# Result Set >![](../../public_sys-resources/icon-note.gif) **NOTE** > >The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version. ## System Capabilities SystemCapability.DistributedDataManager.RelationalStore.Core ## Usage The **resultSet** object is obtained by using [**RdbStore.query\(\)**](js-apis-data-rdb.md#query). ``` import dataRdb from '@ohos.data.rdb'; let predicates = new dataRdb.RdbPredicates("EMPLOYEE") predicates.equalTo("AGE", 18) let promise = rdbStore.query(predicates, ["ID", "NAME", "AGE", "SALARY", "CODES"]) promise.then((resultSet) => { console.log("resultSet columnNames:" + resultSet.columnNames); console.log("resultSet columnCount:" + resultSet.columnCount); ``` ## ResultSet Provides methods to access the result set, which is obtained by querying the relational database \(RDB\) store. ### Attributes

Name	Type	Mandatory	Description
columnNames	Array<string>	Yes	Names of all columns in the result set.
columnCount	number	Yes	Number of columns in the result set.
rowCount	number	Yes	Number of rows in the result set.
rowIndex	number	Yes	Index of the current row in the result set.
isAtFirstRow	boolean	Yes	Specifies whether the cursor is in the first row of the result set.
isAtLastRow	boolean	Yes	Whether the cursor is in the last row of the result set.
isEnded	boolean	Yes	Whether the cursor is after the last row of the result set.
isStarted	boolean	Yes	Whether the cursor has been moved.
isClosed	boolean	Yes	Whether the result set is closed.

### getColumnIndex getColumnIndex\(columnName: string\): number Obtains the column index based on the specified column name. - Parameters

Name	Type	Mandatory	Description
columnName	string	Yes	Name of the column.

- Return values

Type	Description
number	Index of the column.

- Example ``` resultSet.goToFirstRow() const id = resultSet.getLong(resultSet.getColumnIndex("ID")) const name = resultSet.getString(resultSet.getColumnIndex("NAME")) const age = resultSet.getLong(resultSet.getColumnIndex("AGE")) const salary = resultSet.getDouble(resultSet.getColumnIndex("SALARY")) ``` ### getColumnName getColumnName\(columnIndex: number\): string Obtains the column name based on the specified column index. - Parameters

Name	Type	Mandatory	Description
columnIndex	number	Yes	Index of the column.

- Return values

Type	Description
string	Name of the column.

- Example ``` const id = resultSet.getColumnName(0) const name = resultSet.getColumnName(1) const age = resultSet.getColumnName(2) ``` ### goTo goTo\(offset:number\): boolean Moves the cursor to the row based on the specified offset. - Parameters

Name	Type	Mandatory	Description
offset	number	Yes	Offset relative to the current position.

- Return values

Type	Description
boolean	Returns true if the operation is successful; returns false otherwise.

- Example ``` let predicates = new dataRdb.RdbPredicates("EMPLOYEE") rdbStore.query(predicates, ["ID", "NAME", "AGE", "SALARY", "CODES"]).then((resultSet) => { resultSet.goTo(1); resultSet.close(); resultSet = null; }) ``` ### goToRow goToRow\(position: number\): boolean Moves the cursor to the specified row in the result set. - Parameters

Name	Type	Mandatory	Description
position	number	Yes	Position to which the cursor is to be moved.

- Return values

Type	Description
boolean	Returns true if the operation is successful; returns false otherwise.

- Example ``` let predicates = new dataRdb.RdbPredicates("EMPLOYEE") rdbStore.query(predicates, ["ID", "NAME", "AGE", "SALARY", "CODES"]).then((resultSet) => { resultSet.goToRow(1); resultSet.close(); resultSet = null }) ``` ### goToFirstRow goToFirstRow\(\): boolean Moves the cursor to the first row of the result set. - Return values

Type	Description
boolean	Returns true if the operation is successful; returns false otherwise.

