# 2010 Jun 28
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
 
set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/malloc_common.tcl
source $testdir/lock_common.tcl
 
# This block tests that if one client modifies the database schema, a
# second client updates its internal cache of the database schema before
# executing any queries. Specifically, it does not return a "no such column"
# or "no such table" error if the table or column in question does exist
# but was added after the second client loaded its cache of the database
# schema.
#
# Types of schema modifications:
#
#   1. Adding a database table.
#   2. Adding a database view.
#   3. Adding a database index.
#   4. Adding a database trigger.
#   5. Adding a column to an existing table (ALTER TABLE).
#
do_multiclient_test tn {
 
  # Have connections [db1] and [db2] load the current database schema.
  #
  sql1 { SELECT * FROM sqlite_master }
  sql2 { SELECT * FROM sqlite_master }
 
  foreach {tn2 c1 c2} {
    1  { CREATE TABLE t1(a, b) }       { SELECT * FROM t1            }
    2  { CREATE TABLE t2(a, b) }       { UPDATE t2 SET a = b         }
    3  { CREATE TABLE t3(a, b) }       { DELETE FROM t3              }
    4  { CREATE TABLE t4(a, b) }       { INSERT INTO t4 VALUES(1, 2) }
    5  { CREATE TABLE t5(a, b) }       { DROP TABLE t5 }
    6  { CREATE TABLE t6(a, b) }       { CREATE INDEX i1 ON t6(a) }
 
    7  { ALTER TABLE t1 ADD COLUMN c } { SELECT a, b, c FROM t1 }
    8  { ALTER TABLE t2 ADD COLUMN c } { UPDATE t2 SET a = c }
    9  { ALTER TABLE t2 ADD COLUMN d } { UPDATE t2 SET d = c }
    10 { ALTER TABLE t3 ADD COLUMN c } { DELETE FROM t3 WHERE c>10 }
    11 { ALTER TABLE t4 ADD COLUMN c } { INSERT INTO t4(a,b,c) VALUES(1,2,3) }
    12 { ALTER TABLE t6 ADD COLUMN c } { CREATE INDEX i2 ON t6(c) }
    13 { ALTER TABLE t6 ADD COLUMN d } { 
         CREATE TRIGGER tr1 AFTER UPDATE OF d ON t6 BEGIN
           SELECT 1, 2, 3;
         END;
    }
 
    14 { CREATE INDEX i3 ON t1(a) }    { DROP INDEX i3 }
    15 { CREATE INDEX i4 ON t2(a) }    {
         SELECT * FROM t2 INDEXED BY i4 ORDER BY a
    }
 
    16 { CREATE TRIGGER tr2 AFTER INSERT ON t3 BEGIN SELECT 1 ; END } {
         DROP TRIGGER tr2
    }
 
    17  { CREATE VIEW v1 AS SELECT * FROM t1 } { SELECT a,b,c   FROM v1 }
    18  { ALTER TABLE t1 ADD COLUMN d        } { SELECT a,b,c,d FROM v1 }
    19  { CREATE TABLE t7(a, b) } {
          DROP TABLE IF EXISTS t7; CREATE TABLE t7(c, d);
    }
    20  { CREATE INDEX i5 ON t7(c, d) } {
          DROP INDEX IF EXISTS i5; CREATE INDEX i5 ON t7(c)
    }
    21  { CREATE TRIGGER tr3 BEFORE DELETE ON t7 BEGIN SELECT 1, 2, 3 ; END } {
          DROP TRIGGER IF EXISTS tr3;
          CREATE TRIGGER tr3 AFTER INSERT ON t7 BEGIN SELECT 1, 2, 3 ; END 
    }
 
    22  { CREATE TABLE t8(a, b) }       {
         CREATE TRIGGER tr4 AFTER UPDATE OF a ON t8 BEGIN
           SELECT 1, 2, 3;
         END;
    }
  } {
    do_test schema3-1.$tn.$tn2 {
      sql1 $c1
      sql2 $c2
    } {}
  }
}
 
finish_test