SQLite3的使用
1.下载sqlite3相关文件sqlite3.dll、sqlite3.h(可从http://download.csdn.net/detail/mingxia_sui/5249070下载)，添加到工程的根目录下。
2. QT += sql
LIBS += sqlite3.dllQt的.pro文件中要加上以上两句。这样就可以调用sqlite3中的数据库操作函数了。3.以下的例子是一个已经封装好的类，可以直接调用哦！******************************************************************************************************************************************************************************.h文件代码：#ifndef SKMONITORSQL_H #define SKMONITORSQL_H #include <QObject> #include <QDateTime> #include "sqlite3.h" #include <QStringList> class QSKMonitorSQL : public QObject { Q_OBJECT public: explicit QSKMonitorSQL(QString sFileName, QObject *parent = 0); bool fn_connectSQL(); bool fn_closeSQL(); void fn_InitTable(QString sTableName, QStringList sNameList, QStringList sType); void fn_InitTableForBase(QString sTableName, QStringList sNameList, QStringList sType); void fn_InsertData(QString sTableName, QStringList sDataList, QDateTime dt); void fn_InsertDataForBase(QString sTableName, QStringList sDataList); int fn_UpdateData(QString sTableName, QStringList sDataList,int index); void fn_DeleteData(QString sTableName); int fn_QueryDataByIndex(QString sTableName, int iStart,int iNumber,QVector<QStringList> *pData); int fn_QueryDataByTime(QString sTableName, QDateTime dtStart,QDateTime dtEnd,QVector<QStringList> *pData); int fn_QueryDataByValue(QString sTableName, int nType, QString sFrontV, QString sBackV, QVector<QStringList> *pData); int fn_QueryAllData(QString sTableName, QVector<QStringList> *pData); int fn_RecordSize(QString sTableName); uint fn_GetMinRowID(QString sTableName); bool fn_RecordSizeByTime(QString sTableName, QDateTime dtStart, QDateTime dtEnd, int *pRows, int *pMaxID,int *pMinID); QString fn_UnicodeToUTF8(QString str); void fn_StartBegin(); void fn_StartCommit(); bool m_bDBIsOk; int m_nSetMaxRecordNum; bool m_bSetRecordFlag; void fn_SetMaxRowId(int nMaxRows); public: bool m_bStartBegin; bool m_bStartCommit; signals: public slots: private: QString m_sDB; QString m_sInsertT1; QString m_sUpdateT1; QString m_sTable; QStringList m_sTitleList; //列名 int m_nColumn; sqlite3 *m_pdb; //数据库 char *m_pzErrMsg; //出错信息 char *m_perrmsg; //出错信息 char **m_ppazResult; }; #endif // SKMONITORSQL_H***************************************************************************************.cpp文件：***************************************************************************************#include "SKMonitorSQL.h" #include <QTextCodec> #include <QVector> QSKMonitorSQL::QSKMonitorSQL(QString sFileName, QObject *parent) : QObject(parent) { m_pdb = NULL; m_nSetMaxRecordNum = 0; m_bSetRecordFlag = false; //编码转换 m_sDB = fn_UnicodeToUTF8(sFileName);//编码转换 m_bStartBegin = false; //初始化没有插入BEGIN命令 m_bStartCommit = false; //初始化没有插入COMMIT命令 } /********************************************************************************************* Func: 连接到指定数据库 input: null ouput:null ********************************************************************************************/ bool QSKMonitorSQL::fn_connectSQL() { if( (sqlite3_open(m_sDB.toAscii().data(), &m_pdb)) != 0 ) //打开指定的数据库文件,如果不存在将创建一个同名的数据库文件 { m_bDBIsOk = false; return false; } m_bDBIsOk = true; return true; } /********************************************************************************************* Func: 关闭指定数据库 input: null ouput:null ********************************************************************************************/ bool QSKMonitorSQL::fn_closeSQL() { if (m_pdb!