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

Artifact bb63749fa8a395a60541100607d86381604b7194:


# 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 tests creating and dropping triggers, and interaction thereof
# with the database COMMIT/ROLLBACK logic.
#
# 1. CREATE and DROP TRIGGER tests
# trig-1.1: Error if table does not exist
# trig-1.2: Error if trigger already exists
# trig-1.3: Created triggers are deleted if the transaction is rolled back
# trig-1.4: DROP TRIGGER removes trigger
# trig-1.5: Dropped triggers are restored if the transaction is rolled back
# trig-1.6: Error if dropped trigger doesn't exist
# trig-1.7: Dropping the table automatically drops all triggers
# trig-1.8: A trigger created on a TEMP table is not inserted into sqlite_master
# trig-1.9: Ensure that we cannot create a trigger on sqlite_master
# trig-1.10:
# trig-1.11:
# trig-1.12: Ensure that INSTEAD OF triggers cannot be created on tables
# trig-1.13: Ensure that AFTER triggers cannot be created on views
# trig-1.14: Ensure that BEFORE triggers cannot be created on views
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl

do_test trig_cd-1.1 {
   catchsql {
     CREATE TRIGGER trig UPDATE ON no_such_table BEGIN
       SELECT * from sqlite_master;
     END;
   } 
} {1 {no such table: no_such_table}}

execsql {
    CREATE TABLE t1(a);
}
execsql {
	CREATE TRIGGER tr1 INSERT ON t1 BEGIN
	  INSERT INTO t1 values(1);
 	END;
}
do_test trig_cd-1.2 {
    catchsql {
	CREATE TRIGGER tr1 DELETE ON t1 BEGIN
	    SELECT * FROM sqlite_master;
 	END
     }
} {1 {trigger tr1 already exists}}

do_test trig_cd-1.3 {
    catchsql {
	BEGIN;
	CREATE TRIGGER tr2 INSERT ON t1 BEGIN
	    SELECT * from sqlite_master; END;
        ROLLBACK;
	CREATE TRIGGER tr2 INSERT ON t1 BEGIN
	    SELECT * from sqlite_master; END;
    }
} {0 {}}

do_test trig_cd-1.4 {
    catchsql {
	DROP TRIGGER tr1;
	CREATE TRIGGER tr1 DELETE ON t1 BEGIN
	    SELECT * FROM sqlite_master;
	END
    }
} {0 {}}

do_test trig_cd-1.5 {
    execsql {
	BEGIN;
	DROP TRIGGER tr2;
	ROLLBACK;
	DROP TRIGGER tr2;
    }
} {}

do_test trig_cd-1.6 {
    catchsql {
	DROP TRIGGER biggles;
    }
} {1 {no such trigger: biggles}}

do_test trig_cd-1.7 {
    catchsql {
	DROP TABLE t1;
	DROP TRIGGER tr1;
    }
} {1 {no such trigger: tr1}}

execsql {
  CREATE TEMP TABLE temp_table(a);
}
do_test trig_cd-1.8 {
  execsql {
	CREATE TRIGGER temp_trig UPDATE ON temp_table BEGIN
	    SELECT * from sqlite_master;
	END;
	SELECT count(*) FROM sqlite_master WHERE name = 'temp_trig';
  } 
} {0}

do_test trig_cd-1.9 {
  catchsql {
    CREATE TRIGGER tr1 AFTER UPDATE ON sqlite_master BEGIN
       SELECT * FROM sqlite_master;
    END;
  }
} {1 {cannot create trigger on system table: sqlite_master}}

# Check to make sure that a DELETE statement within the body of
# a trigger does not mess up the DELETE that caused the trigger to
# run in the first place.
#
do_test trig_cd-1.10 {
  execsql {
    create table t1(a,b);
    insert into t1 values(1,'a');
    insert into t1 values(2,'b');
    insert into t1 values(3,'c');
    insert into t1 values(4,'d');
    create trigger r1 after delete on t1 for each row begin
      delete from t1 WHERE a=old.a+2;
    end;
    delete from t1 where a in (1,3);
    select * from t1;
    drop table t1;
  }
} {2 b 4 d}
do_test trig_cd-1.11 {
  execsql {
    create table t1(a,b);
    insert into t1 values(1,'a');
    insert into t1 values(2,'b');
    insert into t1 values(3,'c');
    insert into t1 values(4,'d');
    create trigger r1 after update on t1 for each row begin
      delete from t1 WHERE a=old.a+2;
    end;
    update t1 set b='x-' || b where a in (1,3);
    select * from t1;
    drop table t1;
  }
} {1 x-a 2 b 4 d}

# Ensure that we cannot create INSTEAD OF triggers on tables
do_test trig_cd-1.12 {
  catchsql {
    create table t1(a,b);
    create trigger t1t instead of update on t1 for each row begin
      delete from t1 WHERE a=old.a+2;
    end;
  }
} {1 {cannot create INSTEAD OF trigger on table: t1}}
# Ensure that we cannot create BEFORE triggers on views
do_test trig_cd-1.13 {
  catchsql {
    create view v1 as select * from t1;
    create trigger v1t before update on v1 for each row begin
      delete from t1 WHERE a=old.a+2;
    end;
  }
} {1 {cannot create BEFORE trigger on view: v1}}
# Ensure that we cannot create AFTER triggers on views
do_test trig_cd-1.14 {
  catchsql {
    create table t1(a,b);
    create view v1 as select * from t1;
    create trigger v1t AFTER update on v1 for each row begin
      delete from t1 WHERE a=old.a+2;
    end;
  }
} {1 {cannot create AFTER trigger on view: v1}}

finish_test