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The developer can group several Transact-SQL statements by using Begin End statements in a logical unit. Such units are then typically used in flow-control statements to execute a group of Transact-SQL statements together. Flow-control statements like If, Case, and While can incorporate a single statement or a statement block to be executed when certain conditions are met.
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Begin Transact-SQL statements End
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There must be one or more Transact-SQL statements inside a block. If there is only one statement inside, you could remove the Begin and End keywords. Begin and End must be used as a pair. Alone, they are meaningless. If a compiler does not find a matching pair, it will report a syntax error. Begin and End can also be nested, but this practice is prone to errors. However, if you are cautious and orderly, there should not be a problem. An excellent way to avoid such problems is to indent the code:
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Begin Insert Order(OrderDate, RequestedById, TargetDate, DestinationLocation) Values(@OrderDate, @ContactId, @TargetDate, @LocId) Select @ErrorCode = @@Error, @OrderId = @@Identity if @ErrorCode <> 0 begin RaiseError('Error occurred while inserting Order!', 16,1) Return @@ErrorCode end End
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The If statement is the most common flow control statement. It is used to examine the value of a condition and to change the flow of code based on the condition. First, let us review its syntax.
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If boolean_expression {Transact-SQL_statement | statement_block} [else {Transact-SQL_statement | statement_block}]
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When the server encounters such a construct, it examines the value of the Boolean expression. If this value is True (1), it executes the statements or the statement block that follows it. The Else component of the statement is optional. It includes a single statement or a statement block that will be executed if the Boolean expression returns a value of False (0).
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NOTE: The most common mistake made by users of Visual Basic or other programming languages is to place a delimiter to finish the statement (i.e., endif ). Note also that the Boolean expression must not be followed by then (another VB artifact).
4:
Basic Transact-SQL Programming Constructs
The following code sample tests the value of the @ErrorCode variable. If the variable does not contain a zero, the server inserts a record in the Order table and then records the value of the identity key and any error that may have occurred in the process.
If @ErrorCode <> 0 Begin Insert Order(OrderDate, Values(@dtOrderDate, RequestedById, TargetDate, DestinationLocation) @intContactId, @dtTargetDate, @intLocId) Select End @intErrorCode = @@Error, @intOrderId = @@Identity
Let us take a look at a more complex case. The following stored procedure will insert a record in the equipment table and return the ID of the record to the caller. Unfortunately, the user supplies the equipment type in text form. The stored procedure must then find out if such an equipment type exists in the database and insert it if it does not.
Create Procedure prInsertEquipment_1 -- store values in equipment table. -- return identifier of the record to the caller. ( @chvMake varchar(50), @chvModel varchar(50), @chvEqType varchar(30) ) As declare @intEqTypeId int, @intEquipmentId int -- read Id of EqType Select @intEqTypeId From EqType Where EqType = @chvEqType
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-- does such eqType already exists in the database If @intEqTypeId IS NOT NULL --insert equipment Insert Equipment (Make, Model, EqTypeId) Values (@chvMake, @chvModel, @intEqTypeId) Else --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 --insert equipment Insert Equipment (Make, Model, EqTypeId) Values (@chvMake, @chvModel, @intEqTypeId) End Select @intEquipmentId = @@identity -- return id to the caller return @intEquipmentId
There are a few items that could be changed in this stored procedure, but the importance of this example is to illustrate a use of the Else statement. One item that could be improved upon is the process of investigating the EqType table with the Exists keyword. Its use here is similar to its use in the Where clause:
If [NOT] Exists(subquery) {Transact-SQL_statement | statement_block} [else {Transact-SQL_statement | statement_block}]
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