=NULL) { sqlite3_close(m_pdb); } return false; } /********************************************************************************************* Func: 运行BEGIN命令 input: null ouput:null ********************************************************************************************/ void QSKMonitorSQL::fn_StartBegin() { if (m_bStartBegin == false) { if (m_pdb != NULL) { QString stmp; stmp = "begin;"; stmp = fn_UnicodeToUTF8(stmp); //编码转换 sqlite3_exec( m_pdb , stmp.toAscii().data() , 0 , 0 , &m_pzErrMsg ); m_bStartBegin = true; m_bStartCommit = false; } } } /********************************************************************************************* Func: 运行commit命令 input: null ouput:null ********************************************************************************************/ void QSKMonitorSQL::fn_StartCommit() { if (m_bStartCommit == true) //提交，存入磁盘 { if (m_pdb != NULL) { QString stmp; stmp = "commit;"; stmp = fn_UnicodeToUTF8(stmp); //编码转换 sqlite3_exec( m_pdb , stmp.toAscii().data() , 0 , 0 , &m_pzErrMsg ); m_bStartBegin = false; m_bStartCommit = false; } } } /********************************************************************************************* Func: 初始化数据表 input: 表名，表列名 ouput:null ********************************************************************************************/ void QSKMonitorSQL::fn_InitTable(QString sTableName, QStringList sNameList, QStringList sType) { fn_StartBegin(); if (m_pdb!=NULL) { QString stmp; stmp = "create table " + sTableName + "(logtime datetime"; for (int i=0;i<sNameList.size();i++) { stmp = stmp + "," + sNameList.at(i) + " " + sType.at(i); } stmp = stmp + ")"; stmp = stmp + ";"; stmp = fn_UnicodeToUTF8(stmp);//编码转换 sqlite3_exec(m_pdb, stmp.toAscii().data(), NULL, NULL, &m_pzErrMsg); m_sInsertT1 = "insert into "; m_sInsertT1 = m_sInsertT1 + sTableName + " values("; //记录插入语句部分str m_sTable = sTableName; //表的名字 m_nColumn = sNameList.size() + 1; //列总数=记录列数+时间 m_sUpdateT1 = "update " + sTableName; //记录修改语句 m_sUpdateT1 = m_sUpdateT1 + " set "; m_sTitleList = sNameList; //列名称 } fn_StartCommit(); } /********************************************************************************************* Func: 初始化数据表 input: 表名，表列名 ouput:null ********************************************************************************************/ void QSKMonitorSQL::fn_InitTableForBase(QString sTableName, QStringList sNameList, QStringList sType) { fn_StartBegin(); if (m_pdb!=NULL) { QString stmp; stmp = "create table " + sTableName + "("; for (int i=0;i<sNameList.size();i++) { if (i != 0) { stmp += ","; } stmp = stmp + sNameList.at(i) + " " + sType.at(i); } stmp = stmp + ")"; stmp = stmp + ";"; stmp = fn_UnicodeToUTF8(stmp);//编码转换 sqlite3_exec(m_pdb, stmp.toAscii().data(), NULL, NULL, &m_pzErrMsg); m_sInsertT1 = "insert into "; m_sInsertT1 = m_sInsertT1 + sTableName + " values("; //记录插入语句部分str m_sTable = sTableName; //表的名字 m_nColumn = sNameList.size() + 1; //列总数=记录列数+时间 m_sUpdateT1 = "update " + sTableName; //记录修改语句 m_sUpdateT1 = m_sUpdateT1 + " set "; m_sTitleList = sNameList; //列名称 } fn_StartCommit(); } /********************************************************************************************* Func: 增加数据到数据库 input: null ouput:null ********************************************************************************************/ void QSKMonitorSQL::fn_InsertData(QString sTableName, QStringList sDataList, QDateTime dt) { fn_StartBegin(); if (m_pdb!