首先，您需要为userid和metakey组合定义一个唯一的约束：
insert into table_name (id, name, address) values select id, name, address from table_name2 and I want update if it already exists. Am I missing some functionality that would allow me to have it update based on my select list? Or, my update list itself instead of having to repeat st...
然后,我们可以在添加数据之前调用这个函数来检查数据是否已存在: name="Alice"email="alice@example.com"ifnotcheck_data_exist(name,email):sql="INSERT INTO users (name, email) VALUES (%s, %s)"val=(name,email)mycursor.execute(sql,val)mydb.commit()print("Data added successfully!")else:print("Da...
Guys how can i insert into table if record doesn’t exist and update otherwise? CREATE TABLE `testing` ( `name` varchar(200) DEFAULT NULL, `id` int(11) NOT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8; ALTER TABLE `testing` ADD id int NOT NULL AUTO_INCREMENT primary key; INSERT INTO...
You can get the number of affected rows from an insert, update or delete statement. connection.query('DELETE FROM posts WHERE title = "wrong"', function (error, results, fields) { if (error) throw error; console.log('deleted ' + results.affectedRows + ' rows'); }) ...
insert_stmt = mysql.insert(TestTable).values(**data) on_duplicate_key_stmt=insert_stmt.on_duplicate_key_update( {"start_time": data.get("start_time"),"ts": data.get("ts")}) session.execute(on_duplicate_key_stmt) ref: https://stackoverflow.com/questions/15383852/sql-if-exists-update...
"Can't DROP '%-.64s'. Check that column/key exists", #define ER_INSERT_INFO 1092 "Records: %ld Duplicates: %ld Warnings: %ld", #define ER_UPDATE_TABLE_USED 1093 "You can't specify target table '%-.64s' for update in FROM clause", ...
grant select,update,insert,delete on BR to Lbry_reader grant select,insert,update,delete on LogInfo to Lbry_reader 1. 2. 3. 4. 5. 6. 7. 8. 9. 为了验证数据库创建是否成功,我设置了默认添加的用户和数据,默认添加的用户是:“tutu”和“ding”,默认的图书为:“tuBook”和“DingBook”,默认他...
mysql> INSERT INTO books (id, title, author, year_published) VALUES (1,'Green Eggs and Ham','Dr. Seuss', 1960); ERROR 1062 (23000): Duplicate entry'1'forkey'PRIMARY' On the other hand, if we useINSERT IGNORE, the duplication attempt is ignored and no resulting errors occur: ...
if(!empty($_REQUEST['editid'])){ $id=$_REQUEST['editid']; $query="update namedb set title='$title',comment='$com' where id=$id"; header('location:all_category.php'); }else{ $query="INSERT INTO namedb (title,comment) values ...