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hstmt 1 SQL_CHAR &v_CD_NAME 60 &ind_CD_NAME
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Identifies the statement handle that provides the context for the SQL statement execution Identifies the column as it is listed in the SELECT clause of the SELECT statement Identifies the data type of the host variable Identifies the name of the host variable, as declared in the host program Specifies the length in octets of the host variable Identifies the name of the indicator variable, as declared by the host program
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Using the SQL Call-Level Interface
In Try This 17-1, you used a text editing program to create embedded SQL statements. In this Try This exercise, you will perform similar actions except that you ll be defining the functions necessary to make CLI routine calls. As part of this process, you will establish the necessary allocation handles, create a connection to the database, set up SQL statement execution, bind host variables to SQL statements, and bind statement output to host variables. The CLI functions that you ll be using are those typically used in a C program. Keep in mind, however, that the CLI model supports many more functions than what we ve covered in this chapter, so be sure to check the appropriate documentation for details on functions other than those described here. You can download the Try_This_17_2.txt file, which contains the CLI function statements used in this exercise.
Step by Step
1. Open a text editing program such as Microsoft Notepad. 2. The first step that you must take is to establish an environment handle. You ll use the henv host
variable to set up the handle. Type the following function statement into your text document:
SQLAllocHandle ( SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv );
Notice that your functions include three arguments, enclosed in parentheses and separated by commas. Also notice that an ampersand is used for the host variable.
3. Now you can establish your connection environment. The connection environment will be
established within the context of the environment handle that you created in Step 2. Type the following function statement into your text document:
SQLAllocHandle ( SQL_HANDLE_DBC, henv, &hdbc );
As you can see, the henv host variable is used to indicate the environment handle, and the hdbc host variable is used to identify the connection handle.
4. Now that you ve established a connection handle, you can create the actual connection. For
this connection, you ll use DBServer as your SQL server, DBAdmin as the user account, and AdminPW as the password for that account. Type the following function statement into your text document:
SQLConnect ( hdbc, DBServer, SQL_NTS, DBAdmin, SQL_NTS, AdminPW, SQL_NTS );
Notice that the statement includes the SQL_NTS value to indicate that a string length does not have to be specified.
5. Next you ll establish your statement handle within the context of the connection you created
in step 3. Type the following function statement into your text document:
SQLAllocHandle ( SQL_HANDLE_STMT, hdbc, &hstmt );
As you can see, the hdbc host variable is used to identify the connection handle, and the hstmt variable is used to identify the statement handle.
(continued)
SQL: A Beginner s Guide
6. Now that you ve established your allocation handles and created your connection, you re
ready to execute an SQL statement. You ll use the ExecDirect( ) function to specify a DELETE statement. Type the following function statement into your text document:
SQLExecDirect ( hstmt, "DELETE FROM COMPACT_DISCS WHERE COMPACT_DISC_ID = 122", SQL_NTS );
The DELETE statement is included as one of the function s arguments. Notice that it is enclosed in double quotation marks. Also notice that the statement is being prepared within the context of the hstmt host variable, which is assigned to the statement environment.
7. In the last step, you executed your SQL statement in one step by using the ExecDirect( )
function. In this step, you will prepare an SQL statement for execution, but you will actually execute it in a later step. Type the following function statement into your text document:
SQLPrepare ( hstmt, "SELECT CD_TITLE, IN_STOCK FROM COMPACT_DISCS WHERE COMPACT_DISC_ID = ", SQL_NTS );
Notice that the WHERE clause of the SELECT statement includes a question mark to indicate that a value will be passed into the statement through a host variable.
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