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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** GNU Free Documentation License
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms
** and conditions contained in a signed written agreement between you
** and Nokia.
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page sql-types.html
\title Data Types for Qt-supported Database Systems
\brief Recommended data types for database systems
\ingroup qt-sql
\section1 Recommended Data Types for Qt-Supported Database Systems
This table shows the recommended data types for extracting data from
the databases supported in Qt. Note that types used in Qt are not
necessarily valid as input types to a specific database
system. e.g., A double might work perfectly as input for floating
point records in a particular database, but not necessarily as a
storage format for output from that database, because it would be
stored with 64-bit precision in C++.
\tableofcontents
\section2 IBM DB2 Data Types
\table 90%
\header
\o IBM DB2 data type
\o SQL type description
\o Recommended input (C++ or Qt data type)
\row
\o SMALLINT
\o 16-bit signed integer
\o typedef qint16
\row
\o INTEGER
\o 32-bit signed integer
\o typedef qint32
\row
\o BIGINT
\o 64-bit signed integer
\o typedef qint64
\row
\o REAL
\o 32-bit Single-precision floating point
\o By default mapping to QString
\row
\o DOUBLE PRECISION
\o 64-bit Double-precision floating point
\o By default mapping to QString
\row
\o FLOAT
\o 64-bit Double-precision floating point
\o By default mapping to QString
\row
\o CHAR
\o Fixed-length, null-terminated character string
\o Mapped to QString
\row
\o VARCHAR
\o Null-terminated varying length string
\o Mapped to QString
\row
\o LONG VARCHAR
\o Not null-terminated varying length character string
\o Mapped to QString
\row
\o BLOB
\o Not null-terminated varying binary string with 4-byte string
length indicator
\o Mapped to QByteArray
\row
\o CLOB
\o Character large string object
\o Mapped to QString
\row
\o DATE
\o Null-terminated character string of the following format:
yyyy-mm-dd
\o Mapped to QDate
\row
\o TIME
\o Null-terminated character string of the following format: hh.mm.ss
\o Mapped to QTime
\row
\o TIMESTAMP
\o Null-terminated character string of the following format: yyyy-mm-dd-hh.mm.ss.nnnnnn
\o Mapped to QDateTime
\endtable
\section2 Borland InterBase Data Types
\table 90%
\header
\o Borland InterBase data type
\o SQL type description
\o Recommended input (C++ or Qt data type)
\row
\o BOOLEAN
\o Boolean
\o bool
\row
\o TINYINT
\o 8 bit signed integer
\o typedef qint8
\row
\o SMALLINT
\o 16-bit signed integer
\o typedef qint16
\row
\o INTEGER
\o 32-bit signed integer
\o typedef qint32
\row
\o BIGINT LONG
\o 64-bit signed integer
\o typedef qint64
\row
\o REAL FLOAT
\o 32-bit floating point
\o By default mapping to QString
\row
\o FLOAT
\o 64-bit floating point
\o By default mapping to QString
\row
\o DOUBLE
\o 64-bit floating point
\o By default mapping to QString
\row
\o DOUBLE PRECISION
\o 64-bit Double-precision floating point
\o By default mapping to QString
\row
\o VARCHAR STRING
\o Character string, Unicode
\o Mapped to QString
\row
\o CLOB
\o Character large string object
\o Mapped to QString
\row
\o DATE
\o Displays date. Format: 'yyyy-mm-dd'
\o Mapped to QDate
\row
\o TIME
\o Displays time. Format is 'hh:mm:ss' in 24-hour format
\o Mapped to QTime
\row
\o TIMESTAMP
\o Displays a timestamp. Format is 'yyyy-mm-dd hh:mm:ss'
\o Mapped to QDateTime
\endtable
\section2 MySQL Data Types
