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Posts Tagged ‘sql server’

Implement pagination with SQL Server 2005

January 9th, 2007

With the new row_number() feature of the MS SQL Server 2005, now it’s very easy to implement pagination: get data rows page by page to avoid the retrieve too much data at same time. The new feature it’s very similar to the Oracle ROWUM.
The prepare statement could be like the follow:

  1. SELECT * FROM ( SELECT row_number() OVER (ORDER BY id) AS resultNum, id FROM table_name) AS numberResultsWHERE resultNum  BETWEEN ? AND ?

More information here.

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Retrieving identity column values from MS SQL Server by JDBC

January 3rd, 2007

Retrieving identity column values in JDBC applications:

You define an identity column in a CREATE TABLE by specifying the IDENTITY clause when you define a column.
This feature is defined in the JDBC, and implmented in the MS Sql Server 2005, not in the older version. For Oracle database this is not implemented, but the common solution of the rownum can be used instead.

1.Set the prepared statement to get the identity column from DB:

  1. Connection.prepareStatement(sql-statement,
  2. Statement.RETURN_GENERATED_KEYS);

or

  1. Statement.executeUpdate(sql-statement, Statement.RETURN_GENERATED_KEYS);

2. Get the generated values from the statement

  1. rs = stmt.getGeneratedKeys();
  2. while (rs.next()) {
  3. rs.getBigDecimal(1);
  4. }

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