SQLCONNECT( ) Function

Establishes a connection to a data source.

SQLCONNECT([nStatementHandle])

-or-

SQLCONNECT([cConnectionName | cDataSourceName [, cUserID [, cPassword ]][, lShared]])

Parameters

• nStatementHandle
  Specifies that a new statement handle be created for the underlying shared connection that is represented by nStatementHandle. The new statement handle uses the settings provided from nStatementHandle instead of using the default settings.

  Note   You cannot create a new statement handle for a connection that is not shared. Visual FoxPro generates an error if you attempt to create a new statement handle against a nonshared connection.

  You can also use SQLCONNECT( ) to obtain a new statement handle on a shared connection that was opened using SQLSTRINGCONNECT( ).

• cConnectionName
  Specifies a named connection created by the CREATE CONNECTION command.

  When creating a new shared connection, the cConnectionName parameter refers to a named connection in the current database container (DBC).

  When creating a new statement handle based on an existing shared connection, the cConnectionName parameter refers to a previous connection opened in shared mode.

  If you use the cConnectionName parameter without the lShared parameter or with lShared parameter as False (.F.), you will always create a new connection that is not shared.

• cDataSourceName
  Specifies the name of a data source as defined in your Odbc.ini file.

  You can also choose a data source from the Select Connection or Data Source Dialog Box, which appears when you call SQLCONNECT( ) without any additional arguments or with only the lShared parameter.

• cUserID
  Specifies the user identifier used to log on to the data source.

• cPassword
  Specifies the password for gaining access to the data source.

• lShared
  Specifies whether or not to create a shared connection.

  lShared	Description
  False (.F.)	SQLCONNECT( ) does not create a shared connection. (Default)
  True (.T.)	SQLCONNECT( ) creates a shared connection.

Return Values

Numeric data type. SQLCONNECT( ) returns a positive nonzero numeric value as the statement handle if you successfully connect to the data source. SQLCONNECT( ) returns –2 if it cannot make the connection.

Tip You should store this statement handle in a memory variable and use the variable in subsequent function calls that require a connection handle.

Remarks

The SQLCONNECT( ) and SQLSTRINGCONNECT( ) functions return a numeric value as the statement handle rather than a connection handle. You cannot obtain a connection handle directly. You can still set and get connection properties using the SQLSETPROP( ) and SQLGETPROP( ) functions by passing the statement handle for that connection and the string, "Shared", as arguments. All other SQL functions use a statement handle instead of a connection handle.

If you issue a statement such as SQLCONNECT(cConnectionName, .T.), and a shared connection is already open with the same name, then the settings for that connection do not change to the settings stored for that connection in the database container (DBC). However, the new statement handle will use the statement settings from the DBC.

Note   You must disable the Open Database Connectivity (ODBC) login dialog box to support SQL pass through with Microsoft Transaction Server. To disable the ODBC login dialog box, use the statement SQLSETPROP(cConnectionHandle, 'DispLogin', 3), where cConnectionHandle is the connection handle returned by SQLCONNECT( ). You can also disable the ODBC login dialog box in the Connection Designer.

Example

Example 1

The following example assumes that an ODBC data source called MyFoxSQLNT exists and is available. SQLCONNECT( ) returns a numeric value, which is stored to a variable named gnConnHandle.

If you successfully connect to the data source, SQLCONNECT( ) returns a positive number, a dialog box appears, and SQLDISCONNECT( ) is called to disconnect from the data source.

If you cannot connect to the data source, SQLCONNECT( ) returns a negative number and displays a message.

STORE SQLCONNECT('MyFoxSQLNT', 'myUserID', 'myPassword') TO gnConnHandle
IF gnConnHandle <= 0
   = MESSAGEBOX('Cannot make connection', 16, 'SQL Connect Error')
ELSE
   = MESSAGEBOX('Connection made', 48, 'SQL Connect Message')
   = SQLDISCONNECT(gnConnHandle)
ENDIF

Example 2

Each of the following examples create new shared connections. The Choose Data Source Dialog Box appears, and SQLCONNECT( ) creates the resulting connection as shared.

SQLCONNECT(.T.)
SQLCONNECT( myConnectionName, .T. )
SQLCONNECT( myDataSourceName, myUserID, myPassword, .T. )

Example 3

Each of the following examples creates a new statement handle based on an existing shared connection.

SQLCONNECT( StatementHandleValue )
SQLCONNECT( myConnectionName, .T. )  

See Also

AERROR( ) | CREATE CONNECTION | SQLDISCONNECT( ) | SQLGETPROP( ) | SQLEXEC( ) | SQLSETPROP( ) | SQLSTRINGCONNECT( )