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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

Artifact 09608d81c63a6ff3aaf7bc70717909c51f5f4048:


# 2009 August 1
#
# 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.
#
#***********************************************************************
#
# Tests to make sure #3810 is fixed.
#
# $Id: tkt3810.test,v 1.4 2009/08/06 17:43:31 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable {!trigger} {
  finish_test
  return
}

# Create a table using the first database connection.
#
do_test tkt3810-1.1 {
  execsql {
    CREATE TABLE t1(x);
    INSERT INTO t1 VALUES(123);
    SELECT * FROM t1;
    CREATE TABLE t2(y);
    CREATE TABLE t3(z);
  }
} 123

# Create a second connection to the same database.  Make sure the
# schema of the database has been parsed by the second connection.
#
do_test tkt3810-2 {
  sqlite3 db2 test.db
  execsql {
    SELECT * FROM t1;
  } db2
} 123

# DROP the table using the second connection.  The table no longer exists
# but the first connection does not yet know this.  Then try to create a TEMP
# trigger in the first connection that references the table that was dropped.
#
do_test tkt3810-3 {
  execsql {DROP TABLE t1} db2
  execsql {
     CREATE TEMP TRIGGER r1 AFTER INSERT ON t1 BEGIN
       INSERT INTO t2 VALUES(new.rowid);
     END;
  }
  catchsql {
    SELECT * FROM t3;
  }
} {0 {}}

# Trigger still exists in the sqlite_temp_master table, but now it is
# an orphan.
#
do_test tkt3810-4 {
  execsql {SELECT name FROM temp.sqlite_master ORDER BY name}
} {r1}

# Because it is an orphan, it cannot be dropped.
#
do_test tkt3810-5 {
  catchsql {DROP TRIGGER r1}
} {1 {no such trigger: r1}}

# Create a table t1 then drop the table in order to drop the orphaned
# trigger.
#
do_test tkt3810-6 {
  execsql {CREATE TABLE t1(x)} db2
  execsql {DROP TABLE t1}
  execsql {
    SELECT name FROM sqlite_temp_master;
  }
} {}

db2 close

finish_test