\table 90%
\header
\o MySQL data type
\o SQL type description
\o Recommended input (C++ or Qt data type)
\row
\o TINYINT
\o 8 bit signed integer
\o typedef qint8
\row
\o TINYINT UNSIGNED
\o 8 bit unsigned integer
\o typedef quint8
\row
\o SMALLINT
\o 16-bit signed integer
\o typedef qint16
\row
\o SMALLINT UNSIGNED
\o 16-bit unsigned integer
\o typedef quint16
\row
\o INT
\o 32-bit signed integer
\o typedef qint32
\row
\o INT UNSIGNED
\o 32-bit unsigned integer
\o typedef quint32
\row
\o BIGINT
\o 64-bit signed integer
\o typedef qint64
\row
\o FLOAT
\o 32-bit Floating Point
\o By default mapping to QString
\row
\o DOUBLE
\o 64-bit Floating Point
\o By default mapping to QString
\row
\o CHAR
\o Character string
\o Mapped to QString
\row
\o VARCHAR
\o Character string
\o Mapped to QString
\row
\o TINYTEXT
\o Character string
\o Mapped to QString
\row
\o TEXT
\o Character string
\o Mapped to QString
\row
\o MEDIUMTEXT
\o Character string
\o Mapped to QString
\row
\o LONGTEXT
\o Character string
\o Mapped to QString
\row
\o CLOB
\o Character large string object
\o Mapped to QString
\row
\o all BLOB types
\o BLOB
\o Mapped to QByteArray
\row
\o DATE
\o Date without Time
\o Mapped to QDate
\row
\o DATETIME
\o Date and Time
\o Mapped to QDateTime
\row
\o TIMESTAMP
\o Date and Time
\o Mapped to QDateTime
\row
\o TIME
\o Time
\o Mapped to QTime
\row
\o YEAR
\o Year (int)
\o Mapped to QDateTime
\row
\o ENUM
\o Enumeration of Value Set
\o Mapped to QString
\endtable
\section2 Oracle Call Interface Data Types
\table 90%
\header
\o Oracle Call Interface data type
\o SQL type description
\o Recommended input (C++ or Qt data type)
\row
\o NUMBER
\o FLOAT, DOUBLE, PRECISIONc REAL
\o By default mapping to QString
\row
\o NUMBER(38)
\o INTEGER INT SMALLINT
\o typedef qint8/16/32/64
\row
\o NUMBER(p,s)
\o NUMERIC(p,s) DECIMAL(p,s)a
\o By default mapping to QString
\row
\o NVARCHAR2(n)
\o Character string (NATIONAL CHARACTER VARYING(n) NATIONAL
CHAR VARYING(n) NCHAR VARYING(n))
\o Mapped to QString
\row
\o NCHAR(n)
\o Character string (NATIONAL CHARACTER(n) NATIONAL CHAR(n)
NCHAR(n))
\o Mapped to QString
\row
\o CHAR(n)
\o Character string (CHARACTER(n) CHAR(n))
\o Mapped to QString
\row
\o CLOB
\o Character large string object
\o Mapped to QString
\row
\o BLOB
\o A binary large object
\o Mapped to QByteArray
\row
\o TIMESTAMP
\o Year, month, and day values of date, as well as hour, minute,
and second values of time
\o Mapped to QDateTime
\endtable
\section2 ODBC Data Types
\table 90%
\header
\o ODBC data type
\o SQL type description
\o Recommended input (C++ or Qt data type)
\row
\o BIT
\o Boolean
\o BOOL
\row
\o TINYINT
\o 8 bit integer
\o typedef qint8
\row
\o SMALLINT
\o 16-bit signed integer
\o typedef qint16
\row
\o INTEGER
\o 32-bit signed integer
\o typedef qint32
\row
\o BIGINT
\o 64-bit signed integer
\o typedef qint64
\row
\o REAL
\o 32-bit Single-precision floating point
\o By default mapping to QString
\row
\o FLOAT
\o 64-bit Double floating point
\o By default mapping to QString
\row
\o DOUBLE
\o 64-bit Double floating point
\o By default mapping to QString
\row
\o CHAR
\o Character string
\o Mapped to QString
\row
\o VARCHAR
\o Character string
\o Mapped to QString
\row
\o LONGVARCHAR
\o Character string
\o Mapped to QString
\row
\o CLOB
\o Character large string object
\o Mapped to QString
\row
\o DATE
\o Character string
\o Mapped to QDate
\row
\o TIME
\o Character Time, Character string
\o Mapped to QTime
\row
\o TIMESTAMP
\o Character Time, Character string
\o Mapped to QDateTime
\endtable
