()
    fmt.Printf("response table schema:[")
    for l := 0; l < len(columns); l++ {
        fmt.Printf("%v:%v ", columns[l].Name, columns[l].Type.String())
    }

    // Traverse the SQL ResultSet to obtain the SQL return value.
    fmt.Println("]\nresponse resultset:")
    resultSet := response.ResultSet
    for resultSet.HasNext() {
        row := resultSet.Next()
        tableName, _ := row.GetStringByName("Table")
        fmt.Printf("%v, ", tableName)
        nonUnique, _ := row.GetInt64ByName("Non_unique")
        fmt.Printf("%v, ", nonUnique)
        keyName, _ := row.GetStringByName("Key_name")
        fmt.Printf("%v, ", keyName)
        seqInIndex, _ := row.GetInt64ByName("Seq_in_index")
        fmt.Printf("%v, ", seqInIndex)
        columnName, _ := row.GetStringByName("Column_name")
        fmt.Printf("%v, ", columnName)
        indexType, _ := row.GetStringByName("Index_type")
        fmt.Printf("%v\n", indexType)
    }
}

The following is a sample response:

response table schema: [Table:STRING Non_unique:INTEGER Key_name:STRING Seq_in_index:INTEGER Column_name:STRING Is_defined_column:STRING Search_type:STRING Collation:STRING Cardinality:INTEGER Sub_part:INTEGER Packed:STRING Null:STRING Index_type:STRING Comment:STRING Index_comment:STRING Visible:STRING Expression:STRING]
response resultset:
test_table, 0, PRIMARY, 1, pk,
test_table, 1, test_table_index, 1, pk, SearchIndex
test_table, 1, test_table_index, 2, bool_value, SearchIndex
test_table, 1, test_table_index, 3, double_value, SearchIndex
test_table, 1, test_table_index, 4, long_value, SearchIndex
test_table, 1, test_table_index, 5, string_value, SearchIndex

References

• To use a specific search index for an SQL query, create a mapping for the search index using the CREATE TABLE statement. For more information, see Create a mapping for a search index.

• Use SQL to query data based on specific fields. For more information, see Query data.