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FIGURE 17-12

Dynamic SQL *

standard, but is not required or allowed in Entry SQL. Figure 17-14 shows a C program excerpt like that in Figure 17-12, extended to include the GET DIAGNOSTICS statement.

Just as the delete rule tells the DBMS what to do when a user tries to delete a row of the parent table, the update rule tells the DBMS what to do when a user tries to update the value of one of the primary key columns in the parent table Again, there are four possibilities, paralleling those available for delete rules: The RESTRICT update rule prevents you from updating the primary key of a row in the parent table if that row has any children An UPDATE statement that attempts to modify the primary key of such a parent row is rejected with an error message Changes to primary keys in 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 change an office number if salespeople are assigned to the office.

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However, you cannot use a host variable in place of a table name or a column reference. The attempted use of the host variables which_table and which_column in these statements is illegal:

It quickly becomes tedious for a programmer to write programs that explicitly check the SQLCODE value after each embedded SQL statement. To simplify error handling, embedded SQL supports the WHENEVER statement, shown in Figure 17-15. The WHENEVER statement is a directive to the SQL precompiler, not an executable statement. It tells the precompiler to automatically generate error-handling code following every executable embedded SQL statement and specifies what the generated code should do. You can use the WHENEVER statement to tell the precompiler how to handle three different exception conditions: WHENEVER SQLERROR tells the precompiler to generate code to handle errors (negative SQLCODEs). WHENEVER SQLWARNING tells the precompiler to generate code to handle warnings (positive SQLCODEs). WHENEVER NOT FOUND tells the precompiler to generate code that handles a particular warning the warning generated by the DBMS when your program tries to retrieve query results when no more are remaining. This use of the WHENEVER statement is specific to the singleton SELECT and the FETCH statements, and is described in the section Single-Row Queries later in this chapter.

exec sql update :which_table set :which_column = 0; exec sql declare cursor cursor7 for select * from :which_table;

Part V:

To retrieve statement-level information and determine the number of diagnostic errors: GET DIAGNOSTICS hostvar = NUMBER MORE COMMAND_FUNCTION COMMAND_FUNCTION_CODE DYNAMIC_FUNCTION DYNAMIC_FUNCTION_CODE ROW_COUNT TRANSACTIONS_COMMITTED TRANSACTIONS_ROLLED_BACK TRANSACTIONS_ACTIVE

Even if you could use a host variable in this way (and you cannot), another problem would immediately arise. The number of columns produced by the query in the second statement would vary, depending on which table was specified by the host variable. For the OFFICES table, the query results would have six columns; for the SALESREPS table, they would have nine columns. Furthermore, the data types of the columns would be different for the two tables. But to write a FETCH statement for the query, you must know in advance how many columns of query results there will be and their data types, because you must specify a host variable to receive each column:

To retrieve information about an individual diagnostic error: GET DIAGNOSTICS EXCEPTION err_number hostvar CATALOG_NAME CLASS_ORIGIN COLUMN_NAME CONDITION_NUMBER CONNECTION_NAME CONSTRAINT_CATALOG CONSTRAINT_NAME CONSTRAINT_SCHEMA CURSOR_NAME MESSAGE_LENGTH MESSAGE_OCTET_LENGTH MESSAGE_TEXT PARAMETER_MODE PARAMETER_NAME PARAMETER_ORDINAL_POSITION RETURNED_SQLSTATE ROUTINE_CATALOG ROUTINE_NAME ROUTINE_SCHEMA SCHEMA_NAME SERVER_NAME SPECIFIC_NAME SUBCLASS_ORIGIN TABLE_NAME TRIGGER_CATALOG TRIGGER_NAME TRIGGER_SCHEMA

" The CASCADE update rule tells the DBMS that when a primary key value is changed in a parent row, the corresponding foreign key value in all of its child rows should also automatically be changed in the child table, to match the new primary key For Figure 11-1, this rule can be summarized as "Changing an office number automatically changes the office number for all the salespeople assigned to that office" The SET NULL update rule tells the DBMS that when a primary key value in a parent row is updated, the foreign key values in all of its child rows should automatically be set to NULL Primary key changes in the parent table thus cause a "set to NULL" update on selected columns of the child table.

exec sql fetch cursor7 into :var1, :var2, :var3;

FIGURE 17-13

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