QGIS API Documentation 4.0.0-Norrköping (1ddcee3d0e4)
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qgssqliteexpressioncompiler.h
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1/***************************************************************************
2 qgssqliteexpressioncompiler.h
3 ---------------------------------
4 begin : November 2015
5 copyright : (C) 2015 Nyall Dawson
6 email : nyall dot dawson at gmail dot com
7 ***************************************************************************
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License as published by *
11 * the Free Software Foundation; either version 2 of the License, or *
12 * (at your option) any later version. *
13 * *
14 ***************************************************************************/
15
16#ifndef QGSSQLITEEXPRESSIONCOMPILER_H
17#define QGSSQLITEEXPRESSIONCOMPILER_H
18
19
21
22#include "qgis_core.h"
24
25#define SIP_NO_FILE
26
36
37class CORE_EXPORT QgsSQLiteExpressionCompiler : public QgsSqlExpressionCompiler
38{
39 public:
47 explicit QgsSQLiteExpressionCompiler( const QgsFields &fields, bool ignoreStaticNodes = false );
48
49 protected:
50 Result compileNode( const QgsExpressionNode *node, QString &str ) override;
51 QString quotedIdentifier( const QString &identifier ) override;
52 QString quotedValue( const QVariant &value, bool &ok ) override;
53 QString sqlFunctionFromFunctionName( const QString &fnName ) const override;
54 QStringList sqlArgumentsFromFunctionName( const QString &fnName, const QStringList &fnArgs ) const override;
55 QString castToReal( const QString &value ) const override;
56 QString castToInt( const QString &value ) const override;
57 QString castToText( const QString &value ) const override;
58};
59
61
62#endif // QGSSQLITEEXPRESSIONCOMPILER_H
Generic expression compiler for translation to provider specific SQL WHERE clauses.
virtual Result compileNode(const QgsExpressionNode *node, QString &str)
Compiles an expression node and returns the result of the compilation.
virtual QStringList sqlArgumentsFromFunctionName(const QString &fnName, const QStringList &fnArgs) const
Returns the Arguments for SQL function for the expression function.
virtual QString quotedValue(const QVariant &value, bool &ok)
Returns a quoted attribute value, in the format expected by the provider.
virtual QString castToText(const QString &value) const
Casts a value to a text result.
virtual QString castToInt(const QString &value) const
Casts a value to a integer result.
virtual QString quotedIdentifier(const QString &identifier)
Returns a quoted column identifier, in the format expected by the provider.
virtual QString sqlFunctionFromFunctionName(const QString &fnName) const
Returns the SQL function for the expression function.
virtual QString castToReal(const QString &value) const
Casts a value to a real result.