You can execute the show index statement to query the index information about tables.
Note For more information about the show index statement, see Query the index information about a table.
Prerequisites
- A Tablestore client is initialized. For more information, see Initialization.
- A mapping table is created. For more information, see Create tables and mapping tables.
Parameters
Parameter | Description |
---|---|
query | The SQL statement. Configure the parameter based on the required feature. |
Examples
Execute the show index in test_table
statement to query index information about the table named test_table.
func showIndex(client *tablestore.TableStoreClient) {
// Create a SQL request.
request := &tablestore.SQLQueryRequest{Query: "show index in test_table"}
// Obtain the response to the SQL request.
response, err := client.SQLQuery(request)
if err != nil {
panic(err)
}
// Obtain the schema of the returned results of the SQL request.
columns := response.ResultSet.Columns()
fmt.Printf("response table schema: %v\n", columns)
// Use SQL ResultSet to obtain all returned results of the SQL request.
fmt.Println("response 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)
}
}
Sample output:
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