In Postgres, is it possible to execute a .sql file from a query or function: Postgres, 8.2

In Postgres, is it possible to execute a .sql file from a query or function

Asked by: sl311

A third party program generates a .sql script in a file which I would like to run.

In my Java app, I already have a connection in a connection pool to the database, and I'd like to use that to run the .sql script in the file by simply calling a query or function.

The alternative is to run it through the command line, which I can do, but it means passing through the DB username and password which seems less secure than just reusing the same connection. I run on a mixture of Windows and Linux too, so if I can just run a postgres query / function that can run a .sql file (which resides on the same server as postgres itself) then that would seem to me to be the best solution.

All my searching so far has not revealed a solution (although no one has said it's not possible either)

Any ideas appreciated.

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Hi,

Another way would be to just open the file in Java,
put only the string from start to ";" into a variable and send that.
Then put the string from ";"+1 to the next ";" into the variable and
send that. Repeat until you reach the end of the file.

This way you don't load 15MB into java which will quite blow the memory
consumption up.

Depending on how the generated file looks like you might just use
readLine(). The second variant below uses this strategy.

Cheers,
za-k/

// first variant, with read() each char
try
{
 BufferedReader in = new BufferedReader(new FileReader("gnerated.sql"));
 String sqlCommand = ""; int ch;
 while((ch = in.read()) != EOF)
 {
   if (ch != ';') /* accumulate if not ';' */
   { 
      sqlCommand = sqlCommand + (char)ch; 
   }
   else /* found the end of the statement: ';'*/
   { 
      sqlCommand = sqlCommand + (char)ch;
      // send the SQL command to the server
      ResultSet uprs = stmt.executeQuery(sqlCommand);
      // make the command emty again to accumulate the next command
      sqlCommand = "";
   }    
 }
 in.close();
}
catch(IOException e)
{
   System.err.println("Something fishy happened" + e.getMessage());
   in.close();
}
catch(JDBCException ex)
{
   System.err.println("Something fishy happened while sending the SQL to the db" + ex.getMessage());
   in.close();
}
 
 
// second variant, with readLine() IF EACH SQL COMMAND IN THE FILE ENDS where the line ends
try
{
 BufferedReader in = new BufferedReader(new FileReader("gnerated.sql"));
 String sqlCommand = ""; 
 while((sqlCommand = in.readLine()) != null)
 {
    // send the SQL command to the server
    ResultSet uprs = stmt.executeQuery(sqlCommand);
 }
 in.close();
}
catch(IOException e)
{
   System.err.println("Something fishy happened" + e.getMessage());
   in.close();
}
catch(JDBCException ex)
{
   System.err.println("Something fishy happened while sending the SQL to the db" + ex.getMessage());
   in.close();
}

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In Postgres, is it possible to execute a .sql file from a query or function

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