I'm using sqljocky to insert data into a MySQL database. I need to truncate a table first, then insert multiple rows in it. I would do this in a single transaction, but it seems that sqljocky doesn't support this at all now (or maybe I'm quite new in dart and sqljocky).
The solution I found is the following, but I was wondering if there's a better one.
// Start transaction
pool.query('START TRANSACTION').then((r) {
// Truncate table
pool.query('TRUNCATE myTable').then((r) {
// Prepare statement to insert new data
pool.prepare('REPLACE INTO myTable (Id, Name, Description) VALUES (?,?,?)').then((query) {
// Execute query inserting multiple rows
query.executeMulti(myArrayValues).then((results) {
// Other stuff here
pool.query('COMMIT').then((r) {
...
To be honest, I'm still wondering if this code really executes a transactioned query!
Here's the same code rewritten with transaction support:
// Start transaction
pool.startTransaction().then((trans) {
// Delete all from table
trans.query('DELETE FROM myTable WHERE 1=1').then((r) {
// Prepare statement
trans.prepare('REPLACE INTO myTable (Id, Name, Description) VALUES (?,?,?)').then((query) {
// Execute query inserting multiple rows
query.executeMulti(myArrayValues).then((results) {
// Stuff here
// Commit
trans.commit().then((r) { ...
Use ConectionPool.startTransaction().
* You
* must use this method rather than `query('start transaction')` otherwise
* subsequent queries may get executed on other connections which are not
* in the transaction.
Haven't tried it myself yet.
Related
background:
sprintboot + mysql5.7 + mybatis
repeatable read
i thought i can select the data which insert in one transcation.but the answer is no.
#Transactionnal
public void test(){
dao.insert();//insert data
dao.select();//select data insert previous row.but can't find
}
i tried command in mysql client, like this :
start transaction;
insert into ....
select * from ....
commit;
and the data insert can be found in select after insert;
i really can't understand why .
I have made an application in Nodejs that every minute calls an endpoint and gets a json array that has about 100000 elements. I need to upsert this elements into my database such that if the element doesn't exist I insert it with column "Point" value set to 0.
So far I'm having a cron job and simple upsert query. But it's so slow:
var q = async.queue(function (data, done) {
db.query('INSERT INTO stat(`user`, `user2`, `point`) '+data.values+' ON DUPLICATE KEY UPDATE point=point+ 10',function (err, result) {
if (err) throw err;
});
},100000);
//Cron job here Every 1 minute execute the lines below:
var values='' ;
for (var v=0;v<stats.length;v++) {
values = '("JACK","' + stats[v] + '", 0)';
q.push({values: values});
}
How can I do such a task in a very short amount of time. Is using mysql a wrong decision? I'm open to any other architecture or solution. Note that I have to do this every minute.
I fixed this problem by using Bulk Upsert (from documentation)! I managed to Upsert over 24k rows in less than 3 seconds. Basically created the query first then ran it:
INSERT INTO table (a,b,c) VALUES (1,2,3),(4,5,6)
ON DUPLICATE KEY UPDATE c=VALUES(a)+VALUES(b);
I am having trouble finding the correct syntax to execute multiple MySQL statements at once, like with cftransaction. I'm trying to implement this in a CFC in pure cfscript.
<cftransaction>
DROP TABLE IF EXISTS SOME_TEMP_TBL;
CREATE TABLE SOME_TEMP_TBL AS
(
SELECT * FROM ANOTHER_TBL
);
DROP TABLE IF EXISTS SOME_TEMP_TBL_2;
CREATE TABLE SOME_TEMP_TBL_2 AS
(
SELECT * FROM ANOTHER_TBL_2
);
</cftransaction>
So I have the SQL statements chained together as a string:
var SQL = "
DROP TABLE IF EXISTS SOME_TEMP_TBL;
CREATE TABLE SOME_TEMP_TBL AS
(
SELECT * FROM ANOTHER_TBL
);
DROP TABLE IF EXISTS SOME_TEMP_TBL_2;
CREATE TABLE SOME_TEMP_TBL_2 AS
(
SELECT * FROM ANOTHER_TBL_2
);
";
And if I understand right I think I need to use a transaction {} block. But do I put raw MySQL code in there? Currently I'm trying to attach it to a Query object but Base.cfc (Railo) is throwing an error saying the datasource isn't defined.
transaction
{
qTrans = new Query();
qTrans.setSQL(SQL);
qTrans.execute();
qTrans.setDatasource(variables.instance.datasource.getDSN());
if (good)
{
transaction action="commit";
} else {
transaction action="rollback";
}
}
Have also tried just SQL.execute() but of course execute() isn't defined for a string & it wouldn't relate to any DB anyway...
