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The SQL Server technique for handling programmatic queries is very similar to its technique for handling other SQL statements. To perform a query, a program sends a SELECT statement to SQL Server and uses dblib to retrieve the query results row by row. The program in Figure 19-7 illustrates the SQL Server query-processing technique. 1. The program uses the dbcmd() and dbsqlexec() calls to pass a SELECT statement to SQL Server and request its execution. 2. When the program calls dbresults() for the SELECT statement, dblib returns the completion status for the query and also makes the query results available for processing. 3. The program calls dbbind() once for each column of query results, telling dblib where it should return the data for that particular column. The arguments to dbbind() indicate the column number, the buffer to receive its data, the size of the buffer, and the expected data type. 4. The program loops, calling dbnextrow() repeatedly to obtain the rows of query results. The API places the returned data into the data areas indicated in the previous dbbind() calls.

The CREATE TABLE statement for a given table can vary slightly from one DBMS brand to another, because each DBMS supports its own set of data types and uses its own keywords to identify them in the column definitions. In addition, the SQL2 standard allows you to specify a domain instead of a data type within a column definition (domains were described in 11). A domain is a specific collection of valid data values, which is defined within the database and assigned a name. The domain definition is based on one of the DBMS's supported data types but performs additional data value checking that restricts the legal values. For example, if this domain definition appeared in a SQL2compliant database: CREATE DOMAIN VALID_OFICE_ID INTEGER

Dynamic SQL*

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These differences include Oracle s use of parameter markers, its use of the SQLDA, the format of its SQLDA, and its support for data type conversion. The Oracle differences from DB2 are similar to those you may encounter in other DBMS brands. For that reason, it is instructive to briefly examine Oracle s dynamic SQL support and its points of difference from DB2. Recall that DB2 does not allow host variable references in a dynamically prepared statement. Instead, parameters in the statement are identified by question marks (parameter markers), and values for the parameters are specified in the EXECUTE or OPEN statement. Oracle allows you to specify parameters in a dynamically prepared statement using the syntax for host variables. For example, this sequence of embedded SQL statements is legal for Oracle:

As the example shows, there are times when it would be convenient if the referential integrity constraint were not checked until after a series of interrelated updates are performed. Unfortunately, this type of complex deferred checking is not provided by most current SQL implementations. Some deferred checking capabilities are specified by the SQL2 standard, as described later in the Deferred Constraint Checking section. Referential cycles also restrict the delete and update rules that can be specified for the relationships that form the cycle. Consider the three tables in the referential cycle shown in Figure 11-6. The PETS table shows three pets and the boys they like, the GIRLS table shows three girls and the pets they like, and the BOYS table shows four boys and the girls they like, forming a referential cycle. All three of the relationships in the cycle specify the RESTRICT delete rule. Note that George s row is the only row you can delete from the three tables. Every other row is the parent in some relationship and is therefore protected from deletion by the RESTRICT rule. Because of this anomaly, you should not specify the RESTRICT rule for all of the relationships in a referential cycle.

exec sql begin declare section; char stmtbuf[1001]; int employee_number; exec sql end declare section; . . . strcpy(stmtbuf, "delete from salesreps where empl_num = :rep_number;"); exec sql prepare delstmt from :stmtbuf; exec sql execute delstmt using :employee_number;

Figure 11-6.

atabase management systems organize and structure data so that it can be saved and retrieved by users and application programs. The data structures and access techniques provided by a particular DBMS are called its data model. A data model determines both the personality of a DBMS and the applications for which it is particularly well-suited. SQL is a database language for databases that use the relational data model. What exactly is a relational database How is data stored in a relational database How do relational databases compare with earlier technologies, such as hierarchical and network databases What are the advantages and disadvantages of the relational model This chapter describes the relational data model supported by SQL and compares it with earlier strategies for database organization.

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