在使用 SQLite 数据库进行数据处理时,常常会遇到需要将多行数据连接成一个字符串的需求。举例来说,假设我们有一个存储用户名的表,想将这些用户名用逗号分隔组合成一个字符串,以便展示或进一步处理。SQLite 本身不像某些其他数据库系统(如 MySQL、PostgreSQL)那样原生支持直接的字符串聚合函数(如GROUP_CONCAT),但通过...
}//获取连接字符串//private static readonly string str = ConfigurationManager.ConnectionStrings["DBFilerURL"].ConnectionString;//////做增删改的功能//////SQL语句///SQL语句中的参数///<returns>受影响的行数</returns>publicintExecuteNonQuery(stringsql,paramsSQLiteParameter[] ps){//连接数据库using(SQ...
问从sqlite检索字符串形式的数字并转换为intEN版权声明:本文内容由互联网用户自发贡献,该文观点仅代表...
(QString dirPath);//设置数据库存放路径 bool creatDbFile(QString dbName);//生成一个db文件 bool reOpenSql(QString dbName);//打开连接 bool closeSql();//关闭连接 bool queryExec(QString dbName,QString sqlStr);//执行sql语句,不获取结果 bool queryExec(QString dbName,QString sqlStr,QList<Q...
new SQLiteParameter("@companyname",System.Data.DbType.String), new SQLiteParameter("@addtime",System.Data.DbType.DateTime) }; paras[0].Value = TextBox1.Text; paras[1].Value = TextBox2.Text; //返回插入的主键ID //使用select last_insert_rowid()返回自增字段的值 ...
void sqliteDb::errorSql(QString sql){ errorSqlText = sql; qCritical("%s",qPrintable(errorSqlText)); //QString("数据库执行错误:%1 ")+sql.toUtf8().constData();}//获取错误的数据库语句QString sqliteDb::getErrorSql(){ if(databaseName.isEmpty()) { return "db not setting";//数据...
How to choose wich porperty(Collumn) can be insert or not in sqlite ? Or how to insert these array prpoerty thx for looking :) All replies (3) Thursday, July 11, 2019 2:04 PM As far as I know Sqlite can't store arrays. To store it, either transform your array into a string w...
DATEADD(date_string, amount, 'unit') Adds a time interval to a date or datetme DATESUB(date_string, amount, 'unit') Subtracts a time interval from a date or datetime DATEDIFF(date_string1, date_string2, 'unit') Calculates the difference in the specified units between two dates or date...
:OrderColumns<ModelType>;// the columns to use for 'ORDER BY'-clauselimit?:number;// the limit for the 'LIMIT'-clauseoffset?:number;// the offset for the 'LIMIT'-clausetableAlias?:string;// a table alias to use for the query}...
1date(timestring, modifier, modifier, ...)以 YYYY-MM-DD 格式返回日期。例如:date('2023-11-22...