ifnotexists(select*fromErrorConfigwhereType='RetryWaitSeconds') begin insertintoErrorConfig(Type,Value1) values('RetryWaitSeconds','3') end 只能用: 1 2 3 insertintoErrorConfig(Type,Value1) select'RetryWaitSeconds','3' wherenotexists(select*fromErrorConfigwhereType='RetryWaitSeconds') 因为SQLite 中...
三、Sqlserver中: SqlServer中需要另一种写法: IF NOT EXISTS (SELECT id FROMbooksWHERE id = 1)INSERT INTO books (name) SELECT 'Songxingzhu'
SQLite实现ifnotexist类似功能的操作 需要实现：if not exists(select * from ErrorConfig where Type='RetryWaitSeconds')begin insert into ErrorConfig(Type,Value1)values('RetryWaitSeconds','3')end 只能⽤：insert into ErrorConfig(Type,Value1)select 'RetryWaitSeconds','3'where not exists(select * from...
SQL INSERT INTO 语法 INSERT INTO 语句可以有两种编写形式。 第一种形式无需指定要插入数据的列名，...
cur.execute("DROP TABLE IF EXISTS Requisicao") cur.execute("CREATE TABLE Requisicao (cep, logradouro, bairro, uf, ddd, siafi, validation, created json)") cur.executemany("insert into Requisicao values (?, ?, ?, ?, ?, ?, ?, ?)", (data["cep"], ...
sql语句的意思大家应该都知道,IF NOT EXIST如果表addlist不存在则创建它,当我们第二次运行时执行这个语句也不会再创建表了。 3.接下来就可以等待用户的输入了,我们可以给用户一些选择,比如选1表示要添加联系人,选2表示删除联系人,选3表示查询联系人。这个就一个swich语句完了,我就不发代码了。 再开始写函数,首...
queryExec(dbName,queryStr,data)) { return false; } return true; } //增加 bool sqliteDb::addData(QString dbName,QString tableName,QHash<QString,QString> data) { if(data.isEmpty()) return false; QString queryStr="insert into "+tableName+" "; QString fieldStr="(",valueStr="values...
id INT PRIMARY KEY NOT NULL,\ name TEXT NOT NULL,\ age INT NOT NULL)"); sqlQuery.prepare(createSql); // 执行sql语句 if(!sqlQuery.exec()) { qDebug() << "Error: Fail to create table. " << sqlQuery.lastError(); } else ...
// 方法一:使用 bindValue 函数插入单行数据 QSqlQuery sqlQuery; sqlQuery.prepare("INSERT INTO student VALUES(:id,:name,:age)"); sqlQuery.bindValue(":id", max_id + 1); sqlQuery.bindValue(":name", "Wang"); sqlQuery.bindValue(":age", 25); if(!sqlQuery.exec()) { qDebug() << "Er...
TEMP\SQLite.DB". The busy (or lock) timeout for the database can be specified in the respective field. If empty a default value of 100000 milliseconds is used. The Win64 installer (sqliteodbc_w64.exe) was made with SQLite 3.43.2, MingW cross compiler and only rudimentary tested on ...