Some examples of tcl and sqlite usage:

NOTE: the name of the database is opendb

   * Retrieve the names of the tables stored in a sqlite database:

======
   set tableNames [opendb eval {SELECT tbl_name FROM sqlite_master}]
   puts $tableNames
======


   * Retrieve the names of the columns stored in a sqlite database(variable columnName):
====== 
   opendb eval "SELECT * FROM $tableName LIMIT 1" x {set columnName $x(*)} 
   puts $columnName
======

[jnc] You can also use the `PRAGMA` statement `table_info(table_name`) to retrieve column information. See http://sqlite.org/pragma.html for a list of all `PRAGMA` statements.

====== 
   set columns [opendb eval "PRAGMA table_info($tableName)"]
   puts $columns
======

   * Retrieve the row data from a table
======
   opendb eval "Select * FROM $i" values {
      set columnNames $values(*)
      foreach column $columnNames {
         set rowList $values($column)
      }
      puts $rowValues
   }
======

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