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diff --git a/doc/src/sql-programming/qsqldatatype-table.qdoc b/doc/src/sql-programming/qsqldatatype-table.qdoc new file mode 100644 index 0000000000..e8c2351c11 --- /dev/null +++ b/doc/src/sql-programming/qsqldatatype-table.qdoc @@ -0,0 +1,583 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at http://qt.nokia.com/contact. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/*! + \page sql-types.html + \title Recommended Use of Data Types in Databases + + \ingroup best-practices + + \section1 Recommended Use of Types in Qt Supported Databases + + This table shows the recommended data types used when extracting data + from the databases supported in Qt. It is important to note that the + types used in Qt are not necessarily valid as input to the specific + database. One example could be that a double would work perfectly as + input for floating point records in a database, but not necessarily + as a storage format for output from the database since 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. +*/ |