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Create Procedure prInsertEquipment_3 -- store values in equipment table. -- return identifier of the record to the caller. ( @chvMake varchar(50), @chvModel varchar(50), @chvEqType varchar(30), @intEquipmentId int ) As declare @intEqTypeId int, @ErrorCode int -- does such eqType already exists in the database If Not Exists (Select EqTypeId From EqType Where EqType = @chvEqType) --if it does not exist Begin -- insert new EqType in the database Insert EqType (EqType) Values (@chvEqType) -- get id of record that you've just inserted Select @intEqTypeId = @@identity, @ErrorCode = @@Error If @ErrorCode <> 0 begin Select 'Unable to insert Equipment Type. Error: ', @ErrorCode Return 1 End End Else Begin -- read Id of EqType

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Select @intEqTypeId From EqType Where EqType = @chvEqType Select @ErrorCode = @@Error If @ErrorCode <> 0 begin Select 'Unable to get Id of Equipment Type. Error: ', @ErrorCode Return 2 End End --insert equipment Insert Equipment (Make, Model, EqTypeId) Values (@chvMake, @chvModel, @intEqTypeId) Select @ErrorCode = @@Error If @ErrorCode <> 0 Begin Select 'Unable to insert Equipment. Error: ', @ErrorCode Return 3 End -- return id to the caller Select @intEquipmentId = @@identity Return 0

For each parent/child relationship created by a foreign key in a database, the SQL2 standard allows you to specify an associated delete rule and an associated update rule. The delete rule tells the DBMS what to do when a user tries to delete a row of the parent table. These four delete rules can be specified: The RESTRICT delete rule prevents you from deleting a row from the parent table if the row has any children. A DELETE statement that attempts to delete such a parent row is rejected with an error message. Deletions from the parent table are thus restricted to rows without any children. Applied to Figure 11-1, this rule can be summarized as "You can't delete an office if any salespeople are assigned to it." The CASCADE delete rule tells the DBMS that when a parent row is deleted, all of its child rows should also automatically be deleted from the child table. For Figure 11-1, this rule can be summarized as "Deleting an office automatically deletes all the salespeople assigned to that office." The SET NULL delete rule tells the DBMS that when a parent row is deleted, the foreign key values in all of its child rows should automatically be set to NULL. Deletions from the parent table thus cause a "set to NULL" update on selected columns of the child table. For the tables in Figure 11-1, this rule can be summarized as "If an office is deleted, indicate that the current office assignment of its salespeople is unknown."

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There is no limit to the number of levels. However, this capability should not be abused. The presence of too many levels is a sure sign that a more in-depth study should be made concerning code design.

Transact-SQL contains only one statement that allows looping:

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While Boolean_expression {sql_statement | statement_block} [Break]

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{sql_statement | statement_block} [Continue]

If the value of the Boolean expression is True (1), the server will execute one or more encapsulated Transact-SQL statement(s). From inside the block of statements, this execution can be controlled with the Break and Continue statements. The server will interrupt the looping when it encounters a Break statement. When the server encounters a Continue statement, it will ignore the rest of the statements and restart the loop.

The SET DEFAULT delete rule tells the DBMS that when a parent row is deleted, the foreign key values in all of its child rows should automatically be set to the default value for that particular column Deletions from the parent table thus cause a "set to DEFAULT" update on selected columns of the child table For the tables in Figure 11-1, this rule can be summarized as "If an office is deleted, indicate that the current office assignment of its salespeople is the default office specified in the definition of the SALESREPS table" There are some slight differences between the SQL2 and DB2 implementations of the delete rules The current DB2 implementation does not support the SET DEFAULT rule; it is only specified by the SQL2 standard The SQL2 standard actually calls the previously described RESTRICT rule, NO ACTION The SQL2 naming is somewhat confusing.