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Let s take a look at an example of the ExecDirect( ) function to demonstrate how you can use it to execute an SQL statement. The following function references the hstmt statement handle and defines a DELETE statement:

DELETE with Subquery*

DELETE statements with simple search conditions, such as those in the previous examples, select rows for deletion based solely on the contents of the rows themselves. Sometimes the selection of rows must be made based on data from other tables. For example, suppose you want to delete all orders taken by Sue Smith. Without knowing her employee number, you can t find the orders by consulting the ORDERS table alone. To find the orders, you could use a two-table query: Find the orders taken by Sue Smith.

SQLExecDirect ( hstmt, "DELETE FROM CD_INVENTORY WHERE CD_ID = 5731", SQL_NTS );

SELECT FROM WHERE AND ORDER_NUM, AMOUNT ORDERS, SALESREPS REP = EMPL_NUM NAME = 'Sue Smith';

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ORDER_NUM AMOUNT ---------- ----------112979 $15,000.00 113065 $2,130.00 112993 $1,896.00 113048 $3,750.00

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As you can see, the SQL statement is passed as an argument to the CLI routine. In this case, any rows with a CD_ID value of 5731 will be deleted from the CD_INVENTORY table. Notice that the SQL_NTS value is used to indicate that you do not have to specify the length of the string (the actual SQL statement).

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Another method that you can use to execute a statement is to first prepare the statement and then later execute it. You would use this method if you need to execute your statement more than one time. The first function that you use in the two-step process is the Prepare( ) function, which requires the same three arguments as the ExecDirect( ) function, as shown in the following example:

Data definition SQL lets a user define the structure and organization of the stored data and relationships among the stored data items Data retrieval SQL allows a user or an application program to retrieve stored data from the database and use it Data manipulation SQL allows a user or an application program to update the database by adding new data, removing old data, and modifying previously stored data Access control SQL can be used to restrict a user s ability to retrieve, add, and modify data, protecting stored data against unauthorized access Data sharing SQL is used to coordinate data sharing by concurrent users, ensuring that changes made by one user do not inadvertently wipe out changes made at nearly the same time by another user Data integrity SQL defines integrity constraints in the database, protecting it from corruption due to inconsistent updates or system failures.

SQL is thus a comprehensive language for controlling and interacting with a database management system Second, SQL is not really a complete computer language like COBOL, C, C++, or Java Instead, SQL is a database sublanguage, consisting of about 40 statements specialized for database management tasks These SQL statements can be embedded into another language such as COBOL or C to extend that language for use in database access Alternatively, the statements can be explicitly sent to a database management system for processing, via a call-level interface from a language such as C, C++, or Java, or via messages sent over a computer network SQL also differs from other computer languages because it describes what the user wants the computer to do rather than how the computer should do it (In more technical terms, SQL is a declarative or descriptive language rather than a procedural one.

SQLPrepare ( hstmt, "DELETE FROM CD_INVENTORY WHERE CD_ID = 5731", SQL_NTS );

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