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Full Discussion: Read SQL statement in Script
Top Forums Shell Programming and Scripting Read SQL statement in Script Post 302527100 by freakygs on Thursday 2nd of June 2011 11:34:50 AM
Old 06-02-2011
Read SQL statement in Script

Hi Guys..

need some urgent help... I am stuck in something badly

I need to write a script which would read a sql statement (which might be a join/inner join/select/sub select etc. )

I need to read that sql statement ... and in the output I want all the table names and columns (doesn't matter if the columns are used in select or where or join) used in that script....


ex.

Code:
SQL:
select a.empno, b.deptname from emp a inner join dept b on a.deptno=b.deptno where a.salary in (select salary from sal where salary>1000)

(I know its a bad query, but just an example)
Please also remember that there can be several sub selects in a single select


Code:
Output:

TABLENAME 	COLUMNNAME
emp		empno
emp		deptno
emp		salary
dept		deptname
dept		deptno
sal		salary

Any help would be great.. Smilie
Thanks a lot...
 

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PDO.QUERY(3)								 1							      PDO.QUERY(3)

PDO
::query - Executes an SQL statement, returning a result set as a PDOStatement object SYNOPSIS
public PDOStatement PDO::query (string $statement) DESCRIPTION
PDOStatement PDO::query (string $statement, int $PDO::FETCH_COLUMN, int $colno) PDOStatement PDO::query (string $statement, int $PDO::FETCH_CLASS, string $classname, array $ctorargs) PDOStatement PDO::query (string $statement, int $PDO::FETCH_INTO, object $object) PDO.query(3) executes an SQL statement in a single function call, returning the result set (if any) returned by the statement as a PDOStatement object. For a query that you need to issue multiple times, you will realize better performance if you prepare a PDOStatement object using PDO.pre- pare(3) and issue the statement with multiple calls to PDOStatement.execute(3). If you do not fetch all of the data in a result set before issuing your next call to PDO.query(3), your call may fail. Call PDOState- ment.closeCursor(3) to release the database resources associated with the PDOStatement object before issuing your next call to PDO.query(3). Note Although this function is only documented as having a single parameter, you may pass additional arguments to this function. They will be treated as though you called PDOStatement.setFetchMode(3) on the resultant statement object. PARAMETERS
o $statement - The SQL statement to prepare and execute. Data inside the query should be properly escaped. RETURN VALUES
PDO.query(3) returns a PDOStatement object, or FALSE on failure. EXAMPLES
Example #1 Demonstrate PDO::query A nice feature of PDO.query(3) is that it enables you to iterate over the rowset returned by a successfully executed SELECT state- ment. <?php function getFruit($conn) { $sql = 'SELECT name, color, calories FROM fruit ORDER BY name'; foreach ($conn->query($sql) as $row) { print $row['name'] . " "; print $row['color'] . " "; print $row['calories'] . " "; } } ?> The above example will output: apple red 150 banana yellow 250 kiwi brown 75 lemon yellow 25 orange orange 300 pear green 150 watermelon pink 90 SEE ALSO
PDO.exec(3), PDO.prepare(3), PDOStatement.execute(3). PHP Documentation Group PDO.QUERY(3)
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