About SQLite
This is a simple SQLite wrapper written in c++. SQLite is an embedded SQL database engine,fully tested. SQLite does not have a separate server process. SQLite reads and writes directly to ordinary disk files.
The description about SQLite database is
HERE.
SQLite release for Windows OS can be download from
HERE.
SQLite Wrapper
This source code provide the simple methods to create database and run queries in portable database. Created SQLite database file is platform independent and can be use or replicate to Windows or Linux OS.
SQLiteDB Class
This class contains the method of SQLite wrapper.
Method to open connection accept two argument first one is the database file name this could be *.db format and the directory where the DB file will create. If DB file is already present it will be open or else new file will create.
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class SQLiteDB : public IResult
{
public:
SQLiteDB();
~SQLiteDB();
/*Open Connection*/
bool OpenConnection(string DatabaseName,string DatabaseDir);
/*Close Connection*/
void CloseConnection();
/*Query Wrapper*/
/*For large insert operation Memory Insert option for SQLLITE dbJournal*/
void BeginTransaction();
void CommitTransection();
/*This Method called when SELECT Query to be excuted.
Return RESULTSET class pointer on success else NULL of failed*/
IResult* ExcuteSelect(const char *Query);
/*This Method called when INSERT/DELETE/UPDATE Query to be excuted.
Return UINT count of effected data on success*/
UINT Excute(const char *Query);
/*Get Last Error of excution*/
string GetLastError();
/*Return TRUE if databse is connected else FALSE*/
bool isConnected() ;
protected:
/*SQLite Connection Object*/
typedef struct SQLLITEConnection
{
string SQLiteDatabaseName; //Database Name
string SQLiteDBPath; //Databse File Dir
sqlite3 *pCon; //SQLite Connection Object
sqlite3_stmt *pRes; //SQLite statement object
}SQLITECONNECTIONOBJECT;
//SQLite Connection Details
SQLITECONNECTIONOBJECT *pSQLiteConn;
/*Sync Database in Case of Multiple Threads using class object*/
SyncDB *Sync;
bool m_bConnected; /*Is Connected To DB*/
bool m_bConsole; /*If Console Application*/
string m_strLastError; /*Last Error String*/
int m_iColumnCount; /*No.Of Column in Result*/
private:
/*This function return of count of column
present in result set of last excueted query*/
int GetColumnCount();
/*Get the next coloumn name*/
const char* NextColomnName(int iClmnCount);
/*This function returns TRUE if still rows are
der in result set of last excueted query FALSE
if no row present*/
bool Next();
/*Get the next coloumn data*/
const char* ColomnData(int clmNum);
/*RELEASE all result set as well as RESET all data*/
void Release();
};
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Where the select query can be excuted from the method
IResult* ExcuteSelect(const char *Query); Which return the object of Interface class IResult.
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/*Interface class for Result data of query*/
class IResult
{
public:
/*This function return of count of column
present in result set of last excueted query*/
virtual int GetColumnCount() = 0;
/*Get the next coloumn name*/
virtual const char* NextColomnName(int iClmnCount) = 0;
/*This function returns TRUE if still rows are
der in result set of last excueted query FALSE
if no row present*/
virtual bool Next() = 0;
/*Get the next coloumn data*/
virtual const char* ColomnData(int clmNum) = 0;
/*RELEASE all result set as well as RESET all data*/
virtual void Release() = 0;
};
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How to Use
The test file SQLiteTest.cpp has implmented using SQLLite Wrapper class. For large data insert insertion void
void BeginTransaction(); and
void CommitTransection(); method. Without using these method multiple insertion will take much longer time thn usual.
IResult class have pure virtual method to provide interface to read result data.
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//Get Data From DB
IResult *res=pSQLite->ExcuteSelect("Select * from test;");
if(!res)
cout<<"\n Error:"<<pSQLite->GetLastError().c_str();
else
{
//Get Column Count
int i = res->GetColumnCount();
//Print Colomn Name
for(int k=0;k<i;k++)
{
printf("%s\t",res->NextColomnName(k));
}
cout<<endl;
//Print Result
while(res->Next())
{
for(int k=0;k<i;k++)
printf("%s\t",res->ColomnData(k));
cout<<endl;
}
//release Result Data
res->Release();
}
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Attachments:
[SQLiteTest.cpp]
[SQLLiteWrapper.cpp]
[SQLLiteWrapper.h]