=NULL) { if (m_bSetRecordFlag)//设置了最大行数 { int nMaxRecordSize = fn_RecordSize(sTableName);//当前最大记录数 if (nMaxRecordSize < 0) return; if (nMaxRecordSize >= m_nSetMaxRecordNum)//超出限制，删掉开始项 { QString stmp; stmp = "delete from "; stmp = stmp + sTableName; stmp = stmp + " where rowid <= (select min(rowid) from "; stmp = stmp + sTableName + ");"; stmp = fn_UnicodeToUTF8(stmp);//编码转换 sqlite3_exec(m_pdb, stmp.toAscii().data(), NULL, NULL, &m_pzErrMsg); } QString stmp; stmp = "insert into "; stmp = stmp + sTableName + " values("; QString sdatetime = dt.toString("yyyy-MM-dd hh:mm:ss"); stmp = stmp + "'"; stmp = stmp + sdatetime; stmp = stmp + "'"; for (int i=0;i<sDataList.size();i++) { stmp = stmp + ",'"; stmp = stmp + sDataList.at(i) + "'"; } stmp = stmp + ")"; stmp = stmp + ";"; stmp = fn_UnicodeToUTF8(stmp);//编码转换 sqlite3_exec(m_pdb, stmp.toAscii().data(), NULL, NULL, &m_pzErrMsg ); } else { QString stmp; stmp = "insert into "; stmp = stmp + sTableName + " values("; QString sdatetime = dt.toString("yyyy-MM-dd hh:mm:ss"); stmp = stmp + "'"; stmp = stmp + sdatetime; stmp = stmp + "'"; for (int i=0;i<sDataList.size();i++) { stmp = stmp + ",'"; stmp = stmp + sDataList.at(i) + "'"; } stmp = stmp + ")"; stmp = stmp + ";"; stmp = fn_UnicodeToUTF8(stmp);//编码转换 sqlite3_exec(m_pdb, stmp.toAscii().data(), NULL, NULL, &m_pzErrMsg ); } } fn_StartCommit(); } /********************************************************************************************* Func: 增加数据到数据库 input: null ouput:null ********************************************************************************************/ void QSKMonitorSQL::fn_InsertDataForBase(QString sTableName, QStringList sDataList) { fn_StartBegin(); if (m_pdb!=NULL) { QString stmp; stmp.clear(); stmp = "insert into "; stmp = stmp + sTableName + " values("; for (int i=0; i<sDataList.size(); i++) { if (i != 0) { stmp = stmp + ","; } stmp = stmp + "'"; stmp = stmp + sDataList.at(i) + "'"; } stmp = stmp + ")"; stmp = stmp + ";"; stmp = fn_UnicodeToUTF8(stmp);//编码转换 sqlite3_exec(m_pdb ,stmp.toAscii().data(), NULL, NULL, &m_pzErrMsg); } fn_StartCommit(); } /********************************************************************************************* Func: 修改数据库数据 input: null ouput:null ********************************************************************************************/ int QSKMonitorSQL::fn_UpdateData(QString sTableName, QStringList sDataList, int index) { int nRet = -1; fn_StartBegin(); if (m_pdb!=NULL) { QString stmp; int isize; stmp = "update " + sTableName; //修改语句 stmp = stmp + " set "; isize = sDataList.size(); for (int i=0;i<isize;i++) { stmp = stmp + m_sTitleList.at(i); stmp = stmp + " = "; stmp = stmp + "'"; stmp = stmp + sDataList.at(i); stmp = stmp + "'"; if (i != isize - 1) //不是最后一个时 { stmp = stmp + ","; } } stmp = stmp + " where rowid = (select MIN(rowid) + "; stmp = stmp + QString::number(index); stmp = stmp + " from "; stmp = stmp + m_sTable; stmp = stmp + ")"; stmp = stmp + ";"; stmp = fn_UnicodeToUTF8(stmp);//编码转换 nRet = sqlite3_exec(m_pdb, stmp.toAscii().data(), NULL, NULL, &m_pzErrMsg ); } fn_StartCommit(); return nRet; } /********************************************************************************************* Func: 删除数据 input: null ouput:null ********************************************************************************************/ void QSKMonitorSQL::fn_DeleteData(QString sTableName) { fn_StartBegin(); if (m_pdb!=NULL) { QString stmp; stmp = "delete from "; stmp = stmp + sTableName; stmp = stmp + ";"; stmp = fn_UnicodeToUTF8(stmp);//编码转换 sqlite3_exec(m_pdb , stmp.toAscii().data() , NULL , NULL , &m_pzErrMsg ); } fn_StartCommit(); } /********************************************************************************************* Func: 上电时获得最小的rowid序号 input: null ouput:null ********************************************************************************************/ uint QSKMonitorSQL::fn_GetMinRowID(QString sTableName) { if (m_pdb!