vb.net 2d barcode dll Passing Data Values from One SQL Statement to Another in Java

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Passing Data Values from One SQL Statement to Another
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More complex SQL*Plus scripts are likely to be comprised of several SQL statements, and sometimes it is useful to extract data from the database and pass that data to another SQL statement or SQL*Plus command. A good example of this might be naming an output file spooled from the script by including the name of the database instance along with today s date. Another example of this might be when data is extracted with one query and passed to anther query.
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Mechanism 1: The NEW_VALUE Clause
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There are two mechanisms for passing values between SQL statements, the first using SQL*Plus substitution variables and the second by using SQL*Plus bind variables. With substitution variables, you
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WRITING AND AUTOMATING SQL*PLUS SCRIPTS
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can use the COLUMN NEW_VALUE command to save the last value retrieved from a SELECT statement into a substitution variable. Listing 11-43 shows an example of using the NEW_VALUE clause. Listing 11-43. Passing Data Values from One SQL Statement to Another Using Substitution Variables define V_HIRE_DT= &1 column empno new_value V_EMPNO select empno from employees where hire_date >= to_date( &&V_HIRE_DT , DD-MON-YYYY ) and hire_date < to_date( &&V_HIRE_DT , DD-MON-YYYY ) + 1; select ename from employees where empno = &&V_EMPNO; Here, the COLUMN EMPNO command specifies that the last value retrieved (NEW_VALUE) will be stored in a SQL*Plus substitution variable named V_EMPNO. So, in this example, we run the query against the EMPLOYEES table for the employees hired on the date specified by the substitution variable V_HIRE_DT, then the last EMPNO column value retrieved is saved into the V_EMPNO substitution variable. Then, the V_EMPNO substitution variable can be used in the WHERE clause of the subsequent SQL statement, as shown in Listing 11-43. Obviously, there are limitations. If the first query returns more than one row, then only the value from the last row will be retained in the substitution variable and passed to the second query. So, it is far from perfect, but it has its uses. If all rows retrieved need to be passed to the second query, then the best method would be either to rewrite the SQL so that both steps are performed in the same SQL statement or to glue the two SQL statements together within a PL/SQL program using PL/SQL collections.
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Mechanism 2: Bind Variables
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Another technique of passing data values between SQL statements in a SQL*Plus script involves the use of SQL*Plus bind variables. Unlike substitution variables, bind variables act like bind variables in PL/SQL programs or other programming languages such as Java, C/C++, Perl, or others. That is, unlike substitution variables which are resolved within SQL*Plus before a SQL statement is sent down to the database engine, bind variables are sent down to the database engine and resolved there. So, they can be used only for bind values in SQL statement SELECT, WHERE, GROUP BY, ORDER BY, SET, and VALUES clauses, and they cannot be used to replace the actual keywords or column names or table names in a SQL statement, as substitution variables can. Bind variables must first be declared with a VARIABLE command. Once you ve done that, you can use bind variables to generate data in one statement and use it in another, as shown in Listing 11-44. Listing 11-44. Passing Data Values from One SQL Statement to Another Using Bind Variables variable v_empno number select empno into :v_empno from employees where hire_date >= to_date( &&V_HIRE_DT , DD-MON-YYYY ) and hire_date < to_date( &&V_HIRE_DT , DD-MON-YYYY ) + 1; select ename from employees where empno = :v_empno;
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WRITING AND AUTOMATING SQL*PLUS SCRIPTS
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So, in Listing 11-44, we declare a bind variable named v_empno as a numeric datatype, and then populate it using the INTO clause of a SELECT statement which queries from the EMPLOYEE table. Please note the leading full-colon (:) character used to denote a bind variable.
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