如果想查询 tag 列中包含 love 的所有行,在MySQL中有JSON_CONTAINS可以使用,比如下面的 SQL: 代码语言:javascript 复制 SELECT*from my_tableWHEREJSON_CONTAINS(tags,'"love"') 但是在 SQLite 中并没有类似JSON_CONTAINS的函数。 2.json_each() 如果要在 SQLite 中判断一个JSON数组中是否包含某个值,可以使用 ...
WHERE (SELECT PluID FROM PLU WHERE PluID = NEW.PluID) IS NULL; END; BEFORE UPDATE ON PluSuit FOR EACH ROW BEGIN SELECT RAISE(ROLLBACK, 'update on table "PluSuit" violates foreign key constraint "fk_plu_id"') WHERE (SELECT PluID FROM PLU WHERE PluID = NEW.PluID) IS NULL; END;...
(string sql = "SELECT name FROM sqlite_master WHERE type ='table'") { SQLiteCommand command = new SQLiteCommand(sql, connection); SQLiteDataReader reader = command.ExecuteReader(); List<string> results = new List<string>(); while (reader.Read()) { string[] row = new string[reader....
.WhereIF(!input.ContactMobile.IsNullOrWhiteSpace(), t => t.ContactMobile.Contains(input.ContactMobile)) //如需要精确匹配则用Equals .WhereIF(!input.Email.IsNullOrWhiteSpace(), t => t.Email.Contains(input.Email)) //如需要精确匹配则用Equals .WhereIF(!input.QQ.IsNullOrWhiteSpace(), t => t.QQ...
QSqlQuery sql_query(m_database);//不这样初始化,会出现"QSqlQuery::prepare: database not open" QString str_select_SQL = "SELECT * FROM RTData WHERE Id = ?"; sql_query.prepare(str_select_SQL); sql_query.addBindValue(id); if (!sql_query.exec()) { qDebug("getItem[%d] - 失败!!!
if(QSqlDatabase::contains("qt_sql_default_connection")) { db = QSqlDatabase::database("qt_sql_default_connection");\ } else { db = QSqlDatabase::addDatabase("QSQLITE"); } db.setDatabaseName("DBTest.db"); } 1. 2. 3. ...
if(database.tables().contains(tableName)) { return true; } return false; } // 查询全部数据 void SqliteOperator::queryTable() { QSqlQuery sqlQuery; sqlQuery.exec("SELECT * FROM student"); if(!sqlQuery.exec()) { qDebug() << "Error: Fail to query table. " << sqlQuery.lastError(...
Thekeywordhash.hheader file contains the definition of a hash table that maps SQL language keywords (ex: "CREATE", "SELECT", "INDEX", etc.) into the numeric codes used by the parse.c parser. The keywordhash.h file is generated by a C-language program at tool mkkeywordhash.c. ...
假设前缀有一个尾随的空格，那么在前缀后面加上一个空格就可以避免这个问题，同样地，在后缀前面加上一...
.Where(it => il.Contains(it.Id)) .ToListAsync(); } Console.WriteLine("READ FINISH"); } catch(Exception ex) { Console.WriteLine("READ" + ex.Message); } } private void InitDB()//初始化Connection连接字符串和Student表 { _connectionString = @"Data Source=D:\SqlSugar4xTest.sqlite;Version...