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

Artifact 152aed5a1fa90709fe171f2ca501a6b7f7901479:


# 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
ifcapable {!trigger} {
  finish_test
  return
}

do_test trigger1-1.1.1 {
   catchsql {
     CREATE TRIGGER trig UPDATE ON no_such_table BEGIN
       SELECT * from sqlite_master;
     END;
   } 
} {1 {no such table: main.no_such_table}}

ifcapable tempdb {
  do_test trigger1-1.1.2 {
     catchsql {
       CREATE TEMP 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 trigger1-1.2 {
    catchsql {
	CREATE TRIGGER tr1 DELETE ON t1 BEGIN
	    SELECT * FROM sqlite_master;
 	END
     }
} {1 {trigger tr1 already exists}}

do_test trigger1-1.3 {
    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 trigger1-1.4 {
    catchsql {
	DROP TRIGGER tr1;
	CREATE TRIGGER tr1 DELETE ON t1 BEGIN
	    SELECT * FROM sqlite_master;
	END
    }
} {0 {}}

do_test trigger1-1.5 {
    execsql {
	BEGIN;
	DROP TRIGGER tr2;
	ROLLBACK;
	DROP TRIGGER tr2;
    }
} {}

do_test trigger1-1.6 {
    catchsql {
	DROP TRIGGER biggles;
    }
} {1 {no such trigger: biggles}}

do_test trigger1-1.7 {
    catchsql {
	DROP TABLE t1;
	DROP TRIGGER tr1;
    }
} {1 {no such trigger: tr1}}

ifcapable tempdb {
  execsql {
    CREATE TEMP TABLE temp_table(a);
  }
  do_test trigger1-1.8 {
    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 trigger1-1.9 {
  catchsql {
    CREATE TRIGGER tr1 AFTER UPDATE ON sqlite_master BEGIN
       SELECT * FROM sqlite_master;
    END;
  }
} {1 {cannot create trigger on system table}}

# 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 trigger1-1.10 {
  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=1 OR a=3;
    select * from t1;
    drop table t1;
  }
} {2 b 4 d}

do_test trigger1-1.11 {
  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=1 OR a=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 trigger1-1.12 {
  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: main.t1}}

ifcapable view {
# Ensure that we cannot create BEFORE triggers on views
do_test trigger1-1.13 {
  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: main.v1}}
# Ensure that we cannot create AFTER triggers on views
do_test trigger1-1.14 {
  catchsql {
    drop view v1;
    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: main.v1}}
} ;# ifcapable view

# Check for memory leaks in the trigger parser
#
do_test trigger1-2.1 {
  catchsql {
    CREATE TRIGGER r1 AFTER INSERT ON t1 BEGIN
      SELECT * FROM;  -- Syntax error
    END;
  }
} {1 {near ";": syntax error}}
do_test trigger1-2.2 {
  catchsql {
    CREATE TRIGGER r1 AFTER INSERT ON t1 BEGIN
      SELECT * FROM t1;
      SELECT * FROM;  -- Syntax error
    END;
  }
} {1 {near ";": syntax error}}

# Create a trigger that refers to a table that might not exist.
#
ifcapable tempdb {
  do_test trigger1-3.1 {
    execsql {
      CREATE TEMP TABLE t2(x,y);
    }
    catchsql {
      CREATE TRIGGER r1 AFTER INSERT ON t1 BEGIN
        INSERT INTO t2 VALUES(NEW.a,NEW.b);
      END;
    }
  } {0 {}}
  do_test trigger-3.2 {
    catchsql {
      INSERT INTO t1 VALUES(1,2);
      SELECT * FROM t2;
    }
  } {1 {no such table: main.t2}}
  do_test trigger-3.3 {
    db close
    set rc [catch {sqlite3 db test.db} err]
    if {$rc} {lappend rc $err}
    set rc
  } {0}
  do_test trigger-3.4 {
    catchsql {
      INSERT INTO t1 VALUES(1,2);
      SELECT * FROM t2;
    }
  } {1 {no such table: main.t2}}
  do_test trigger-3.5 {
    catchsql {
      CREATE TEMP TABLE t2(x,y);
      INSERT INTO t1 VALUES(1,2);
      SELECT * FROM t2;
    }
  } {1 {no such table: main.t2}}
  do_test trigger-3.6 {
    catchsql {
      DROP TRIGGER r1;
      CREATE TEMP TRIGGER r1 AFTER INSERT ON t1 BEGIN
        INSERT INTO t2 VALUES(NEW.a,NEW.b);
      END;
      INSERT INTO t1 VALUES(1,2);
      SELECT * FROM t2;
    }
  } {0 {1 2}}
  do_test trigger-3.7 {
    execsql {
      DROP TABLE t2;
      CREATE TABLE t2(x,y);
      SELECT * FROM t2;
    }
  } {}

