on-duplicate-key

问题 I have to write a query to update a record if it exists else insert it. I am doing this update/insert into a postgres DB. I have looked into the upsert examples and most of them use maximum of two fields to update. However, I want to update multiple columns. Example: query="""INSERT INTO table (col1,col2,col3,col4,col5,col6,col7,col8,col9,..col20) VALUES(%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s) ON CONFLICT(col2) DO UPDATE SET (col1,col2,col3,col4,col5,col6,col7,col8,col9,.

问题 I understand that when using INSERT ... ON DUPLICATE KEY UPDATE in MySQL there are auto increment gaps when an insert fails. However -- I've noticed that the gaps only occur when a unique key constraint is violated. If the primary key constraint fails, no auto increment gap occurs. What's the reason for the difference between the two? Thanks! 回答1: If the auto increment field is the primary key, then duplication in the primary key can only happen if you explicitly set the auto increment field

问题 I have this query that is executed in my Python script but when its inserting into the database and finds a duplicate of my unique column it causes it to error and stops. I know I need to use On Duplicate Key Update but I'm note sure how to properly add this. My unique column 2. cur.execute("""INSERT INTO logs (1,2,3) VALUES (%s,%s,%s) """,(line[0], line[1], line[2])) If there is a duplicate to have it update that row/entry. 回答1: When I understand you correctly, what you are looking for is

问题 Can I safely update all values like this: INSERT INTO tbl_name SET `a`=:a, `b`=:b, ... `z`=:z ON DUPLICATE KEY UPDATE `a`=VALUES(`a`), `b`=VALUES(`b`), ... `z`=VALUES(`z`); I have tried it, and it works. But it's tested only on one innodb table. I have found these related questions 1, 2, 3 but there's no mention that updating ALL columns (unique and/or pk) is 100% safe. It doesn't create any error on updating PK with same value. It doesn't create any error on updating Unique col with same

问题 I am executing SQL (MySQL) commands from PHP. There are several possible outcomes to each execution: Record updated to new value Record updated, but values happen to be the same Record finds no rows to update (ie, no rows match the WHERE clause) I am wondering how to differentiate between #'s 1 and 3: both cases return zero as the number of rows being affected, so: $result = $db->exec($statement) will have $result == 0 in both cases. How can I tell the difference? EDIT: I meant to ask how to

问题 I am trying to update on duplicate record in MySQL, I have a table with many column but i want to update only some column from another table with same desc as current table but it is not updating records. my query is: insert into backup_prochart.symbol_list(ticker,end_date,cur_date) select ticker,t.end_date,t.cur_date from prochart.symbol_list t where ticker=t.ticker and ticker= 'MAY17' on duplicate key update end_date=t.end_date,cur_date=t.cur_date; another query i tried insert into backup

问题 i have a form data and the data's array like this: $datas=array("x-1","y-2","y-2","y-3","t-1"); my foreach loop: foreach($datas as $x => $data){ $data=explode("-",$data); if($data[0]==$data[0]+1){$n=1;}else{$n=0;} $keys[$x]=$data[0].$n++; $vals[$x]=$data[1]; } i couldn't write the true code, my 3rd line is wrong i think (if($data[0]=$data[0]+1){$n="1";}else{$n="";}) so, i wanna rename the duplicate keys by giving number. my output should be like this: x=1 y1=1 y2=2 y3=2 t1=1 回答1: Try $datas

问题 I want to implement a Viewed system for my website. Here is the structure of my tables: // table1 id | user_or_ip | post_id | date_time // inserting new row for each viewed // table2 id | post_id | total_viewed // getting the number of total viewed for each post Now I need to a trigger for insert/update table2 after insert in table1 . I think I have to use on duplicate key . 回答1: You can do this fairly easily. With the following 2 example table:- CREATE TABLE table1 ( id INT NOT NULL AUTO

问题 I know this problem has already been around but I cannot figure out how to solve it in my case. I try to use the UPDATE statement with sql but I have a problem when dealing with multiples rows. This is my code: $body = file_get_contents('php://input'); $jsonArray = json_decode($body, true); $sql = array(); foreach ($jsonArray as $row) { $sql[] = '("'.$row['firstname'].'", "'.$row['lastname'].'", "'.$row['sex'].'", "'.$row['dateOfBirth'].'", "'.$row['email'].'")'; } $column_name = "(firstname,

问题 I have below MySQL insert statement which I want to update all the fields(except for the primary key) if a record exists. Because there are up to 80 columns, I don't want to write the key and value pairs one by one. Could anyone help on this? Below is my code: # Save item to database def process_item(self, item, _): with self.conn.cursor() as c: c.execute(self.query(item), item.values()) def query(self, item): return "INSERT INTO income_statement ({columns}) VALUES ({values}) ON DUPLICATE KEY