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The central idea of embedded SQL is to blend SQL language statements directly into a program written in a host programming language, such as C, Java, Pascal, COBOL, FORTRAN, PL/I, or Assembler Embedded SQL uses the following techniques to embed the SQL statements: SQL statements are intermixed with statements of the host language in the source program This embedded SQL source program is submitted to a SQL precompiler (or in the case of Java, a preprocessor), which processes the SQL statements Variables of the host programming language can be referenced in the embedded SQL statements, allowing values calculated by the program to be used by the SQL statements Program language variables are also used by the embedded SQL statements to receive the results of SQL queries, allowing the program to use and process the retrieved values.

When a query produces an entire table of query results, embedded SQL must provide a way for the application program to process the query results one row at a time. Embedded SQL supports this capability by defining a new SQL concept, called a cursor, and adding several statements to the interactive SQL language. Here is an overview of

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Special program variables are used to assign NULL values to database columns and to support the retrieval of NULL values from the database Several new SQL statements that are unique to embedded SQL are added to the interactive SQL language, to provide for row-by-row processing of query results Figure 17-2 shows a simple embedded SQL program, written in C The program illustrates many, but not all, of the embedded SQL techniques The program prompts the user for an office number, retrieves the city, region, sales, and target for the office, and displays them on the screen Don t worry if the program appears strange, or if you can t understand all of the statements that it contains before reading the rest of this chapter.

embedded SQL techniques for multirow query processing and the new statements it requires: 1. The DECLARE CURSOR statement specifies the query to be performed and associates a cursor name with the query. 2. The OPEN statement asks the DBMS to start executing the query and generating query results. It positions the cursor before the first row of query results. 3. The FETCH statement advances the cursor to the first row of query results and retrieves its data into host variables for use by the application program. Subsequent FETCH statements move through the query results row by row, advancing the cursor to the next row of query results and retrieving its data into the host variables. 4. The CLOSE statement ends access to the query results and breaks the association between the cursor and the query results. Figure 17-23 shows a program that uses embedded SQL to perform a simple multirow query. The numbered callouts in the figure correspond to the numbers in the preceding steps. The program retrieves and displays, in alphabetical order, the name, quota, and year-to-date sales of each salesperson whose sales exceed quota. The interactive SQL query that prints this information is:

One of the disadvantages of the embedded SQL approach is that the source code for a program becomes an impure blend of two different languages, making the program hard to understand without training in both SQL and the programming language Another disadvantage is that embedded SQL uses SQL language constructs not used in interactive SQL, such as the WHENEVER statement and the INTO clause of the SELECT statement both used in this program..

Notice that this query appears, word for word, in the embedded DECLARE CURSOR statement in Figure 17-23. The statement also associates the cursor name repcurs with the query. This cursor name is used later in the OPEN CURSOR statement to start the query and position the cursor before the first row of query results. The FETCH statement inside the for loop fetches the next row of query results each time the loop is executed. The INTO clause of the FETCH statement works just like the INTO clause of the singleton SELECT statement. It specifies the host variables that are to receive the fetched data items one host variable for each column of query results. As in previous examples, a host indicator variable (repquota_ind) is used when a fetched data item may contain NULL values. When no more rows of query results are to be fetched, the DBMS returns the NOT FOUND warning in response to the FETCH statement. This is exactly the same warning code that is returned when the singleton SELECT statement does not retrieve a row of data. In this program, the WHENEVER NOT FOUND statement causes the precompiler to generate code that checks the SQLCODE value after the FETCH statement. This generated code branches to the label done when the NOT FOUND condition arises, and to the label error if an error occurs. At the end of the program, the CLOSE statement ends the query and terminates the program s access to the query results.

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