  # There are two versions of trigger-3.8 and trigger-3.9. One that uses
  # compound SELECT statements, and another that does not.
  ifcapable compound {
  do_test trigger1-3.8 {
    execsql {
      INSERT INTO t1 VALUES(3,4);
      SELECT * FROM t1 UNION ALL SELECT * FROM t2;
    }
  } {1 2 3 4 3 4}
  do_test trigger1-3.9 {
    db close
    sqlite3 db test.db
    execsql {
      INSERT INTO t1 VALUES(5,6);
      SELECT * FROM t1 UNION ALL SELECT * FROM t2;
    }
  } {1 2 3 4 5 6 3 4}
  } ;# ifcapable compound
  ifcapable !compound {
  do_test trigger1-3.8 {
    execsql {
      INSERT INTO t1 VALUES(3,4);
      SELECT * FROM t1; 
      SELECT * FROM t2;
    }
  } {1 2 3 4 3 4}
  do_test trigger1-3.9 {
    db close
    sqlite3 db test.db
    execsql {
      INSERT INTO t1 VALUES(5,6);
      SELECT * FROM t1;
      SELECT * FROM t2;
    }
  } {1 2 3 4 5 6 3 4}
  } ;# ifcapable !compound

  do_test trigger1-4.1 {
    execsql {
      CREATE TEMP TRIGGER r1 BEFORE INSERT ON t1 BEGIN
        INSERT INTO t2 VALUES(NEW.a,NEW.b);
      END;
      INSERT INTO t1 VALUES(7,8);
      SELECT * FROM t2;
    }
  } {3 4 7 8}
  do_test trigger1-4.2 {
    sqlite3 db2 test.db
    execsql {
      INSERT INTO t1 VALUES(9,10);
    } db2;
    db2 close
    execsql {
      SELECT * FROM t2;
    }
  } {3 4 7 8}
  do_test trigger1-4.3 {
    execsql {
      DROP TABLE t1;
      SELECT * FROM t2;
    };
  } {3 4 7 8}
  do_test trigger1-4.4 {
    db close
    sqlite3 db test.db
    execsql {
      SELECT * FROM t2;
    };
  } {3 4 7 8}
} else {
  execsql {
    CREATE TABLE t2(x,y);
    DROP TABLE t1;
    INSERT INTO t2 VALUES(3, 4);
    INSERT INTO t2 VALUES(7, 8);
  }
}


integrity_check trigger1-5.1

# Create a trigger with the same name as a table.  Make sure the
# trigger works.  Then drop the trigger.  Make sure the table is
# still there.
#
set view_v1 {}
ifcapable view {
  set view_v1 {view v1}
}
do_test trigger1-6.1 {
  execsql {SELECT type, name FROM sqlite_master}
} [concat $view_v1 {table t2}]
do_test trigger1-6.2 {
  execsql {
    CREATE TRIGGER t2 BEFORE DELETE ON t2 BEGIN
      SELECT RAISE(ABORT,'deletes are not allows');
    END;
    SELECT type, name FROM sqlite_master;
  }
} [concat $view_v1 {table t2 trigger t2}]
do_test trigger1-6.3 {
  catchsql {DELETE FROM t2}
} {1 {deletes are not allows}}
do_test trigger1-6.4 {
  execsql {SELECT * FROM t2}
} {3 4 7 8}
do_test trigger1-6.5 {
  db close
  sqlite3 db test.db
  execsql {SELECT type, name FROM sqlite_master}
} [concat $view_v1 {table t2 trigger t2}]
do_test trigger1-6.6 {
  execsql {
    DROP TRIGGER t2;
    SELECT type, name FROM sqlite_master;
  }
} [concat $view_v1 {table t2}]
do_test trigger1-6.7 {
  execsql {SELECT * FROM t2}
} {3 4 7 8}
do_test trigger1-6.8 {
  db close
  sqlite3 db test.db
  execsql {SELECT * FROM t2}
} {3 4 7 8}

integrity_check trigger-7.1

# Check to make sure the name of a trigger can be quoted so that keywords
# can be used as trigger names.  Ticket #468
#
do_test trigger1-8.1 {
  execsql {
    CREATE TRIGGER 'trigger' AFTER INSERT ON t2 BEGIN SELECT 1; END;
    SELECT name FROM sqlite_master WHERE type='trigger';
  }
} {trigger}
do_test trigger1-8.2 {
  execsql {
    DROP TRIGGER 'trigger';
    SELECT name FROM sqlite_master WHERE type='trigger';
  }
} {}
do_test trigger1-8.3 {
  execsql {
    CREATE TRIGGER "trigger" AFTER INSERT ON t2 BEGIN SELECT 1; END;
    SELECT name FROM sqlite_master WHERE type='trigger';
  }
} {trigger}
do_test trigger1-8.4 {
  execsql {
    DROP TRIGGER "trigger";
    SELECT name FROM sqlite_master WHERE type='trigger';
  }
} {}
do_test trigger1-8.5 {
  execsql {
    CREATE TRIGGER [trigger] AFTER INSERT ON t2 BEGIN SELECT 1; END;
    SELECT name FROM sqlite_master WHERE type='trigger';
  }
} {trigger}
do_test trigger1-8.6 {
  execsql {
    DROP TRIGGER [trigger];
    SELECT name FROM sqlite_master WHERE type='trigger';
  }
} {}

