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When a variable is used with dbs, it should be preceded by a colon ‘:’.This representation of variable in EXEC SQL statement is called as Host Variable.When this block is executed, the cursor variable returns the required value, but the variable in the INTO clause remains null. For complete notes on programming in PL/SQL, we recommend the book Advanced PL/SQL: The Definitive Reference by Boobal Ganesan.
In other words, I want to assign a temporary password when I create the user and force the user to change it on their first login...We use this value to raise an exception of type CX_SY_NATIVE_SQL_ERROR.We can then catch the same exception and import the error message to display in our program. To indicate the ABAP processor that the following statement is native SQL statement and hence to bypass R/3 database interface, we need to precede such statement by EXEC SQL and followed by ENDEXEC as shown below: The addition PERFORMING is applicable only with the SELECT native SQL statement (also, not applicable in OO ABAP context) and calls the routine ABAP_ROUTINE after each successful call of SELECT statement.This addition is further explained in section “Selecting data from a table”.