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DF_DRIVER_DEFAULT_NULLABLE_TEXT

The default setting for the "nullability" of newly created text columns.

Level

Driver

Supported by

The DataFlex SQL Drivers (SQL Server, DB2, and ODBC), revision 5 and higher.

Type

Boolean, temporary.

Access

Read/Write.

Values

  • True
  • False

Syntax

Use cli.pkg
Get_Attribute DF_DRIVER_DEFAULT_NULLABLE_TEXT of {driverNumber} to {BooleanVariable}
Set_Attribute DF_DRIVER_DEFAULT_NULLABLE_TEXT of {driverNumber} to {True|False}

Driver Configuration Keyword

Default_Default_Nullable_Text

Remarks

Columns can be allowed to contain null values, so-called "nullable" columns. This attribute sets up the default "nullability" of text columns. In general, we recommend not allowing null values in columns (of any type). See the section Null values and defaults for more information.

This default value is copied to the database level when logging in to the database. The actual value in use for an active connection is that on the database level. This attribute merely reflects a default.

Sample Code

The sample code below shows the current setting for a given driver.

Function DriverIndex String sDriver Returns Integer
    String sCurrentDriver
    Integer iNumberOfDrivers iDriver iCount
    Move 0 to iDriver
    Get_Attribute DF_NUMBER_DRIVERS to iNumberOfDrivers
    For iCount From 1 To iNumberOfDrivers
        Get_Attribute DF_DRIVER_NAME of iCount To sCurrentDriver
        If (Uppercase(sCurrentDriver) = Uppercase(sDriver)) Begin
            Move iCount to iDriver
        End
    Loop
    Function_Return iDriver
End_Function // DriverIndex

Procedure ShowDriverAttribute
    Boolean bAttribValue
    Integer iDriver
    Get DriverIndex "MSSQLDRV" to iDriver
    Get_Attribute DF_DRIVER_DEFAULT_NULLABLE_TEXT of iDriver to bAttribValue
    Showln "Default nullable text: " (If(bAttribValue, "YES", "NO"))
End_Procedure