Database.Execute Method (DAO)

Applies to: Access 2013 | Office 2013

Runs an action query or executes an SQL statement on the specified object.

Syntax

expression .Execute(Query, Options)

expression A variable that represents a Database object.

Parameters

Name

Required/Optional

Data Type

Description

Query

Required

String

Options

Optional

Variant

Remarks

You can use the following **RecordsetOptionEnum**constants for options.

Constant

Description

dbDenyWrite

Denies write permission to other users (Microsoft Access workspaces only).

dbInconsistent

(Default) Executes inconsistent updates (Microsoft Access workspaces only).

dbConsistent

Executes consistent updates (Microsoft Access workspaces only).

dbSQLPassThrough

Executes an SQL pass-through query. Setting this option passes the SQL statement to an ODBC database for processing (Microsoft Access workspaces only).

dbFailOnError

Rolls back updates if an error occurs (Microsoft Access workspaces only).

dbSeeChanges

Generates a run-time error if another user is changing data you are editing (Microsoft Access workspaces only).

dbRunAsync

Executes the query asynchronously (ODBCDirect Connection and QueryDef objects only).

dbExecDirect

Executes the statement without first calling SQLPrepare ODBC API function (ODBCDirect Connection and QueryDef objects only).

Note

ODBCDirect workspaces are not supported in Microsoft Access 2013. Use ADO if you want to access external data sources without using the Microsoft Access database engine.

Note

The constants dbConsistent and dbInconsistent are mutually exclusive. You can use one or the other, but not both in a given instance of OpenRecordset. Using both dbConsistent and dbInconsistent causes an error.

The Execute method is valid only for action queries. If you use Execute with another type of query, an error occurs. Because an action query doesn't return any records, Execute doesn't return a Recordset. (Executing an SQL pass-through query in an ODBCDirect workspace will not return an error if a Recordset isn't returned.)

Use the RecordsAffected property of the Connection, Database, or QueryDef object to determine the number of records affected by the most recent Execute method. For example, RecordsAffected contains the number of records deleted, updated, or inserted when executing an action query. When you use the Execute method to run a query, the RecordsAffected property of the QueryDef object is set to the number of records affected.

In a Microsoft Access workspace, if you provide a syntactically correct SQL statement and have the appropriate permissions, the Execute method won't fail — even if not a single row can be modified or deleted. Therefore, always use the dbFailOnError option when using the Execute method to run an update or delete query. This option generates a run-time error and rolls back all successful changes if any of the records affected are locked and can't be updated or deleted.

In earlier versions of the Microsoft Jet database engine, SQL statements were automatically embedded in implicit transactions. If part of a statement executed with dbFailOnError failed, the entire statement would be rolled back. To improve performance, these implicit transactions were removed starting with version 3.5. If you are updating older DAO code, be sure to consider using explicit transactions around Execute statements.

For best performance in a Microsoft Access workspace, especially in a multiuser environment, nest the Execute method inside a transaction. Use the BeginTrans method on the current Workspace object, then use the Execute method, and complete the transaction by using the CommitTrans method on the Workspace. This saves changes on disk and frees any locks placed while the query is running.

Example

This example demonstrates the Execute method when run from both a QueryDef object and a Database object. The ExecuteQueryDef and PrintOutput procedures are required for this procedure to run.

    Sub ExecuteX() 
     
     Dim dbsNorthwind As Database 
     Dim strSQLChange As String 
     Dim strSQLRestore As String 
     Dim qdfChange As QueryDef 
     Dim rstEmployees As Recordset 
     Dim errLoop As Error 
     
     ' Define two SQL statements for action queries. 
     strSQLChange = "UPDATE Employees SET Country = " & _ 
     "'United States' WHERE Country = 'USA'" 
     strSQLRestore = "UPDATE Employees SET Country = " & _ 
     "'USA' WHERE Country = 'United States'" 
     
     Set dbsNorthwind = OpenDatabase("Northwind.mdb") 
     ' Create temporary QueryDef object. 
     Set qdfChange = dbsNorthwind.CreateQueryDef("", _ 
     strSQLChange) 
     Set rstEmployees = dbsNorthwind.OpenRecordset( _ 
     "SELECT LastName, Country FROM Employees", _ 
     dbOpenForwardOnly) 
     
     ' Print report of original data. 
     Debug.Print _ 
     "Data in Employees table before executing the query" 
     PrintOutput rstEmployees 
     
     ' Run temporary QueryDef. 
     ExecuteQueryDef qdfChange, rstEmployees 
     
     ' Print report of new data. 
     Debug.Print _ 
     "Data in Employees table after executing the query" 
     PrintOutput rstEmployees 
     
     ' Run action query to restore data. Trap for errors, 
     ' checking the Errors collection if necessary. 
     On Error GoTo Err_Execute 
     dbsNorthwind.Execute strSQLRestore, dbFailOnError 
     On Error GoTo 0 
     
     ' Retrieve the current data by requerying the recordset. 
     rstEmployees.Requery 
     
     ' Print report of restored data. 
     Debug.Print "Data after executing the query " & _ 
     "to restore the original information" 
     PrintOutput rstEmployees 
     
     rstEmployees.Close 
     
     Exit Sub 
     
    Err_Execute: 
     
     ' Notify user of any errors that result from 
     ' executing the query. 
     If DBEngine.Errors.Count > 0 Then 
     For Each errLoop In DBEngine.Errors 
     MsgBox "Error number: " & errLoop.Number & vbCr & _ 
     errLoop.Description 
     Next errLoop 
     End If 
     
     Resume Next 
     
    End Sub 
     
    Sub ExecuteQueryDef(qdfTemp As QueryDef, _ 
     rstTemp As Recordset) 
     
     Dim errLoop As Error 
     
     ' Run the specified QueryDef object. Trap for errors, 
     ' checking the Errors collection if necessary. 
     On Error GoTo Err_Execute 
     qdfTemp.Execute dbFailOnError 
     On Error GoTo 0 
     
     ' Retrieve the current data by requerying the recordset. 
     rstTemp.Requery 
     
     Exit Sub 
     
    Err_Execute: 
     
     ' Notify user of any errors that result from 
     ' executing the query. 
     If DBEngine.Errors.Count > 0 Then 
     For Each errLoop In DBEngine.Errors 
     MsgBox "Error number: " & errLoop.Number & vbCr & _ 
     errLoop.Description 
     Next errLoop 
     End If 
     
     Resume Next 
     
    End Sub 
     
    Sub PrintOutput(rstTemp As Recordset) 
     
     ' Enumerate Recordset. 
     Do While Not rstTemp.EOF 
     Debug.Print " " & rstTemp!LastName & _ 
     ", " & rstTemp!Country 
     rstTemp.MoveNext 
     Loop 
     
    End Sub