src/sql/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     char fName[IDENTIFIER_LENGTH];
  57 };
  58
  59 struct FieldName
  60 {
  61     char fldName[IDENTIFIER_LENGTH];
  62     AggType aType; //used only in case of select projection
  63     FieldName()
  64     {
  65         strcpy(fldName,"");
  66         aType = AGG_UNKNOWN;
  67     }
  68 };
  69
  70 struct UpdateFieldValue
  71 {
  72     char fldName[IDENTIFIER_LENGTH];
  73     char *parsedString;
  74     void *value;
  75     DataType type;
  76     int length;
  77     int paramNo;
  78 };
  79
  80
  81 class ParsedData
  82 {
  83     private:
  84     char tblName[IDENTIFIER_LENGTH];
  85     char idxName[IDENTIFIER_LENGTH];
  86
  87     StatementType stmtType;
  88
  89     int paramCounter;
  90
  91     //holds pointer to field names. used in insert to store field name list
  92     //and for projection list of select
  93     //also used to store primary or unique key fields in create statement
  94     List fieldNameList;
  95
  96     List groupFieldNameList;
  97
  98     //holds pointer to condition values.
  99     List conditionValueList;
 100
 101     //holds pointer to field values. used in insert to store field values
 102     //used in update to store the current value returned by fetch().This gets replaced
 103     //by value in updFldValList and then update() is called.
 104     List fieldValueList;
 105
 106     //used to store IN values of SELECT statement
 107     //This should be a list of list. so that multiple IN shall be present
 108     //in the select statement
 109     List inValueList;
 110
 111     //update field value list. used to store the values to be updated
 112     //value in the SET clause of UPDATE statement is stored here.
 113     List updFldValList;
 114
 115     //stores the where clause condition for SELECT, UPDATE and DELETE
 116     Condition predicate;
 117
 118     //stores field information in CREATE TABLE
 119     FieldDef fldDef;
 120
 121     //stores list of fields for CREATE TABLE
 122     FieldList creFldList;
 123
 124     //stores index information
 125     bool isUnique;
 126     bool isPrimary;
 127     IndexType indexType;
 128
 129     public:
 130     ParsedData() { paramCounter = 0; stmtType = UnknownStatement;
 131                  isUnique = false; isPrimary = false; indexType = hashIndex;}
 132     void setStmtType(StatementType type) { stmtType = type; }
 133     void setTableName(char *name) { strcpy(tblName, name); }
 134     void setIndexName(char *name) { strcpy(idxName, name); }
 135
 136     char* getTableName() { return tblName; }
 137     char* getIndexName() { return idxName; }
 138
 139     void insertValue(char *value);
 140     void insertInValue(char *value);
 141     void** insertCondValueAndGetPtr(char *fName, char *value);
 142     void insertUpdateValue(char *fldName, char *value);
 143
 144     void insertField(char *fName, AggType aggType= AGG_UNKNOWN);
 145     void insertGroupField(char *fName);
 146     void clearFieldNameList();
 147
 148
 149     Predicate* insertPredicate(char *fldName, ComparisionOp op, void** value);
 150     Predicate* insertPredicate(char *fldName, ComparisionOp op, char *fldName);
 151     Predicate* insertPredicate(Predicate *p1, LogicalOp op, Predicate *p2 = NULL);
 152     void setCondition(Predicate *pred)
 153     {
 154         //No body is deleting memory allocated during condition::setTerm for PredicateImpl
 155         //have list in this pared data and delete it during reset
 156         predicate.setPredicate(pred);
 157     }
 158     Condition* getCondition() { return &predicate; }
 159
 160     void insertFieldValue(FieldValue *newVal) { fieldValueList.append(newVal); }
 161
 162     List getFieldNameList() { return fieldNameList; }
 163     List getGroupFieldNameList() { return groupFieldNameList; }
 164     List getConditionValueList() { return conditionValueList; }
 165     List getFieldValueList() { return fieldValueList; }
 166     List getInValueList() { return inValueList; }
 167     List getUpdateFieldValueList() { return updFldValList; }
 168
 169     void setFldName(char *name);
 170     void setFldType(DataType type);
 171     void setFldLength(size_t length);
 172     void setDefaultValue(char * value);
 173     //void setFldDefaultValue -- will need two parametersers, check how u want to pass default value.
 174     void setFldNotNull(bool notNull);
 175
 176     void setUnique(bool unique){ isUnique = unique; }
 177     void setPrimary(bool primary) { isPrimary = primary; }
 178     void setIndexType (IndexType type) { indexType = type; }
 179     IndexType getIndexType(){ return indexType; }
 180     bool getUnique() { return isUnique; }
 181     bool getPrimary() { return isPrimary; }
 182
 183     void insertFldDef(); //check if fldDef needs to be a part of ParsedData
 184
 185     FieldList getCreFldList() { return creFldList; }
 186
 187     StatementType getStmtType() { return stmtType; }
 188
 189     void reset();
 190
 191 };
 192
 193 #endif
 194
 195 //TODO: Aruna
 196 //variable and function names suck, change if u want to
 197 //setFldDefaultValue
 198 //finding out if fldDef needs to be part of parsedData, or can allocate memory and pass around
 199 //primary key
 200 //foreign key