Question

Doubles quotes for column name or table names in SQL Queries

Asked by: Thanks-in-advance

Which factor decides in PHP /QT applications to construct query with doubles quotes for column name or table names.

Some applications constructs query like (say MS access/Oracle)
SELECT "C1","C2" FROM "T1"
And same application generates query without double quotes for different ODBC driver(say Mysql)
SELECT C1,C2 FROM T1
 
Suppose if we write an sample ODBC application in QT as below

QSqlTableModel *model = new QSqlTableModel(table, db);
model->setEditStrategy(QSqlTableModel::OnRowChange);
model->setTable("myt");
model->select();

If the above piece of code is made to run for a database in mysql driver the driver trace file shows a query constructed like "SELECT c1, image FROM myt" in SQLExecDirect API.

But the same code run for a database in Microsoft access shows a query of the form "SELECT "c1", "image" FROM "myt" " .

Can anyone please tell how Qt decides the construction of queries with double quotes or without double quotes?

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Asked On
2008-07-16 at 00:11:04ID23568686
Tags

Trolleytech

,

QT

Topic

QT Programming Language

Participating Experts
1
Points
500
Comments
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Answers

 

by: angelIIIPosted on 2008-07-16 at 00:16:07ID: 22013841

the quotes are ONLY needed when handling special characters in the column or table names, like spaces for example, or reserved keywords as column/table names.
so, unless you need the quotes, don't use them.
FYI:
* mysql uses `table name`
* access and ms sql server use [table name]
* oracle uses "table name"
* ms sql server can use "table name" with QUOTED_IDENTIFER set to ON

20120131-EE-VQP-002

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