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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 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.

Identifies the statement handle that provides the context for the SQL statement execution Identifies the position of the host variable in the SQL statement Specifies whether the host variable is an in, out, or in/out variable Identifies the data type of the value supplied Identifies the data type of the host variable Specifies the column size of the host variable Specifies the number of digits to the right of the decimal required by the host variable Identifies the name of the host variable, as declared in the host program Specifies the length in octets (bytes) of the host variable Identifies the name of the indicator variable, as declared by the host program

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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 Note that an application plan is optimized for the database structure as it exists at the time the plan is placed in the database by the BIND program If the structure changes later (for example, if an index is dropped or a column is deleted from a table), any application plan that references the changed structures may become invalid.

To handle this situation, the DBMS usually stores, along with the application plan, a copy of the original SQL statements that produced it The DBMS also keeps track of all the database objects upon which each application plan depends If any of these objects are modified by a DDL statement, the DBMS can find the plans that depend on it and automatically mark those plans as invalid The next time the program tries to use the plan, the DBMS can detect the situation; in most cases, it will automatically rebind the statements to produce a new bind image Because the DBMS has.

Up to this point, the SQL statements that we ve executed in the CLI environment have not returned any data. However, you ll often run into situations where your program will need to query the database and process the values that are returned by that query. As a result, you ll need some sort of mechanism to bind the output from your query to variables that you declared in the host language. For example, suppose that you want to execute the following SELECT statement:

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maintained a great deal of information about the application plan, it can make this automatic rebinding completely transparent to the application program. However, a SQL statement may take much longer to execute when its plan is rebound than when the plan is simply executed. Although the DBMS can automatically rebind a plan when one of the structures upon which it depends is changed, the DBMS will usually not automatically detect changes in the database that may make a better plan possible. For example, suppose a plan uses a sequential scan of a table to locate particular rows because no appropriate index existed when it was bound. It s possible that a subsequent CREATE INDEX statement will create an appropriate index. To take advantage of the new structure, you must explicitly run the BIND program to rebind the plan.

SQLExecDirect ( hstmt, "SELECT CD_NAME, IN_STOCK FROM CD_INVENTORY", SQL_NTS );

The simplest SQL statements to embed in a program are those that are self-contained and do not produce any query results. For example, consider this interactive SQL statement: Delete all salespeople with sales under $150,000.

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