QGIS API Documentation  3.25.0-Master (6b426f5f8a)
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 #define SIP_NO_FILE
20 
22 
23 #include "qgis_core.h"
25 
37 class CORE_EXPORT QgsSQLiteExpressionCompiler : public QgsSqlExpressionCompiler
38 {
39  public:
40 
48  explicit QgsSQLiteExpressionCompiler( const QgsFields &fields, bool ignoreStaticNodes = false );
49 
50  protected:
51 
52  Result compileNode( const QgsExpressionNode *node, QString &str ) override;
53  QString quotedIdentifier( const QString &identifier ) override;
54  QString quotedValue( const QVariant &value, bool &ok ) override;
55  QString sqlFunctionFromFunctionName( const QString &fnName ) const override;
56  QStringList sqlArgumentsFromFunctionName( const QString &fnName, const QStringList &fnArgs ) const override;
57  QString castToReal( const QString &value ) const override;
58  QString castToInt( const QString &value ) const override;
59  QString castToText( const QString &value ) const override;
60 
61 };
62 
64 
65 #endif // QGSSQLITEEXPRESSIONCOMPILER_H
Abstract base class for all nodes that can appear in an expression.
Container of fields for a vector layer.
Definition: qgsfields.h:45
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.
#define str(x)
Definition: qgis.cpp:37