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After you establish the connection handle, you must explicitly connect to the database within the context of the handle. To do this, you must use the SQLConnect( ) function, which takes seven arguments: the connection handle, the target SQL server, the length of the server name, the connection user, the length of the username, the connection password, and the length of the password. For C strings, you can use SQL_NTS in place of length arguments to indicate that a length does not have to be specified for the preceding string, as shown in the following example:

figure are actually those used by the IBM mainframe databases (DB2 and SQL/DS), but all products that support embedded SQL use a similar process: 1. The embedded SQL source program is submitted to the SQL precompiler, a programming tool. The precompiler scans the program, finds the embedded SQL statements, and processes them. A different precompiler is required for each programming language supported by the DBMS. Commercial SQL products typically offer precompilers for one or more languages, including C, Pascal, COBOL, FORTRAN, Ada, PL/I, RPG, and various assembly languages. 2. The precompiler produces two files as its output. The first file is the source program, stripped of its embedded SQL statements. In their place, the precompiler substitutes calls to the private DBMS routines that provide the runtime link between the program and the DBMS. Typically, the names and calling sequences of these routines are known only to the precompiler and the DBMS; they are not a public interface to the DBMS. The second file is a copy of all the embedded SQL statements used in the program. This file is sometimes called a database request module (DBRM). 3. The source file output from the precompiler is submitted to the standard compiler for the host programming language (such as a C or COBOL compiler). The compiler processes the source code and produces object code as its output. Note that this step has nothing in particular to do with the DBMS or with SQL.

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Part V:

SQLConnect ( hdbc, server01, SQL_NTS, SaleMngr, SQL_NTS, SalesPW, SQL_NTS );

4 The linker accepts the object modules generated by the compiler, links them with various library routines, and produces an executable program The library routines linked into the executable program include the private DBMS routines described in Step 2 5 The database request module generated by the precompiler is submitted to a special BIND program This program examines the SQL statements; parses, validates, and optimizes them; and produces an application plan for each statement The result is a combined application plan for the entire program, representing a DBMS-executable version of its embedded SQL statements The BIND program stores the plan in the database, usually assigning it the name of the application program that created it SQLJ programs follow a simpler process, largely because Java is not linked prior to execution: 1 The Java program with embedded SQL is submitted to an SQLJ preprocessor (also called a translator).

The translator, also written in Java, produces a java file, which contains the Java source program with the SQL statements translated into standard Java code (usually in the form of JDBC API calls), and one or more SQLJ profiles, which contain information about the SQL operations 2 The Java compiler processes the java file and produces class files 3 The link and bind steps are not required 4 A runtime component is invoked automatically each time the application is run It uses the SQLJ profiles to assist in completing the SQL commands included in the original source program The program development steps in Figure 17-3 correlate with the DBMS statement processing steps in Figure 17-1 In particular, the precompiler usually handles statement parsing (the first step), and the BIND utility handles verification, optimization, and plan generation (respectively, the second, third, and fourth steps).

As you can see, the function specifies the hdbc connection handle and the server01 SQL server. The connection will be established using the SaleMngr user account and the SalesPW password. Instead of specifying the length of any of the strings, SQL_NTS is used. Once you ve connected to the database, you can create statement handles and execute SQL statements.

Thus, the first four steps of Figure 17-1 all take place at compile-time when you use embedded SQL Only the fifth step, the actual execution of the application plan, remains to be done at runtime The embedded SQL development process turns the original embedded SQL source program into two executable parts: An executable program executable program Stored in a file on the computer in the same format as any Stored within the database in the format expected.

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