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statement that establishes a rule for the QUOTA column in the SALESREPS table: CREATE RULE QUOTA_LIMIT AS @VALUE BETWEEN 0.00 AND 500000.00 This rule prevents you from inserting or updating a quota to a negative value or to a value greater than $500,000. As shown in the example, SQL Server allows you to assign the rule a name (QUOTA_LIMIT in this example). Like DB2 validation procedures, however, SQL Server rules may not reference columns or other database objects. The SQL2 standard provides extended support for validity checking through two different features column check constraints and domains. Both give the database creator a way to tell the DBMS how to determine whether or not a data value is valid. The checkconstraint feature specifies the data validity test for a single column. The domain feature lets you specify the validity test once, and then reuse it in the definition of many different columns whose legal data values are the same.

17:

List the owner, view name, column name, data type, and length for all text columns longer than ten characters de ned in views.

Figure 17-8.

SELECT FROM WHERE AND AND AND AND DEFINER, COLS.TABNAME, COLNAME, TYPENAME, LENGTH SYSCAT.COLUMNS COLS, SYSCAT.TABLES TBLS TBLS.TABSCHEMA = COLS.TABSCHEMA TBLS.TABNAME = COLS.TABNAME (TYPENAME = 'VARCHAR' OR TYPENAME = 'CHARACTER') LENGTH > 10 TYPE = 'V';

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I Compile-time errors. Misplaced commas, misspelled SQL keywords, and similar errors in embedded SQL statements are detected by the SQL precompiler and reported to the programmer. The programmer can fix the errors and recompile the application program. I Runtime errors. An attempt to insert an invalid data value or lack of permission to update a table can be detected only at runtime. Errors such as these must be detected and handled by the application program. In embedded SQL programs, the DBMS reports runtime errors to the application program through a returned error code. If an error is detected, a further description of the error and other information about the statement just executed is available through additional diagnostic information. The earliest IBM-embedded SQL implementations defined an error-reporting mechanism that was adopted, with variations, by most of the major DBMS vendors. The central part of this scheme an error status variable named SQLCODE was also defined in the original ANSI/ISO SQL standard. The SQL2 standard, published in 1992, defined an entirely new, parallel error-reporting mechanism, built around an error status variable named SQLSTATE. These mechanisms are described in the next two sections.

The way the column definition is provided by the system catalogs of various DBMS brands varies considerably. For comparison, Table 16-6 shows the definition of the Informix Universal Server SYSCOLUMNS table. Some of the differences between the column information in the tables are simply matters of style: The names of the columns in the two tables are completely different, even when they contain similar data. The DB2 catalog uses a combination of the schema name and table name to identify the table containing a given column; the Informix catalog uses an internal table-id number, which is a foreign key to its SYSTABLES table.

Under this scheme, pioneered by the earliest IBM products, the DBMS communicates status information to the embedded SQL program through an area of program storage called the SQL Communications Area, or SQLCA. The SQLCA is a data structure that contains error variables and status indicators. By examining the SQLCA, the application program can determine the success or failure of its embedded SQL statements and act accordingly.

Information Name of the column Internal table-id of table containing column Position of column in table Data type of column and whether NULLs are allowed Column length in bytes Minimum column length in bytes Maximum column length in bytes Internal ID of extended data type For projected columns, the label ID of the column s security label

Column Check Constraints (SQL2)

Notice in Figures 17-4, 17-5, 17-6, and 17-7 that the first embedded SQL statement in the program is INCLUDE SQLCA. This statement tells the SQL precompiler to include a SQL Communications Area in this program. The specific contents of the SQLCA vary slightly from one brand of DBMS to another, but the SQLCA always provides the same type of information. Figure 17-9 shows the definition of the SQLCA used by the IBM databases. The most important part of the SQLCA, the SQLCODE variable, is supported by all of the major embedded SQL products and was specified by the ANSI/ISO SQL1 standard. As the DBMS executes each embedded SQL statement, it sets the value of the variable SQLCODE in the SQLCA to indicate the completion status of the statement:

TABLE 16-6

struct sqlca { unsigned char sqlcaid[8]; long long short unsigned unsigned long unsigned unsigned } #define SQLCODE sqlca.sqlcode sqlcabc; sqlcode; sqlerrml; sqlerrmc[70]; sqlerrp[8]; sqlerrd[6]; sqlwarn[8]; sqlext[8];

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