DELETE FROM 表【WHERE 条件语句】 如果设定 WHERE 条件子句,则删除符合条件的数据记录;如果没有设定条件语句,则删除所有记录 删除特定时间范围的记录 delete from table_name where datetime(字段)<datetime("time str"); # "time str" >>> 年月日时分秒,如"2021-01-16 10:00:00",或者"2021-01-15" # ...
https://www.sqlshack.com/delete-cascade-and-update-cascade-in-sql-server-foreign-key/ 另外，如果...
; userData.userid = 999; userData.signture = "宾利"; userData.RegisterTime = DateTime.Now; //插入一条数据 mDB.Insertable(userData).ExecuteCommand(); //删除所有签名为宾利的所有数据 如果没有这个数据,返回值为0 int deleteCount = mDB.Deleteable<UserDataTabel>().Where(t => t.signture == "...
deleteTable(str2); qDebug() << "isTabelExist:" << sqliteBasic.isTableExist(str2); //关闭数据库 sqliteBasic.closeDb(); } MainWindow::~MainWindow() { delete ui; } 运行结果如下(目前只做了终端): 3. db数据库访问操作 数据库以db文件形式存在,可通过Navicat访问和操作数据库。 参考资料 1...
Delete something from SQLiteDatabase storIOSQLite.delete() .byQuery(DeleteQuery.builder() .table("tweets") .where("timestamp <= ?") .whereArgs(System.currentTimeMillis() -86400)// No need to write String.valueOf().build()) .prepare() .executeAsBlocking(); ...
Close/delete database bugs described below. When a database is opened and deleted without closing, the iOS/macOS platform version is known to leak resources. It is NOT possible to open multiple databases with the same name but in different locations (iOS/macOS platform version). Incorrect or ...
SQLITE_SECURE_DELETE Overwrite deleted content with zeros SQLITE_SOUNDEX Enable soundex SQL function SQLITE_THREADSAFE Setting the multithreading mode (default: serialized) SQLITE_USE_URI Enable URI file names SQLITE_USER_AUTHENTICATION User authentication extension Key based database encryption support The ...
SQLiteDatabase has methods to create, delete, execute SQL commands, and perform other common database management tasks. See the Notepad sample application in the SDK for an example of creating and managing a database. Database names must be unique within an application, not across all applicatio...
Writable Schema_writable_schemaBooleanWhen this pragma is on, the SQLITE_MASTER tables in which database can be changed using ordinary UPDATE, INSERT, and DELETE statements. Warning: misuse of this pragma can easily result in a corrupt database file. ...
Import data into a database from various formats, or through an ODBC connection after setting up a data source connection. Seamlessly export data from tables, collections, views, or query results to popular formats such as Excel, Access, CSV and more. ...