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SQL is not itself a database management system, nor is it a stand-alone product. You cannot go into a computer store and buy SQL. Instead, SQL is an integral part of a database management system, a language and a tool for communicating with the DBMS. Figure 1-2 shows some of the components of a typical DBMS, and how SQL acts as the glue that links them together. The database engine is the heart of the DBMS, responsible for actually structuring, storing, and retrieving the data in the database. It accepts SQL requests from other DBMS components such as a forms facility, report writer, or interactive query facility from user-written application programs, and even from other computer systems. As the figure shows, SQL plays many different roles: I SQL is an interactive query language. Users type SQL commands into an interactive SQL program to retrieve data and display it on the screen, providing a convenient, easy-to-use tool for ad hoc database queries. I SQL is a database programming language. Programmers embed SQL commands into their application programs to access the data in a database. Both userwritten programs and database utility programs (such as report writers and data entry tools) use this technique for database access. I SQL is a database administration language. The database administrator responsible for managing a minicomputer or mainframe database uses SQL to define the database structure and control access to the stored data. I SQL is a client/server language. Personal computer programs use SQL to communicate over a network with database servers that store shared data. This client/server architecture has become very popular for enterprise-class applications.

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FWIW, that is an extremely poor barcode generation routine and you should ... for a library that has been specifically written to generate these barcodes . ... The next problem is that the code uses an integer bar width and casts ...

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Four types of database updates can corrupt the referential integrity of the parent/child relationships in a database Using the OFFICES and SALESREPS tables in Figure 11-1 as illustrations, these four update situations are: Inserting a new child row When an INSERT statement adds a new row to the child (SALESREPS) table, its foreign key (REP_OFFICE) value must match one of the primary key (OFFICE) values in the parent table (OFFICES) If the foreign key value does not match any primary key, inserting the row will corrupt the database, because there will be a child without a parent (an "orphan") Note that inserting a row in the parent table never poses a problem; it simply becomes a parent without any children Updating the foreign key in a child row This is a different form of the previous problem.

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Code 128 is a high-density linear barcode symbology defined in ISO/IEC 15417:2007. It is used for alphanumeric or numeric-only barcodes. It can encode all 128 characters of ASCII and, by use of an extension symbol (FNC4), the Latin-1 characters defined in ISO/IEC 8859-1.

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Developers can also generate linear Code 128 barcode images in ASP.NET Web applications using this barcode creator control SDK. High-quality Code 128A, Code 128B and Code 128C barcodes can be easily created in ASP.NET websites with component drag-and-drop or Visual C# class library and console applications.

made invisible to the application programmer. The process does have several major advantages from a DBMS point of view, as follows: The blending of SQL and programming language statements in the embedded SQL source program is an effective way to merge the two languages. The host programming language provides flow of control, variables, block structure, and input/output functions; SQL handles database access and does not have to provide these other constructs. The use of a precompiler means that the compute-intensive work of parsing and optimization can take place during the development cycle. The resulting executable program is very efficient in its use of CPU resources. The database request module produced by the precompiler provides portability of applications. An application program can be written and tested on one system, and then its executable program and DBRM can be moved to another system. After the BIND program on the new system creates the application plan and installs it in the database, the application program can use it without being recompiled itself. The program s actual runtime interface to the private DBMS routines is completely hidden from the application programmer. The programmer works with embedded SQL at the source-code level and does not have to worry about other, more complex interfaces.

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Recall from Figure 17-3 that the embedded SQL development process produces two executable components, the executable program itself and the program s application plan, stored in the database. When you run an embedded SQL program, these two components are brought together to do the work of the application: 1. When you ask the computer system to run the program, the computer loads the executable program in the usual way and begins to execute its instructions. 2. One of the first calls generated by the precompiler is a call to a DBMS routine that finds and loads the application plan for the program. 3. For each embedded SQL statement, the program calls one or more private DBMS routines, requesting execution of the corresponding statement in the application plan. The DBMS finds the statement, executes that part of the plan, and then returns control to the program. 4. Execution continues in this way, with the executable program and the DBMS cooperating to carry out the task defined by the original embedded SQL source program.