Stored Procedures and Triggers in Visual Studio .NET

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Stored Procedures and Triggers
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The Privileges tab allows you to define what Group Roles are allowed to execute the function By default, only the function owner is allowed to use it If you want everyone to be able to use the function, you must grant execute privileges for the public Group Role
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PL/pgSQL Function Code
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The PL/pgSQL procedural language allows you to create complex functions using simple SQL commands and standard programming statements It helps to know the syntax for the PL/pgSQL programming environment to develop complex functions This section describes the commands that are used within a PL/pgSQL function definition
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Assigning Values to Variables
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Since most functions are used to manipulate data, being able to assign values to variables is a crucial feature The PL/pgSQL assignment operator is used to assign values and expressions to variables:
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variable := expression;
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The expression can be any normal mathematical expression that uses constant values as well as other variables The result of the expression is assigned to variable Since functions often work with table data, PL/pgSQL provides a method for assigning table column data values to variables The SELECT INTO statement is used to perform a typical SELECT command against a table, assigning the output to a variable The format of the SELECT INTO statement is
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SELECT INTO variable [, ] column [, ] clause;
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One or more variables can be used to receive column data from the SELECT INTO statement Each variable is matched against a column from the column list The variables used in the SELECT INTO statement must have the same data types as the columns listed The clause parameter defines a normal SELECT clause used to filter data into a result set You can create a single variable that holds all of the data columns of a table The variable must be declared using the table s %ROWTYPE table attribute:
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customervar store"Customer"%ROWTYPE SELECT INTO customervar * FROM store"Customer" where "CustomerID" = 'BLU001';
This statement assigns the contents of the result set record to the customervar variable Each individual column data value can then be retrieved as an individual element of the variable:
result := customervar"FirstName" || ' ' || customervar"LastName";
Of course, this method assumes that only one record of data will be returned in the result set Later, this chapter discusses the FOR loop, showing how to deal with multiple records returned in the result set
PostgreSQL 8 for Windows
Condition Statements
Just like any other language, PL/pgSQL supports the use of IF/THEN/ELSE statements to allow program code branching based on conditions:
IF condition THEN <statements1> ELSE <statements2> END IF;
Notice that the IF and ELSE statements do not contain a semicolon The condition can be any expression that evaluates to a Boolean result You can also combine additional IF statements after the ELSE statement to continue the comparisons:
IF condition1 THEN <statements1> ELSE IF condition2 THEN <statements2> ELSE <statements3> END IF;
This series can continue to check each set of conditions If none of the conditions evaluates to a TRUE value, the ELSE statements are performed
Loop Statements
PL/pgSQL provides three ways to loop through data: The LOOP statement The WHILE loop The FOR loop The LOOP statement by itself provides a continuous loop:
LOOP <statements> EXIT [ WHEN expression]; END LOOP;
The statements inside the LOOP structure are executed continuously To exit this loop, you must execute an EXIT statement The EXIT statement may also include a WHEN clause The loop is followed until the WHEN clause expression returns a TRUE value
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Stored Procedures and Triggers
The WHILE loop works the opposite way The WHILE loop continues looping until an expression is FALSE:
WHILE condition LOOP <statements> END LOOP;
The FOR loop allows you to iterate through a set range of values:
FOR variable IN [REVERSE] value1value2 LOOP <statements> END LOOP;
The variable value is an integer that is incremented (or decremented if REVERSE is specified) by one in each loop iteration, starting at value1 and stopping after value2 The variable does not have to be declared within the function, but if it is not, it will only be available within the FOR loop There is another neat feature to the FOR loop in PL/pgSQL You can use it to iterate through a result set that returns more than a single data record The format for doing this is
FOR variable IN select_clause LOOP <statements> END LOOP;
The variable value must be defined with the %ROWTYPE attribute of the table used in the select_clause An example of this would be
customervar store"Customer"%ROWTYPE; FOR customervar IN SELECT * FROM store"Customer" LOOP <statements> END LOOP;
In this example, the customervar variable would contain the values of each record for each FOR loop iteration This is an extremely handy tool to have for evaluating data when a result set returns multiple records
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