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 <JoinTableImpl.h>
  25 #include <os.h>
  26 #include <Util.h>
  27 enum StatementType
  28 {
  29     UnknownStatement,
  30     SelectStatement,
  31     InsertStatement,
  32     UpdateStatement,
  33     DeleteStatement,
  34     CreateTableStatement,
  35     DropTableStatement,
  36     CreateIndexStatement,
  37     DropIndexStatement
  38 };
  39
  40 struct FieldValue
  41 {
  42     char fldName[IDENTIFIER_LENGTH];
  43     char *parsedString;
  44     void *value;
  45     int paramNo; // 0 ->not a param. It stores the param position
  46     DataType type;
  47     int length;
  48     bool isAllocVal;
  49 };
  50
  51
  52 struct ConditionValue
  53 {
  54     char *parsedString;
  55     void *value;
  56     int paramNo; // 0 ->not a param. It stores the param position
  57     DataType type;
  58     int length;
  59     bool opLike;
  60     char fName[IDENTIFIER_LENGTH];
  61 };
  62
  63 struct FieldName
  64 {
  65     char fldName[IDENTIFIER_LENGTH];
  66     AggType aType; //used only in case of select projection
  67     FieldName()
  68     {
  69         strcpy(fldName,"");
  70         aType = AGG_UNKNOWN;
  71     }
  72 };
  73 struct TableName
  74 {
  75     char tblName[IDENTIFIER_LENGTH];
  76     TableName()
  77     {
  78         strcpy(tblName,"");
  79     }
  80 };
  81
  82 struct UpdateFieldValue
  83 {
  84     char fldName[IDENTIFIER_LENGTH];
  85     char *parsedString;
  86     void *value;
  87     DataType type;
  88     int length;
  89     int paramNo;
  90 };
  91
  92
  93 class ParsedData
  94 {
  95     private:
  96     char tblName[IDENTIFIER_LENGTH];
  97     char idxName[IDENTIFIER_LENGTH];
  98
  99     StatementType stmtType;
 100
 101     int paramCounter;
 102
 103     List tableNameList;
 104     //holds pointer to field names. used in insert to store field name list
 105     //and for projection list of select
 106     //also used to store primary or unique key fields in create statement
 107     List fieldNameList;
 108
 109     List groupFieldNameList;
 110
 111     //holds pointer to condition values.
 112     List conditionValueList;
 113
 114     //holds pointer to field values. used in insert to store field values
 115     //used in update to store the current value returned by fetch().This gets replaced
 116     //by value in updFldValList and then update() is called.
 117     List fieldValueList;
 118
 119     //used to store IN values of SELECT statement
 120     //This should be a list of list. so that multiple IN shall be present
 121     //in the select statement
 122     List inValueList;
 123
 124     //update field value list. used to store the values to be updated
 125     //value in the SET clause of UPDATE statement is stored here.
 126     List updFldValList;
 127
 128     //stores the where clause condition for SELECT, UPDATE and DELETE
 129     Condition predicate;
 130
 131     //stores field information in CREATE TABLE
 132     FieldDef fldDef;
 133
 134     //stores list of fields for CREATE TABLE
 135     FieldList creFldList;
 136
 137     //stores index information
 138     bool isUnique;
 139     bool isPrimary;
 140     IndexType indexType;
 141
 142     public:
 143     ParsedData() { paramCounter = 0; stmtType = UnknownStatement;
 144                  isUnique = false; isPrimary = false; indexType = hashIndex;}
 145     void setStmtType(StatementType type) { stmtType = type; }
 146     void setTableName(char *name) { strcpy(tblName, name); }
 147     void setIndexName(char *name) { strcpy(idxName, name); }
 148
 149     char* getTableName() { return tblName; }
 150     char* getIndexName() { return idxName; }
 151
 152     void insertValue(char *value);
 153     void insertInValue(char *value);
 154         // third parameter is to avoid conflict between '?' between like operand and parameterized value in sql statement.
 155         // eg: select * from t1 where f1 = ? and f2 like '_ti%';
 156         // _ is converted to ? before it is processed
 157     void** insertCondValueAndGetPtr(char *fName, char *value, bool opLike=false);
 158     void insertUpdateValue(char *fldName, char *value);
 159
 160     void insertField(char *fName, AggType aggType= AGG_UNKNOWN);
 161     void insertGroupField(char *fName);
 162     void clearFieldNameList();
 163     void insertTableName(char *value);
 164
 165
 166     Predicate* insertPredicate(char *fldName, ComparisionOp op, void** value);
 167     Predicate* insertPredicate(char *fldName, ComparisionOp op, char *fldName);
 168     Predicate* insertPredicate(Predicate *p1, LogicalOp op, Predicate *p2 = NULL);
 169     void setCondition(Predicate *pred)
 170     {
 171         //No body is deleting memory allocated during condition::setTerm for PredicateImpl
 172         //have list in this pared data and delete it during reset
 173         predicate.setPredicate(pred);
 174     }
 175     Condition* getCondition() { return &predicate; }
 176
 177     void insertFieldValue(FieldValue *newVal) { fieldValueList.append(newVal); }
 178
 179     List getFieldNameList() { return fieldNameList; }
 180     List getGroupFieldNameList() { return groupFieldNameList; }
 181     List getConditionValueList() { return conditionValueList; }
 182     List getFieldValueList() { return fieldValueList; }
 183     List getInValueList() { return inValueList; }
 184     List getUpdateFieldValueList() { return updFldValList; }
 185     List getTableNameList() { return tableNameList; }
 186
 187     void setFldName(char *name);
 188     void setFldType(DataType type);
 189     void setFldLength(size_t length);
 190     void setDefaultValue(char * value);
 191     //void setFldDefaultValue -- will need two parametersers, check how u want to pass default value.
 192     void setFldNotNull(bool notNull);
 193
 194     void setUnique(bool unique){ isUnique = unique; }
 195     void setPrimary(bool primary) { isPrimary = primary; }
 196     void setIndexType (IndexType type) { indexType = type; }
 197     IndexType getIndexType(){ return indexType; }
 198     bool getUnique() { return isUnique; }
 199     bool getPrimary() { return isPrimary; }
 200
 201     void insertFldDef(); //check if fldDef needs to be a part of ParsedData
 202
 203     FieldList getCreFldList() { return creFldList; }
 204
 205     StatementType getStmtType() { return stmtType; }
 206
 207     void reset();
 208
 209 };
 210
 211 #endif
 212
 213 //TODO: Aruna
 214 //variable and function names suck, change if u want to
 215 //setFldDefaultValue
 216 //finding out if fldDef needs to be part of parsedData, or can allocate memory and pass around
 217 //primary key
 218 //foreign key