=NULL) { QString stmp; stmp = "select min(rowid) from "; stmp = stmp + sTableName; stmp = stmp + ";"; int nRow; int nColumn; stmp = fn_UnicodeToUTF8(stmp);//编码转换 int result = sqlite3_get_table(m_pdb, stmp.toAscii().data(), &m_ppazResult, &nRow, &nColumn, &m_pzErrMsg ); if (result == SQLITE_OK) { QString sData; sData.sprintf("%s", m_ppazResult[1]); int nMin; nMin = sData.toInt(); sqlite3_free_table(m_ppazResult); //释放 return nMin; } else { sqlite3_free_table(m_ppazResult); //释放 return 0; } } else { return 0; } } /********************************************************************************************* Func: 获得数据库记录大小 input: null ouput:记录条数 ********************************************************************************************/ int QSKMonitorSQL::fn_RecordSize(QString sTableName) { if (m_pdb!=NULL) { QString stmp; stmp = "select count(*) from "; stmp = stmp + sTableName; int nRow; int nColumn; stmp = fn_UnicodeToUTF8(stmp);//编码转换 int result = sqlite3_get_table(m_pdb , stmp.toAscii().data(), &m_ppazResult , &nRow , &nColumn , &m_pzErrMsg ); if (result == SQLITE_OK) { QString sNum; sNum.sprintf("%s",m_ppazResult[1]); sqlite3_free_table(m_ppazResult); return sNum.toInt(); } else { sqlite3_free_table(m_ppazResult); return -1; } } else { return 0; } } /********************************************************************************************* Func: 获取数据库全部数据 input: pData-返回的查询数据 ouput:返回查询结果总数 ********************************************************************************************/ int QSKMonitorSQL::fn_QueryAllData(QString sTableName, QVector<QStringList> *pData) { if (m_pdb!=NULL) { QString stmp; stmp = "select * from "; stmp = stmp + sTableName; //格式化查询语句 int nRow; int nColumn; int result = sqlite3_get_table(m_pdb , stmp.toAscii().data(), &m_ppazResult , &nRow , &nColumn , &m_pzErrMsg ); if (result == SQLITE_OK) { QStringList listTmp; QString sData; for (int i=0;i<nRow;i++) { int iTmp; iTmp = (i + 1)*nColumn; //返回数据中，前nColumn个是字段名字，偏移字段数目 for (int j=0;j<nColumn;j++) { sData.sprintf("%s",m_ppazResult[iTmp + j]); listTmp.append(sData); } pData->append(listTmp); listTmp.clear(); } sqlite3_free_table(m_ppazResult); //释放 return nRow; } else { sqlite3_free_table(m_ppazResult); //释放 return -1; } } else { return -1; } } /********************************************************************************************* Func: 按序号查询指定范围的数据 input: iStart-开始rowid序号 iNumber-查询总数 pData-返回的查询数据 ouput:返回查询结果总数 ********************************************************************************************/ int QSKMonitorSQL::fn_QueryDataByIndex(QString sTableName, int iStart, int iNumber, QVector<QStringList> *pData) { if (m_pdb!=NULL) { QString stmp; stmp = "select * from "; stmp = stmp + sTableName + " "; stmp = stmp + "where rowid >= "; stmp = stmp + QString::number(iStart) + " limit "; stmp = stmp + QString::number(iNumber); int nRow; int nColumn; int result = sqlite3_get_table(m_pdb , stmp.toAscii().data(), &m_ppazResult , &nRow , &nColumn , &m_pzErrMsg ); if (result == SQLITE_OK) { QStringList listTmp; QString sData; for (int i=0;i<nRow;i++) { int iTmp; iTmp = (i + 1)*nColumn; //返回数据中，前nColumn个是字段名字，偏移字段数目 for (int j=0;j<nColumn;j++) { sData.sprintf("%s",m_ppazResult[iTmp + j]); listTmp.append(sData); } pData->append(listTmp); listTmp.clear(); } sqlite3_free_table(m_ppazResult); //释放 return nRow; } else { sqlite3_free_table(m_ppazResult); //释放 return -1; } } else { return -1; } } /********************************************************************************************* Func: 按时间查询指定范围的数据 input: dtStart-开始时间 dtEnd-结束时间 pData-返回的查询数据 ouput:返回查询结果总数 ********************************************************************************************/ int QSKMonitorSQL::fn_QueryDataByTime(QString sTableName, QDateTime dtStart, QDateTime dtEnd, QVector<QStringList> *pData) { if (m_pdb!