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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.

More complex constraints, such as business rules constraints, are not specified by the ANSI/ISO standard, and there is a wide variation in the techniques and SQL syntax used to support them The SQL features that support the first five integrity constraints are described in this chapter The SQL transaction mechanism, which supports the consistency constraint, is described in 12..

16:

When you use interactive SQL, the DBMS enforces its security based on the user-id you supply to the interactive SQL program. You can type any SQL statement you want, but the privileges granted to your user-id determine whether the DBMS will or will not

In an Oracle database, the system views named ALL_TABLES, DBA_TABLES, and USER_TABLES, described in Table 16-3, perform a similar function to the DB2 SYSCAT.TABLES view. The ALL_TABLES view contains one row for each database table

17:

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Column Name OWNER TABLE_NAME TABLESPACE_ NAME CLUSTER_NAME IOT_NAME STATUS PCT_FREE PCT_USED INI_TRANS MAX_TRANS INITIAL_EXTENT NEXT_EXTENT MIN_EXTENTS MAX_EXTENTS NUM_ROWS BLOCKS EMPTY_BLOCKS AVG_SPACE PARTITIONED TEMPORARY

execute the statement you type When you run a program that uses embedded SQL, there are two user-ids to consider: I The user-id of the person who developed the program, or more specifically, the person who ran the BIND program to create the application plan I The user-id of the person who is now executing the program and the corresponding application plan It may seem strange to consider the user-id of the person who ran the BIND program (or more generally, the person who developed the application program or installed it on the computer system), but in fact, DB2 and several other commercial SQL products use both user-ids in their security scheme To understand how the security scheme works, suppose that user JOE runs the ORDMAINT order maintenance program, which updates the ORDERS, SALES, and OFFICES tables.

TABLE 16-3

The simplest data integrity constraint requires that a column contain a non-NULL value. The ANSI/ISO standard and most commercial SQL products support this constraint by allowing you to declare that a column is NOT NULL when the table containing the column is first created. The NOT NULL constraint is specified as part of the CREATE TABLE

The application plan for the ORDMAINT program was originally bound by user-id OPADMIN, which belongs to the order-processing administrator In the DB2 scheme, each application plan is a database object, protected by DB2 security To execute a plan, JOE must have the EXECUTE privilege for it If he does not, execution fails immediately As the ORDMAINT program executes, its embedded INSERT, UPDATE, and DELETE statements update the database The privileges of the OPADMIN user determine whether the plan will be allowed to perform these updates Note that the plan may update the tables even if JOE does not have the required privileges However, the updates that can be performed are only those that have been explicitly coded into the embedded SQL statements of the program Thus, DB2 provides very fine control over database security.

Data Type VARCHAR2(30) VARCHAR2(30) VARCHAR2(30) VARCHAR2(30) VARCHAR2(30) VARCHAR2(8) NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER VARCHAR2(3) VARCHAR2(1)

The privileges of users to access tables can be very limited, without diminishing their ability to use canned programs Not all DBMS products provide security protection for application plans For those that do not, the privileges of the user executing an embedded SQL program determine the privileges of the program s application plan Under this scheme, the user must have privileges to perform all of the actions performed by the plan, or the program will fail If the user is not to have these same permissions in an interactive SQL environment, access to the interactive SQL program itself must be restricted, which is a disadvantage of this approach..

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