Sqlite3批量写入数据到数据库中

1、创建或者打开数据库

int nResult = sqlite3_open(strDBPath.c_str(),&pDb);
if (SQLITE_OK != nResult)
{
sqlite3_close(pDb);
pDb = NULL;
AfxMessageBox("创建数据库文件失败！");
return pDb;
}2、创建数数据据库表，如果是打开就无需这一步的创建

std::string strSQL = "create table T_AIS_GRID"
"(ID NUMBER PRIMARY KEY,"
"MMSI VARCHAR2(20) not NULL,"
"CHANNEL VARCHAR2(1) not NULL,"
"GRIDX VARCHAR2(20) not NULL,"
"GRIDY VARCHAR2(20) not NULL,"
"LONGITUDE NUMBER,"
"LATITUDE NUMBER,"
"SPEED NUMBER,"
"HEADING NUMBER,"
"COURSE NUMBER,"
"TIME NUMBER,"
"DESTINATION VARCHAR2(20),"
"NOTE VARCHAR2(100)"
")";
nResult = sqlite3_exec(pDb,strSQL.c_str(),NULL,NULL,&errmsg);
if (SQLITE_OK != nResult)
{
sqlite3_close(pDb);
pDb = NULL;
AfxMessageBox("创建表失败！");
return pDb;
}

3、设置属性，比如内存大小、读写速度等

void  SetAttributes(sqlite3*pDB)
{
std::string         lstrSQL ;
SYSTEM_INFO         lsiSysInfo;
TCHAR               ltcBuf[MAX_PATH] ;

GetSystemInfo(&lsiSysInfo);
memset(ltcBuf,0,MAX_PATH) ;
sprintf_s(ltcBuf,MAX_PATH,"PRAGMA page_size = %d;",lsiSysInfo.dwPageSize );
lstrSQL = ltcBuf ;
Pragmas(pDB,lstrSQL);
/**  设置页面计数*/
lstrSQL = "PRAGMA max_page_count = 1073741823 ;";
Pragmas(pDB,lstrSQL);
/**  设置空间自动回收*/
lstrSQL = "PRAGMA auto_vacuum = 0;"  ;
Pragmas(pDB,lstrSQL);
/**  设置本次打开的缓冲大小,对读写速度无太大影响*/
lstrSQL =  "PRAGMA cache_size = 8192;"  ;
Pragmas(pDB,lstrSQL);
/**  设置默认缓冲大小失败,对读写速度无太大影响*/
lstrSQL =  "PRAGMA default_cache_size = 8192;"  ;
Pragmas(pDB,lstrSQL);
/**  设置使用UTF8编码*/
lstrSQL =  "PRAGMA encoding     = 'UTF-8'; "  ;
Pragmas(pDB,lstrSQL);

}

bool Pragmas(sqlite3*pDB,std::string lstrCommands)
{
try
{
if(pDB)
{
std::string     lstrSQL = lstrCommands ;
if(sqlite3_exec(pDB ,ASCIItoUTF8(lstrSQL).c_str(), NULL, NULL, NULL) != SQLITE_OK )
{
//ACE_ERROR((LM_ERROR,ACE_TEXT("[%D(%t)]    Pragmas fail : %s\n"),lstrSQL.c_str()));
}
else
{
#ifdef PRAGMAS_QUERY
sqlite3_stmt*       lstmt ;
const char*         ltail ;
lstrSQL = lstrCommands.substr(0,lstrCommands.find(_T("=")));
lstrSQL += _T(";");
if(sqlite3_prepare(pDB,ASCIItoUTF8(lstrSQL).c_str(), -1, &lstmt, <ail) != SQLITE_OK)
{
//ACE_ERROR((LM_ERROR,ACE_TEXT("[%D(%t)] SQLite error:prepare sql failure:%s , error: %s\n"),lstrSQL.c_str(),sqlite3_errmsg(m_pDB)));
}
while(sqlite3_step(lstmt) == SQLITE_ROW)
{
if(sqlite3_column_count(lstmt) == 1)
{
//ACE_DEBUG((LM_DEBUG,ACE_TEXT("[%D(%t)] Set:%s Query:%s \n"),lstrCommands.c_str(), (char *)sqlite3_column_text(lstmt,0))) ;
}
}
sqlite3_finalize(lstmt);
#endif
//ACE_DEBUG ((LM_DEBUG,"[%D(%t)]  SQLite release memory: %.04fMB \n",sqlite3_release_memory((int)sqlite3_memory_highwater(true))/(1024*1024.f)));
return true ;
}
}
else
{
//ACE_ERROR((LM_ERROR,ACE_TEXT("[%D(%t)]    Pragmas fail : SQLite db not open\n")));
}
}
catch(...)
{
//ACE_ERROR((LM_ERROR,ACE_TEXT("[%D(%t)]    Exc pragma command exception: %s\n"),lstrCommands.c_str()));
}
return false ;
}

