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DB query to delete records in a database table

Create a database query to delete records from a database table.

Before you begin
To create a DB query action, you must to set up a database connection string. The following sample data values can be provided:

  • All numeric types = -1

  • Dates = 01/01/1900

  • Byte = 0

  • String = Blank String

  • Boolean = False

Procedure
  1. On the DB query action dialog box of a form, select Configure.
    The DBQuery dialog box is displayed.
  2. To specify the database connection string that holds the details of the relational database, select either Database connection.

    • Local (Default): Select a global variable or select to manually enter the connection string.

    • External: To use the database connection from external storage, enter the secret name for the connection secret stored in the configured external storage.

    A list of schema that the database user has permission to access is displayed.

  3. On the Schema list, select a database schema to use for retrieving database objects.

    The schema list displays all schemas that the database user has permission to access. If no schema is explicitly selected, the system uses the default schema for the database user (typically dbo for SQL Server).

  4. On the Tables list, select the table for which to delete the records.
  5. On the Record list, select Delete. (Default: Get)
  6. Configure your query based on some specific conditions. For example, to delete the records for the cities of London and Berlin, specify the Search criteria as follows:
    1. Select .
    2. On the Column list, select a column, such as City(String).
    3. Set the Operator as equals (default).
    4. For Criteria, select a form control, variable (form/global), or field.

      Select Null to keep the criteria empty.

    5. Set the Logic as AND.
    6. Select Add.
  7. For Return rows affected to, select a form control, variable (form/global), or field.
  8. Select OK.

    The DB query action dialog box displays the Query.

  9. Select Save.