i'm using node.js to build a web. I connect to my database (Mysql) and
get the data then return to the client side.
I know that i can use the literal template to write my sql expression like below
promise(`SELECT table.name FROM table WHERE name = ?`,[parameter])
and i'm would like to know can i write my sql expression like this?
promise(`SELECT table.? FROM table`,[parameter])
I know the result is different, i just want to know it is right or not.
thank you and have a nice day.
No, but you could use string interpolation like:
promise(`SELECT table.name FROM table WHERE name = ${parameter}`)
Related
i have a project to show database value...
but, the database name has dot in it.
my database name is "t.produk".
How can i select the database in laravel?
i run it and got an error says it invalid like below
EDIT:
and i also did it with just string, came out error too :
Here the picture
First of all - avoid naming database tables like that. You should not use any dots there. It could be t_produk as example.
But table name should be descriptive so go for something like products. Than name your entity as Product.
You get this error here because you can't set variable as (t.produk). You should pass a string as I see here. So do it like this:
protected $table = 't.produk';
EDIT:
I saw the error with a string variable. So now you see why the current table naming you choose is quite not good. DB reads it as follows:
select from database t table produk
If you will name your table like t_produk problem should be no longer here.
My bad, so the tables name can't have dot in it. noted.
Btw y'all thanks for the answers :)
I have a odd situation where I would like to phrase a variable inside an SQL string. Basically ODBC will return a query with a string, in that string there will be an Asterisk variable and I need that phrased and passed back to SQL. For example (pointless code but showing the example)-
exten => s,n,Set(QUERY=${ODBC_GET_QUERY(${EXTEN})})
The SQL query in func_odbc.conf is SELECT query FROM tablea WHERE number = ${ARG1}
Now QUERY will look like to = ${DIALED}, ${DIALED} being a asterisk variable (I will make it 17005551212 for example) I need that phrased so I end up with -
exten => s,n,Set(ALLOWED=${ODBC_GET_ALLOWED(${QUERY})})
The SQL query in func_odbc.conf would be SELECT allowed FROM tableb WHERE ${ARG1} so the SQL query would resolve to SELECT allowed WHERE to = 17005551212.
Before I dive into this and re-invent the wheel, is it possible or even allowed? I have actually not tried it yet. I know in a Set() statement it will phrase a variable inline, but is there a way to phrase variable that is in a variable when its returned via ODBC? Thanks!
Please read carefully source code.
Func odbc use prepair call. So it will not work for your example just becuase prepair do not allow do that.
In general you can substitute variables. Example 1 WILL work ok.
Workaround - use mysql EXEC.
I am working on a problem where I need to add an OR clause to a set of existing conditions. The current conditions are built in a hash in a method and at the end, they are used in the where clause. Here is a simplified example:
...
conds.merge!({:users => {:archived => false}})
Model.where(conds)
I am trying to add an OR clause to the current set of conditions so it would be something like '(conditions) OR new_condition'. I'd like to add the OR statement without converting each addition to the conds hash into a string. That would be my last option. I was hoping someone has done something like this before (without using Arel). I seem to recall in Rails 2 there was a way to parse a conditions hash using a method from the model (something like Model.some_method(conds) would produce the where clause string. Maybe that would be a good option to just add the OR clause on to that string. Any ideas are appreciated. Thank you for your help!
I found a way to do what I needed. Instead of changing all of the conditions that I am building, I am parsing the conditions to SQL using sanitize_sql_for_conditions. This is a private method in ActiveRecord, so I had to put a method on the model to allow me to access it. Here is my model method:
def self.convert_conditions_hash_to_sql(conditions)
self.sanitize_sql_for_conditions(conditions)
end
So, once I convert my conditions to text, I can add my OR clause (along with the appropriate parentheses) to the end of the original conditions. So, it would go something like this:
Model.where('(?) OR (model.type = ? AND model.id IN(?))', Model.convert_conditions_hash_to_sql(conds), model_type, model_id_array)
This may be a futile question, but I will ask anyway. I have now learned that it is bad practice to use a question mark at the end of a field name, as is the case with the Paid? field in the following statement:
$sql = "INSERT INTO `tblAppeals`
(
`#`,
`Year`,
`Property#`,
`Paid?`,
`Outcome`,
`ResolvedBy`,
`AppealCategory`
)
VALUES (?,?,?,?,?,?,?)";
When I try to run the statement, I get an error because the question mark is not handled correctly. I haven't been able to find any workarounds to avoid having to go back and change the field name.
Is there any way I can keep the field name the same, Paid?, and still use it in the INSERT statement? Thanks.
It looks like its an issue with your query layer and not MySQL itself. That is, whatever is doing the bind params handling is eagerly looking for all ? in the SQL and not just whats in the VALUES part of the clause.
What database drive / query framework are you using?
I'm using Rails 3 with a MySQL database, and I need to programmatically create a query like this:
select * from table where category_name like '%category_name_1%'
OR category_name like '%category_name_2%'
(...snip...)
OR category_name like '%category_name_n%'
Given the table size and the project scope (500 rows at most, I think), I feel that using something like thinking sphinx would be overkill.
I know I could simply do this by writing the query string directly, but wanted to know if there's an ActiveRecord way to do this. There's no mention of this on the official guide, and I've been googling for a long while now, just to end empty-handed :(
Also, is there a reason (maybe a Rails reason?) to not to include the OR clause?
Thanks!
Assuming you have an array names with category names:
Model.where( names.map{"category_name LIKE ?"}.join(" OR "),
*names.map{|n| "%#{n}%" } )
you should google first, there is already an answer.
Look here and then here
and you'll get something like this:
accounts = Account.arel_table
Account.where(accounts[:name].matches("%#{user_name}%").or(accounts[:name].matches("%#{user_name2}%")))
If you look at the guide, they have examples that can easily be modified to this:
Client.where("orders_count = ? OR locked = ?", params[:orders], false)
Mysql has a regexp function now that can clean things up a bit, assuming there's no regex metachars in your category names:
Table.where "category_name regexp '#{names.join('|')}'"