- Example ``` let predicates = new dataRdb.RdbPredicates("EMPLOYEE") rdbStore.query(predicates, ["ID", "NAME", "AGE", "SALARY", "CODES"]).then((resultSet) => { resultSet.goToFirstRow(); resultSet.close(); resultSet = null; }) ``` ### goToLastRow goToLastRow\(\): boolean Moves the cursor to the last row of the result set. - Return values

Type	Description
boolean	Returns true if the operation is successful; returns false otherwise.

- Example ``` let predicates = new dataRdb.RdbPredicates("EMPLOYEE") rdbStore.query(predicates, ["ID", "NAME", "AGE", "SALARY", "CODES"]).then((resultSet) => { resultSet.goToLastRow(); resultSet.close(); resultSet = null; }) ``` ### goToNextRow goToNextRow\(\): boolean Moves the cursor to the next row in the result set. - Return values

Type	Description
boolean	Returns true if the operation is successful; returns false otherwise.

- Example ``` let predicates = new dataRdb.RdbPredicates("EMPLOYEE") rdbStore.query(predicates, ["ID", "NAME", "AGE", "SALARY", "CODES"]).then((resultSet) => { resultSet.goToNextRow() resultSet.close() resultSet = null; }) ``` ### goToPreviousRow goToPreviousRow\(\): boolean Moves the cursor to the previous row in the result set. - Return values

Type	Description
boolean	Returns true if the operation is successful; returns false otherwise.

- Example ``` let predicates = new dataRdb.RdbPredicates("EMPLOYEE") rdbStore.query(predicates, ["ID", "NAME", "AGE", "SALARY", "CODES"]).then((resultSet) => { resultSet.goToPreviousRow(); resultSet.close(); resultSet = null }) ``` ### getBlob getBlob\(columnIndex: number\): Uint8Array Obtains the value in the specified column in the current row as a byte array. - Parameters

Name	Type	Mandatory	Description
columnIndex	number	Yes	Index of the specified column, starting from 0.

- Return values

Type	Description
Uint8Array	Value in the specified column as a byte array.

- Example ``` const codes = resultSet.getBlob(resultSet.getColumnIndex("CODES")) ``` ### getString getString\(columnIndex: number\): string Obtains the value in the specified column in the current row as a string. - Parameters

Name	Type	Mandatory	Description
columnIndex	number	Yes	Index of the specified column, starting from 0.

- Return values

Type	Description
string	Value in the specified column as a string.

- Example ``` const name = resultSet.getString(resultSet.getColumnIndex("NAME")) ``` ### getLong getLong\(columnIndex: number\): number Obtains the value in the specified column in the current row as a **Long**. - Parameters

Name	Type	Mandatory	Description
columnIndex	number	Yes	Index of the specified column, starting from 0.

- Return values

Type	Description
number	Value in the specified column as a Long.

- Example ``` const age = resultSet.getLong(resultSet.getColumnIndex("AGE")) ``` ### getDouble getDouble\(columnIndex: number\): number Obtains the value in the specified column in the current row as a **double**. - Parameters

Name	Type	Mandatory	Description
columnIndex	number	Yes	Index of the specified column, starting from 0.

- Return values

Type	Description
number	Value in the specified column as a double.

- Example ``` const salary = resultSet.getDouble(resultSet.getColumnIndex("SALARY")) ``` ### isColumnNull isColumnNull\(columnIndex: number\): boolean Checks whether the value in the specified column in the current row is **null**. - Parameters

Name	Type	Mandatory	Description
columnIndex	number	Yes	Index of the specified column, starting from 0.

- Return values

Type	Description
boolean	Returns true if the value is null; returns false otherwise.

- Example ``` const isColumnNull = resultSet.isColumnNull(resultSet.getColumnIndex("CODES")) ``` ### close close\(\): void Closes the result set. - Example ``` let predicates = new dataRdb.RdbPredicates("EMPLOYEE") rdbStore.query(predicates, ["ID", "NAME", "AGE", "SALARY", "CODES"]).then((resultSet) => { resultSet.close(); resultSet = null }) ```