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Viewing changes to drizzled/sql_parse.cc

Updates based on code review from Jay.

- modified the SqlCommand base class to be abstract
- created new directory (command) where each command implementation will be
  placed in a separate file
- created namespace for various commands (drizzled::command)

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drizzled/sql_parse.cc
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#include <drizzled/connect.h>
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#include <drizzled/lock.h>
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#include <drizzled/select_send.h>
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#include <drizzled/sql_commands.h>
 
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#include <drizzled/command.h>
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#include <bitset>
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#include <algorithm>
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   */
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  if (comm_not_executed)
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  {
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    /*
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     * Add needed information to the command object that will
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     * be executed. Since we do not know until runtime what the
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     * type of command to be executed is, we add this information
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     * to every command even though it may not need or use it.
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     */
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    lex->command->setShowLock(&LOCK_status);
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    lex->command->setTableList(all_tables);
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    lex->command->setFirstTable(first_table);
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    lex->command->setNeedStartWaiting(&need_start_waiting);
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    /* now we are ready to execute the command */
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    res= lex->command->execute();
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  }