Also, is the if(good) portion required? By default does if(good) test for whether or not a MySQL error occurred? And is transaction action="commit" what actually sends the SQL script?
Do I need to split these up into separate Query objects and run them sequentially? And if so what's the point of even having the transaction block in CFscript?
I know I'm way off here but I'm having a hard time navigating the CF documentation around this. If anyone knows of a good source specifically for CFscript references I could really use one, because I struggle with Adobe's version.
Try this code
try {
transaction {
qTrans = new Query();
qTrans.setDatasource(variables.instance.datasource.getDSN());
qTrans.setSQL(SQL);
qryRes = qTrans.execute();
TransactionCommit();
}
} catch(database e) {
TransactionRollback();
}
I have constructed a function where two queries are performed. Both of these queries insert data into two separate tables, data that is related to the registration of a user.
In one table things like username,password are held and in the other table stuff like address, phone etc...
Here is the function:
function register_biz_user($post,$connection)
{
$name=$connection-> real_escape_string($_POST['name']);
$lastname= $connection->real_escape_string($_POST['lastname']);
$pass_hashed = password::hash($_POST['password']);
$passwd= $connection->real_escape_string($pass_hashed);
$buztype= $connection->real_escape_string($_POST['buztype']);
$usertype= $connection->real_escape_string($_POST['usertype']);
$address= $connection->real_escape_string($_POST['address']);
$city= $connection->real_escape_string($_POST['city']);
$municipality= $connection->real_escape_string($_POST['municipality']);
$url= $connection->real_escape_string($_POST['wwwaddress']);
$email= $connection->real_escape_string($_POST['e-mail']);
$phone= $connection->real_escape_string($_POST['phone']);
$hash =$connection->real_escape_string(md5( rand(0,1000) )) ;
$connection->set_charset("utf8");
$result1 = $connection->query("insert into users values
(NULL,'" .$name. "','" .$lastname . "','".$email."','". $passwd."','".
$hash."','". $usertype."')");
if (!$result1) {
throw new Exception('error');
return false;
}
else{$result2=$connection->query("insert into business_users values
('".$connection->insert_id."','" .$address."','".$url ."','".$phone.
"','".$city. "','".$municipality. "','".$buztype. "')");
}
if(!$result2)
{ throw new Exception('error');
return false;}
return true;
}
And here is my problem:
If you look at the code you might notice that there is the problem that the 1st query runs without problem and the second throws an exception or vice verca.
My point is that there is the danger that the db WILL have ONLY partial data of the registered user. The goal is that either both queries run successfully or none runs.
How I must write the above code such that I can achieve the above statement?
I hope I was clear enough.
Use transactions: http://dev.mysql.com/doc/refman/5.0/en/commit.html
BEGIN
... queries ...
COMMIT or ROLLBACK
Note: "or vice verca" - that's not possible. In that case the 2nd query never gets executed.
Note2:
what's $post? seems to be unused.
why don't you use prepared statements? escaping everyhing is very error prone.
why do you have a procedural interface, passing $connection? you should have objects which know about the database connections... you have mixed code for at least 3 different layers... not necessary bad if you plan to create write-once-get-rid-of-code but probably not a good idea for a project which you have to maintain for months/years.
How do I do error checking, in my model? For instance if my procedure adds a record I want to return true if not I want to return false. Do I need to do a count on the records in the table before and after the procedure then compare them which is the best way to do this?
function add_student($SECTION_ID, $STUDENT_ID)
{
$this->db->query("call add_student('$SECTION_ID','$STUDENT_ID')");
}
function drop_student($SECTION_ID, $STUDENT_ID)
{
$this->db->query("call drop_student('$SECTION_ID','$STUDENT_ID')");
}
Looks like your database is mysql
Use FOUND_ROWS( ) to find rows affected after executing the select statement in the procedure
Or You could use ROW_COUNT() function to find the number of records after insert statement