执行SQL查询语句以获取最后一条记录:var lastRecord string err = db.QueryRow("SELECT * FROM your_table ORDER BY id DESC LIMIT 1").Scan(&lastRecord) if err != nil { // 处理查询错误 } 在上述代码中,your_table是你的表名,id是用于排序的列名。相关...
log('Record count (expected to be 2): ' + rs.rows.item(0).mycount); }, function(error) { console.log('SELECT SQL statement ERROR: ' + error.message); }); See the Sample section for a sample with a more detailed explanation. Status WP8 platform is no longer supported by this ...
ui->actRecNext->setEnabled(!last); ui->actRecLast->setEnabled(!last); // QModelIndex curIndex=theSelection->currentIndex();//获取当前选择单元格的模型索引 int curRecNo=theSelection->currentIndex().row(); QSqlRecord curRec=qryModel->record(curRecNo); //获取当前记录 int empNo=curRec.value(...
QSqlRecord record = tabModel->record(); // 断开现有Qt管理的数据库连接,并连接到一个新的数据库文件 QString connectionName = "NewConnection"; QSqlDatabase newDB = QSqlDatabase::addDatabase("QSQLITE", connectionName); QString saveFilePath = QFileDialog::getSaveFileName(nullptr, "Save File"...
last_insert_rowid():返回最后插入的数据的ID *** sqlite3提供了C函数接口来操作sqlite3数据库,其中有个关键数据结构 sqlite3 * 类型 1、打开数据库 int sqlite3_open(文件名,sqlite3 **); - 文件名若不存在,则会自动创建 返回SQLITE_OK表示操作正常,这些宏的定义在sqlite3.h文件中定义,看源代码会懂的更...
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bool MainWindow::GetAllImageRecord() { ……… // 查询表格数据 const QString cmdSql = R"(SELECT * FROM image_table;)"; //QSqlQuery构造前,需要db已打开并连接;未指定db或者db无效时使用默认连接进行操作 QSqlQuery myQuery(m_Projdb); if(!myQuery.exec(cmdSql)) { QString sError = myQ...
int sqlite3_get_table(sqlite3*,const char *sql,char ***resultp,int *nrow,int *ncolumn,char **errmsg);参数3:resultp 是一维数组,第一行是字段名称,跟着是每个字段的值参数4:查询共多少条记录参数5:查询共多少个字段操作实例如下: int main(int ,char **) { sqlite3 *db; int result; ...
track.LastTimePlayed = reader.GetDateTime(4); track.MusicBrainzId = reader.GetValue(5)?.ToString(); track.Duration = XmlConvert.ToTimeSpan(reader.GetString(6));varcoverId = reader.ReadGuid(7);if(coverId != Guid.Empty) track.Cover = _imageProvider.Collection[coverId]; ...
sqlite3BtreeLast moveToRoot // 移到最上 getAndInitPage 读pgnoRoot页磁盘数据 包括根节点的各种信息,cell列表,子节点页号等等。 见https://sqlite.org/fileformat2.html#record_format moveToRightmost // 移到最右边即最后一个数据 while(不是叶子节点) pgno = get4byte(&pPage->aData[pPage->hdrOffs...