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From "Thomas Fischer (JIRA)" <j...@apache.org>
Subject [jira] Created: (TORQUE-16) LockTables is faulty in some adapters
Date Mon, 01 May 2006 17:10:46 GMT
 LockTables is faulty in some adapters
--------------------------------------

         Key: TORQUE-16
         URL: http://issues.apache.org/jira/browse/TORQUE-16
     Project: Torque
        Type: Bug

  Components: Runtime  
    Versions: 3.2, 3.1.1, 3.1    
 Environment: mssql, oracle
    Reporter: Thomas Fischer


Sent to me from Michael Beier

in some adapters (e.g mssql, sybase) lockTables is implemented as follows:

public void lockTable(Connection con, String table) throws SQLException
{
    Statement statement = con.createStatement();
 
    stmt.append("SELECT next_id FROM ")
        .append(table)
        .append(" FOR UPDATE");
}
 
Problem is that the column next_id does not exist in most tables.
Suggested is to replace this as follows:
Mssql:
{
    Statement statement = con.createStatement();
 
    StringBuffer stmt = new StringBuffer();
    stmt.append("SELECT * FROM ")
  .append(table)
  .append(" WITH (TABLOCKX)");
 
    statement.executeQuery(stmt.toString());
}

Oracle:
public void lockTable(Connection con, String table) throws SQLException
{
    Statement statement = con.createStatement();
 
    StringBuffer stmt = new StringBuffer();
    stmt.append("SELECT * FROM ")
        .append(table)
        .append(" FOR UPDATE");
 
    statement.executeQuery(stmt.toString());
}

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