include/Parser.h

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Prabakaran Thirumalai   *
   3  *   praba_tuty@yahoo.com   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifndef PARSER_H
  21 #define PARSER_H
  22 #include <CSql.h>
  23 #include <AggTableImpl.h>
  24 #include <os.h>
  25 #include <Util.h>
  26 enum StatementType
  27 {
  28     UnknownStatement,
  29     SelectStatement,
  30     InsertStatement,
  31     UpdateStatement,
  32     DeleteStatement,
  33     CreateTableStatement,
  34     DropTableStatement,
  35     CreateIndexStatement,
  36     DropIndexStatement
  37 };
  38
  39 struct FieldValue
  40 {
  41     char *parsedString;
  42     void *value;
  43     int paramNo; // 0 ->not a param. It stores the param position
  44     DataType type;
  45     int length;
  46 };
  47
  48
  49 struct ConditionValue
  50 {
  51     char *parsedString;
  52     void *value;
  53     int paramNo; // 0 ->not a param. It stores the param position
  54     DataType type;
  55     int length;
  56         bool opLike;
  57     char fName[IDENTIFIER_LENGTH];
  58 };
  59
  60 struct FieldName
  61 {
  62     char fldName[IDENTIFIER_LENGTH];
  63     AggType aType; //used only in case of select projection
  64     FieldName()
  65     {
  66         strcpy(fldName,"");
  67         aType = AGG_UNKNOWN;
  68     }
  69 };
  70
  71 struct UpdateFieldValue
  72 {
  73     char fldName[IDENTIFIER_LENGTH];
  74     char *parsedString;
  75     void *value;
  76     DataType type;
  77     int length;
  78     int paramNo;
  79 };
  80
  81
  82 class ParsedData
  83 {
  84     private:
  85     char tblName[IDENTIFIER_LENGTH];
  86     char idxName[IDENTIFIER_LENGTH];
  87
  88     StatementType stmtType;
  89
  90     int paramCounter;
  91
  92     //holds pointer to field names. used in insert to store field name list
  93     //and for projection list of select
  94     //also used to store primary or unique key fields in create statement
  95     List fieldNameList;
  96
  97     List groupFieldNameList;
  98
  99     //holds pointer to condition values.
 100     List conditionValueList;
 101
 102     //holds pointer to field values. used in insert to store field values
 103     //used in update to store the current value returned by fetch().This gets replaced
 104     //by value in updFldValList and then update() is called.
 105     List fieldValueList;
 106
 107     //used to store IN values of SELECT statement
 108     //This should be a list of list. so that multiple IN shall be present
 109     //in the select statement
 110     List inValueList;
 111
 112     //update field value list. used to store the values to be updated
 113     //value in the SET clause of UPDATE statement is stored here.
 114     List updFldValList;
 115
 116     //stores the where clause condition for SELECT, UPDATE and DELETE
 117     Condition predicate;
 118
 119     //stores field information in CREATE TABLE
 120     FieldDef fldDef;
 121
 122     //stores list of fields for CREATE TABLE
 123     FieldList creFldList;
 124
 125     //stores index information
 126     bool isUnique;
 127     bool isPrimary;
 128     IndexType indexType;
 129
 130     public:
 131     ParsedData() { paramCounter = 0; stmtType = UnknownStatement;
 132                  isUnique = false; isPrimary = false; indexType = hashIndex;}
 133     void setStmtType(StatementType type) { stmtType = type; }
 134     void setTableName(char *name) { strcpy(tblName, name); }
 135     void setIndexName(char *name) { strcpy(idxName, name); }
 136
 137     char* getTableName() { return tblName; }
 138     char* getIndexName() { return idxName; }
 139
 140     void insertValue(char *value);
 141     void insertInValue(char *value);
 142         // third parameter is to avoid conflict between '?' between like operand and parameterized value in sql statement.
 143         // eg: select * from t1 where f1 = ? and f2 like '_ti%';
 144         // _ is converted to ? before it is processed
 145     void** insertCondValueAndGetPtr(char *fName, char *value, bool opLike=false);
 146     void insertUpdateValue(char *fldName, char *value);
 147
 148     void insertField(char *fName, AggType aggType= AGG_UNKNOWN);
 149     void insertGroupField(char *fName);
 150     void clearFieldNameList();
 151
 152
 153     Predicate* insertPredicate(char *fldName, ComparisionOp op, void** value);
 154     Predicate* insertPredicate(char *fldName, ComparisionOp op, char *fldName);
 155     Predicate* insertPredicate(Predicate *p1, LogicalOp op, Predicate *p2 = NULL);
 156     void setCondition(Predicate *pred)
 157     {
 158         //No body is deleting memory allocated during condition::setTerm for PredicateImpl
 159         //have list in this pared data and delete it during reset
 160         predicate.setPredicate(pred);
 161     }
 162     Condition* getCondition() { return &predicate; }
 163
 164     void insertFieldValue(FieldValue *newVal) { fieldValueList.append(newVal); }
 165
 166     List getFieldNameList() { return fieldNameList; }
 167     List getGroupFieldNameList() { return groupFieldNameList; }
 168     List getConditionValueList() { return conditionValueList; }
 169     List getFieldValueList() { return fieldValueList; }
 170     List getInValueList() { return inValueList; }
 171     List getUpdateFieldValueList() { return updFldValList; }
 172
 173     void setFldName(char *name);
 174     void setFldType(DataType type);
 175     void setFldLength(size_t length);
 176     void setDefaultValue(char * value);
 177     //void setFldDefaultValue -- will need two parametersers, check how u want to pass default value.
 178     void setFldNotNull(bool notNull);
 179
 180     void setUnique(bool unique){ isUnique = unique; }
 181     void setPrimary(bool primary) { isPrimary = primary; }
 182     void setIndexType (IndexType type) { indexType = type; }
 183     IndexType getIndexType(){ return indexType; }
 184     bool getUnique() { return isUnique; }
 185     bool getPrimary() { return isPrimary; }
 186
 187     void insertFldDef(); //check if fldDef needs to be a part of ParsedData
 188
 189     FieldList getCreFldList() { return creFldList; }
 190
 191     StatementType getStmtType() { return stmtType; }
 192
 193     void reset();
 194
 195 };
 196
 197 #endif
 198
 199 //TODO: Aruna
 200 //variable and function names suck, change if u want to
 201 //setFldDefaultValue
 202 //finding out if fldDef needs to be part of parsedData, or can allocate memory and pass around
 203 //primary key
 204 //foreign key