=NULL) { QString stmp; stmp = "select * from "; stmp = stmp + sTableName + " "; stmp = stmp + "where logtime >= "; stmp = stmp + "'" + dtStart.toString("yyyy-MM-dd hh:mm:ss") + "'" + " and logtime <= "; stmp = stmp + "'" + dtEnd.toString("yyyy-MM-dd hh:mm:ss") + "'"; int nRow; int nColumn; int result = sqlite3_get_table(m_pdb , stmp.toAscii().data(), &m_ppazResult , &nRow , &nColumn , &m_pzErrMsg ); if (result == SQLITE_OK) { QStringList listTmp; QString sData; for (int i=0;i<nRow;i++) { int iTmp; iTmp = (i + 1)*nColumn; //返回数据中，前nColumn个是字段名字，偏移字段数目 for (int j=0;j<nColumn;j++) { sData.sprintf("%s",m_ppazResult[iTmp + j]); listTmp.append(sData); } pData->append(listTmp); listTmp.clear(); } sqlite3_free_table(m_ppazResult); //释放 return nRow; } else { sqlite3_free_table(m_ppazResult); //释放z return -1; } } else { return 0; } } /********************************************************************************************* Func: 按值查询指定范围的数据 input: nType-比较条件 nFrontV-比较前值 nBackV-比较后值 pData-返回的查询数据 ouput:返回查询结果总数 ********************************************************************************************/ int QSKMonitorSQL::fn_QueryDataByValue(QString sTableName, int nType, QString sFrontV, QString sBackV, QVector<QStringList> *pData) { return true; } /********************************************************************************************* Func: 有开始时间和结束时间算出这段时间有多少数据 input: 开始时间 结束时间 返回行数 最小rowid ouput:找到数据返回1 没有找到返回0 Select count(*) From MAIN.[hisdata] where hisdata.logtime >= '2012-05-24 15:53:48' and hisdata.logtime >= '2012-05-24 15:55:48' ; ********************************************************************************************/ bool QSKMonitorSQL::fn_RecordSizeByTime(QString sTableName, QDateTime dtStart, QDateTime dtEnd, int *pRows, int *pMaxID,int *pMinID) { if (m_pdb!=NULL) { QString stmp; stmp = "select count(*), MIN(rowid), MAX(rowid) from "; stmp = stmp + sTableName + " "; stmp = stmp + "where logtime >= "; stmp = stmp + "'" + dtStart.toString("yyyy-MM-dd hh:mm:ss") + "'" + " and logtime <= "; stmp = stmp + "'" + dtEnd.toString("yyyy-MM-dd hh:mm:ss") + "'"; int nRow; int nColumn; int result = sqlite3_get_table(m_pdb , stmp.toAscii().data(), &m_ppazResult , &nRow , &nColumn , &m_pzErrMsg ); if (result == SQLITE_OK) { QString sData; int counts; sData.sprintf("%s",m_ppazResult[3]); //获得返回条数 counts = sData.toInt(); //行数 if (counts == 0) //没有数据 { *pRows = counts; *pMinID = 0; *pMaxID = 0; } else { *pRows = counts; sData.sprintf("%s",m_ppazResult[4]); //获得最小rowid *pMinID = sData.toInt(); sData.sprintf("%s",m_ppazResult[5]); //获得最大rowid *pMaxID = sData.toInt(); } } sqlite3_free_table(m_ppazResult); //释放 return 1; } else { *pRows = 0; *pMinID = 0; *pMaxID = 0; return 0; } } /********************************************************************************************* Func: 设置最大行数 input: nMaxRows：最大行数值 ouput: 无 ********************************************************************************************/ void QSKMonitorSQL::fn_SetMaxRowId(int nMaxRows) { m_nSetMaxRecordNum = nMaxRows; m_bSetRecordFlag = true; } /********************************************************************************************* Func: unicode 到UTF8转换 input: null ouput:null ********************************************************************************************/ QString QSKMonitorSQL::fn_UnicodeToUTF8(QString str) { QString sName; QByteArray baT4; baT4.clear(); baT4=QTextCodec::codecForName("UTF8")->fromUnicode(str); sName = (QString)baT4; return sName; }******************************************************************************************************************************************************************************That's all!