\section2 PostgreSQL Data Types
\table 90%
\header
\o PostgreSQL data type
\o SQL type description
\o Recommended input (C++ or Qt data type)
\row
\o BOOLEAN
\o Boolean
\o bool
\row
\o SMALLINT
\o 16-bit signed integer
\o typedef qint16
\row
\o INTEGER
\o 32-bit signed integer
\o typedef qint32
\row
\o BIGINT
\o 64-bit signed integer
\o typedef qint64
\row
\o REAL
\o 32-bit variable-precision floating point
\o By default mapping to QString
\row
\o DOUBLE PRECISION
\o 64-bit variable-precision floating point
\o By default mapping to QString
\row
\o DECIMAL VARIABLE
\o user-specified precision, exact
\o Mapped to QString
\row
\o NUMERIC VARIABLE
\o user-specified precision, exact
\o Mapped to QString
\row
\o VARCHAR
\o variable-length character string
\o Mapped to QString
\row
\o CHARACTER
\o Character string of fixed-length
\o Mapped to QString
\row
\o TEXT
\o Character string of variable-length
\o Mapped to QString
\row
\o CLOB
\o Character large string object
\o Mapped to QString
\row
\o TIMESTAMP
\o 8 bytes, both date and time
\o Mapped to QDateTime
\row
\o TIMESTAMP
\o 8 bytes, both date and time, with time zone
\o Mapped to QDateTime
\row
\o DATE
\o 4 bytes, dates only
\o Mapped to QDate
\row
\o TIME
\o 8 bytes, times of day only 00:00:00.00 - 23:59:59.99
\o Mapped to QTime
\row
\o TIME
\o 12 bytes times of day only, with time zone 00:00:00.00+12
\o Mapped to QDateTime
\endtable
\section2 QSQLITE SQLite version 3 Data Types
\table 90%
\header
\o QSQLITE SQLite version 3 data type
\o SQL type description
\o Recommended input (C++ or Qt data type)
\row
\o NULL
\o NULL value.
\o NULL
\row
\o INTEGER
\o Signed integer, stored in 8, 16, 24, 32, 48, or 64-bits
depending on the magnitude of the value.
\o typedef qint8/16/32/64
\row
\o REAL
\o 64-bit floating point value.
\o By default mapping to QString
\row
\o TEXT
\o Character string (UTF-8, UTF-16BE or UTF-16-LE).
\o Mapped to QString
\row
\o CLOB
\o Character large string object
\o Mapped to QString
\row
\o BLOB
\o The value is a BLOB of data, stored exactly as it was input.
\o Mapped to QByteArray
\endtable
\section2 Sybase Adaptive Server Data Types
\table 90%
\header
\o Sybase Adaptive Server data type
\o SQL type description
\o Recommended input (C++ or Qt data type)
\row
\o BINARY
\o Describes a fixed-length binary value up to 255 bytes in size.
\o Mapped to QByteArray
\row
\o CHAR
\o Character String
\o Mapped to QString
\row
\o DATETIME
\o Date and time. Range: 1753-01-01 00:00:00 through 9999-12-31 23:59:59.
\o Mapped to QDateTime
\row
\o NCHAR
\o Character String of fixed length
\o Mapped to QString
\row
\o NVARACHAR
\o Character String of variable length
\o Mapped to QString
\row
\o VARCHAR
\o Character String of fixed length
\o Mapped to QString
\row
\o CLOB
\o Character large string object
\o Mapped to QString
\row
\o TIMESTAMP
\o A unique number within a database
\o Mapped to QString
\row
\o SMALLDATETIME
\o Date and time. Range: 1900-01-01 00:00 through 2079-12-31 23:59
\o Mapped to QDateTime
\row
\o UNICHAR
\o Character String of fixed length.(Unicode)
\o Mapped to QString
\row
\o UNIVARCHAR
\o Character String of variable length.(Unicode)
\o Mapped to QString
\row
\o VARBINARY
\o Describes a variable-length binary value up to 255 bytes in size
\o Mapped to QByteArray
\endtable
\section2 SQLite Version 2
SQLite version 2 is "typeless". This means that you can store any kind of
data you want in any column of any table, regardless of the declared
data type of that column. We recommend that you map the data to QString.
*/
|
