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 <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 isNullable;
  49     bool isAllocVal;
  50 };
  51
  52
  53 struct ConditionValue
  54 {
  55     char *parsedString;
  56     void *value;
  57     int paramNo; // 0 ->not a param. It stores the param position
  58     DataType type;
  59     int length;
  60     bool opLike;
  61     bool isNullable;
  62     char fName[IDENTIFIER_LENGTH];
  63 };
  64
  65 struct FieldName
  66 {
  67     char fldName[IDENTIFIER_LENGTH];
  68     AggType aType; //used only in case of select projection
  69     FieldName()
  70     {
  71         strcpy(fldName,"");
  72         aType = AGG_UNKNOWN;
  73     }
  74 };
  75 struct TableName
  76 {
  77     char tblName[IDENTIFIER_LENGTH];
  78     TableName()
  79     {
  80         strcpy(tblName,"");
  81     }
  82 };
  83
  84 struct UpdateFieldValue
  85 {
  86     char fldName[IDENTIFIER_LENGTH];
  87     char *parsedString;
  88     void *value;
  89     Expression *expre;
  90     DataType type;
  91     int length;
  92     bool isNullable;
  93     int paramNo;
  94 };
  95
  96
  97 class ParsedData
  98 {
  99     private:
 100     char tblName[IDENTIFIER_LENGTH];
 101     char idxName[IDENTIFIER_LENGTH];
 102
 103     StatementType stmtType;
 104
 105     int paramCounter;
 106
 107     List tableNameList;
 108     //holds pointer to field names. used in insert to store field name list
 109     //and for projection list of select
 110     //also used to store primary or unique key fields in create statement
 111     List fieldNameList;
 112
 113     List groupFieldNameList;
 114
 115     //holds pointer to condition values.
 116     List conditionValueList;
 117
 118     //holds pointer to field values. used in insert to store field values
 119     //used in update to store the current value returned by fetch().This gets replaced
 120     //by value in updFldValList and then update() is called.
 121     List fieldValueList;
 122
 123     //used to store IN values of SELECT statement
 124     //This should be a list of list. so that multiple IN shall be present
 125     //in the select statement
 126     List inValueList;
 127
 128     //update field value list. used to store the values to be updated
 129     //value in the SET clause of UPDATE statement is stored here.
 130     List updFldValList;
 131
 132     //stores the where clause condition for SELECT, UPDATE and DELETE
 133     Condition predicate;
 134
 135     //stores field information in CREATE TABLE
 136     FieldDef fldDef;
 137
 138     //stores list of fields for CREATE TABLE
 139     FieldList creFldList;
 140
 141     //stores index information
 142     bool isUnique;
 143     bool isPrimary;
 144     IndexType indexType;
 145
 146     public:
 147     ParsedData() { paramCounter = 0; stmtType = UnknownStatement;
 148                  isUnique = false; isPrimary = false; indexType = hashIndex;}
 149     void setStmtType(StatementType type) { stmtType = type; }
 150     void setTableName(char *name) { strcpy(tblName, name); }
 151     void setIndexName(char *name) { strcpy(idxName, name); }
 152
 153     char* getTableName() { return tblName; }
 154     char* getIndexName() { return idxName; }
 155
 156     void insertValue(char *value);
 157     void insertInValue(char *value);
 158         // third parameter is to avoid conflict between '?' between like operand and parameterized value in sql statement.
 159         // eg: select * from t1 where f1 = ? and f2 like '_ti%';
 160         // _ is converted to ? before it is processed
 161     void** insertCondValueAndGetPtr(char *fName, char *value, bool opLike=false);
 162     void insertUpdateValue(char *fldName, char *value);
 163
 164     void insertField(char *fName, AggType aggType= AGG_UNKNOWN);
 165     void insertGroupField(char *fName);
 166     void clearFieldNameList();
 167     void insertTableName(char *value);
 168
 169
 170     Predicate* insertPredicate(char *fldName, ComparisionOp op, void** value);
 171     Predicate* insertPredicate(char *fldName, ComparisionOp op, char *fldName);
 172     Predicate* insertBetPredicate(char *fldName, ComparisionOp op1, void **value1, ComparisionOp op2, void **value2);
 173     Predicate* insertPredicate(Predicate *p1, LogicalOp op, Predicate *p2 = NULL);
 174     void setCondition(Predicate *pred)
 175     {
 176         //No body is deleting memory allocated during condition::setTerm for PredicateImpl
 177         //have list in this pared data and delete it during reset
 178         predicate.setPredicate(pred);
 179     }
 180     Condition* getCondition() { return &predicate; }
 181
 182     void insertFieldValue(FieldValue *newVal) { fieldValueList.append(newVal); }
 183
 184     List getFieldNameList() { return fieldNameList; }
 185     List getGroupFieldNameList() { return groupFieldNameList; }
 186     List getConditionValueList() { return conditionValueList; }
 187     List getFieldValueList() { return fieldValueList; }
 188     List getInValueList() { return inValueList; }
 189     List getUpdateFieldValueList() { return updFldValList; }
 190     List getTableNameList() { return tableNameList; }
 191
 192     void setFldName(char *name);
 193     void setFldType(DataType type);
 194     DbRetVal setFldLength(size_t length);
 195     void setDefaultValue(char * value);
 196     //void setFldDefaultValue -- will need two parametersers, check how u want to pass default value.
 197     void setFldNotNull(bool notNull);
 198
 199     void setUnique(bool unique){ isUnique = unique; }
 200     void setPrimary(bool primary) { isPrimary = primary; }
 201     void setIndexType (IndexType type) { indexType = type; }
 202     IndexType getIndexType(){ return indexType; }
 203     bool getUnique() { return isUnique; }
 204     bool getPrimary() { return isPrimary; }
 205     Expression* insertExpression(char *fldName);
 206     Expression* insertExpression(char *value, bool flag);
 207     Expression* insertExpression(Expression* exp1, ArithOperator op ,Expression* exp1);
 208     void insertUpdateExpression(char *fName, Expression *exp);
 209
 210     void insertFldDef(); //check if fldDef needs to be a part of ParsedData
 211
 212     FieldList getCreFldList() { return creFldList; }
 213
 214     StatementType getStmtType() { return stmtType; }
 215
 216     void reset();
 217
 218 };
 219
 220 #endif
 221
 222 //TODO: Aruna
 223 //variable and function names suck, change if u want to
 224 //setFldDefaultValue
 225 //finding out if fldDef needs to be part of parsedData, or can allocate memory and pass around
 226 //primary key
 227 //foreign key