4、准备插入

sqlite3_stmt * stat = NULL;

std::string strSQLG  ="INSERT INTO T_AIS_GRID (ID,MMSI,CHANNEL,GRIDX,GRIDY,LONGITUDE,LATITUDE,SPEED,HEADING,COURSE,TIME,DESTINATION) VALUES (?1,?2,?3,?4,?5,?6,?7,?8,?9,?10,?11,?12)";//问号？代表这些字段的值目前为不确定的值，赋值在后面，数字表示第几个字段
int result =sqlite3_prepare_v2(pDb,strSQLG.c_str(),-1,&stat, NULL);
if(result != SQLITE_OK )
{
DWORD E = GetLastError();
sqlite3_reset(stat);
sqlite3_close(pDb);
pDbG = NULL;
AfxMessageBox("数据插入失败！");
return;
}

5、开始事务

std::string strTrans = "begin transaction;";//开始执行事务
int nRet = sqlite3_exec(pDb, strTrans.c_str(), 0, 0, &errmsg);
if (nRet == SQLITE_OK)
{
nRet = sqlite3_changes(pDb);
}
else
{
sqlite3_finalize(stat); //把刚才分配的内容析构掉
sqlite3_close(pDb);
pDb = NULL;
return;
}

6、为每一个字段绑定变量

for(int i = 0 ;i < num;i++)

{bind(stat,1, (int)(j+1));
bind(stat,2, (char*)strID.c_str());
bind(stat,3, (char*)strChannel.c_str());
bind(stat,4, (char*)strX.c_str());
bind(stat,5, (char*)strY.c_str());
bind(stat,6, (double)dLon);
bind(stat,7, (double)dLat);
bind(stat,8, (double)fSpeed);
bind(stat,9, (double)fHeading);
bind(stat,10, (double)fCourse);
bind(stat,11,(__int64)i64CurTime);
bind(stat,12,(char*)ASCIItoUTF8(strDes).c_str());

//bind(stat,14,(const UCHAR*)pBuf,totallength);//这个是对Blob字段进行插入，pBuf里面存入的是二进制

int result = sqlite3_step(stat);//返回101是执行成功
                        result     = sqlite3_reset(stat);

}//中文字符需要转换成数据库要的格式UTF8

void bind(sqlite3_stmt * stat,int nParam, const char* szValue)
{
if (stat!=NULL)
{
int nRes = sqlite3_bind_text(stat, nParam, szValue, -1, SQLITE_TRANSIENT);
if (nRes != SQLITE_OK)
{
return;
}
}
}

void bind(sqlite3_stmt * stat,int nParam, const int nValue)
{
if (stat!=NULL)
{
int nRes = sqlite3_bind_int(stat, nParam, nValue);
if (nRes != SQLITE_OK)
{
return;
}
}
}

void bind(sqlite3_stmt * stat,int nParam, const __int64 llValue)
{
if (stat!=NULL)
{
int nRes = sqlite3_bind_int64(stat, nParam, llValue);
if (nRes != SQLITE_OK)
{
return;
}
}
}

void bind(sqlite3_stmt * stat,int nParam, const double dValue)
{
if (stat!=NULL)
{
int nRes = sqlite3_bind_double(stat, nParam, dValue);
if (nRes != SQLITE_OK)
{
return;
}
}
}

void bind(sqlite3_stmt * stat,int nParam, const unsigned char* blobValue, int nLen)
{
int nRes = sqlite3_bind_blob(stat, nParam,(const void*)blobValue, nLen, SQLITE_TRANSIENT);
if (nRes != SQLITE_OK)
{
return;
}
}

7、执行/提交以上的事务（一次性批量的写入到数据库中，而不需要一条一条的）

strTrans = "commit transaction;";
nRet = sqlite3_exec(pDb, strTrans.c_str(), 0, 0, &errmsg);
if (nRet == SQLITE_OK)
{
nRet = sqlite3_changes(pDb);
}
else
{
sqlite3_finalize(stat); //把刚才分配的内容析构掉
sqlite3_close(pDb);
pDbM = NULL;
return;
}
sqlite3_finalize(stat); //把刚才分配的内容析构掉
sqlite3_close(pDb);