I need help understanding how to create proper indexing on a table for fast range selects. I have a table with the following columns: Column — Type frameidx — int u — int v — int x — float(53) y — float(53) z — float(53) None of these columns is unique. There are to b…
Disable SQL detection in JetBrains PyCharm
I was trying to type the following line: self._label = QtGui.QLabel(“Select parameter from selected category”) And PyCharm decided I was doing an SQL Query or something and gave errors about having …
NVarChar to C# Data Types
The database stores nvarchar, I retrieve the information and I’d like to jam it into C# data types without any declarative conversion code. Can you implicitly convert nvarchar to C# data types? (e.g. nvarchar to int) Answer Nvarchar is a string, if you want to turn it in to a int you will have to go thr…
Can’t insert Cyrillic symbols into MySQL with JDBC
I have a web app which uses com.mysql.jdbc.Driver to connect to MySQL database. Here are jdbcMySQL.properties: I create database like this: And the problem is: if I make then I have in my table BUT, if I make: I have in my table: Answer MySQL is a bit crazy w.r.t. encodings, try: Furthermore there is one more…
Text was truncated or one or more characters had no match in the target code page including the primary key in an unpivot
I’m trying to import a flat file into an oledb target sql server database. here’s the field that’s giving me trouble: here are the properties of that flat file connection, specifically the field: here’s the error message: [Source – 18942979103_txt [424]] Error: Data conversion fa…
How do you write a parameterized where-in raw sql query in Entity Framework
How do you write a parameterized where-in raw sql query in Entity Framework? I’ve tried the following: But as expected, it throws an error on DateParam because it’s expecting a single value. Answer This isn’t a problem specific to entity-framework, you can solve it by generating your own par…
Java – Can’t use ResultSet after connection close
I have a problem with closing a connection to MySQL. I’m getting the error: java.sql.SQLException: Operation not allowed after ResultSet closed My code: public static ResultSet sqlquery (String …
How to iterate over a record when the columns are dynamic
I have this function in postgres which takes PVH_COLS_DYNA that contains the columns that are going in to the query: CREATE OR REPLACE FUNCTION DRYNAMIC_DATA_F(PVH_COLS_DYNA VARCHAR) RETURNS numeric …
Delphi 7 Syntax error (comma) in ADO query
I’m trying to create a record in a database using a SQL query in Delphi 7. I’m using an ADO Query and I’ve tried both with and without parameters, but to no avail. The error occurs between ShowMessage 1 and 2. The commented out part was the one way I tried doing this, and it gave this error:…
how to use c# to insert a new record to chrome cookies file
I have find where chrome cookie file is, and I use sqliteBrowser open it and find cookies table’s structure. And I also successfully read cookies from this file,although the cookies value is …