# Make sure REPLACE works inside of triggers.
#
# There are two versions of trigger-9.1 and trigger-9.2. One that uses
# compound SELECT statements, and another that does not.
ifcapable compound {
do_test trigger1-9.1 {
  execsql {
    CREATE TABLE t3(a,b);
    CREATE TABLE t4(x UNIQUE, b);
    CREATE TRIGGER r34 AFTER INSERT ON t3 BEGIN
      REPLACE INTO t4 VALUES(new.a,new.b);
    END;
    INSERT INTO t3 VALUES(1,2);
    SELECT * FROM t3 UNION ALL SELECT 99, 99 UNION ALL SELECT * FROM t4;
  }
} {1 2 99 99 1 2}
do_test trigger1-9.2 {
  execsql {
    INSERT INTO t3 VALUES(1,3);
    SELECT * FROM t3 UNION ALL SELECT 99, 99 UNION ALL SELECT * FROM t4;
  }
} {1 2 1 3 99 99 1 3}
}
ifcapable !compound {
do_test trigger1-9.1 {
  execsql {
    CREATE TABLE t3(a,b);
    CREATE TABLE t4(x UNIQUE, b);
    CREATE TRIGGER r34 AFTER INSERT ON t3 BEGIN
      REPLACE INTO t4 VALUES(new.a,new.b);
    END;
    INSERT INTO t3 VALUES(1,2);
    SELECT * FROM t3; SELECT 99, 99; SELECT * FROM t4;
  }
} {1 2 99 99 1 2}
do_test trigger1-9.2 {
  execsql {
    INSERT INTO t3 VALUES(1,3);
    SELECT * FROM t3; SELECT 99, 99; SELECT * FROM t4;
  }
} {1 2 1 3 99 99 1 3}
}

execsql {
  DROP TABLE t2;
  DROP TABLE t3;
  DROP TABLE t4;
}

# Ticket #764. At one stage TEMP triggers would fail to re-install when the
# schema was reloaded. The following tests ensure that TEMP triggers are
# correctly re-installed.
#
# Also verify that references within trigger programs are resolved at
# statement compile time, not trigger installation time. This means, for
# example, that you can drop and re-create tables referenced by triggers. 
ifcapable tempdb {
  do_test trigger1-10.0 {
    file delete -force test2.db
    file delete -force test2.db-journal
    execsql {
      ATTACH 'test2.db' AS aux;
    }
  } {}
  do_test trigger1-10.1 {
    execsql {
      CREATE TABLE main.t4(a, b, c);
      CREATE TABLE temp.t4(a, b, c);
      CREATE TABLE aux.t4(a, b, c);
      CREATE TABLE insert_log(db, a, b, c);
    }
  } {}
  do_test trigger1-10.2 {
    execsql {
      CREATE TEMP TRIGGER trig1 AFTER INSERT ON main.t4 BEGIN 
        INSERT INTO insert_log VALUES('main', new.a, new.b, new.c);
      END;
      CREATE TEMP TRIGGER trig2 AFTER INSERT ON temp.t4 BEGIN 
        INSERT INTO insert_log VALUES('temp', new.a, new.b, new.c);
      END;
      CREATE TEMP TRIGGER trig3 AFTER INSERT ON aux.t4 BEGIN 
        INSERT INTO insert_log VALUES('aux', new.a, new.b, new.c);
      END;
    }
  } {}
  do_test trigger1-10.3 {
    execsql {
      INSERT INTO main.t4 VALUES(1, 2, 3);
      INSERT INTO temp.t4 VALUES(4, 5, 6);
      INSERT INTO aux.t4  VALUES(7, 8, 9);
    }
  } {}
  do_test trigger1-10.4 {
    execsql {
      SELECT * FROM insert_log;
    }
  } {main 1 2 3 temp 4 5 6 aux 7 8 9}
  do_test trigger1-10.5 {
    execsql {
      BEGIN;
      INSERT INTO main.t4 VALUES(1, 2, 3);
      INSERT INTO temp.t4 VALUES(4, 5, 6);
      INSERT INTO aux.t4  VALUES(7, 8, 9);
      ROLLBACK;
    }
  } {}
  do_test trigger1-10.6 {
    execsql {
      SELECT * FROM insert_log;
    }
  } {main 1 2 3 temp 4 5 6 aux 7 8 9}
  do_test trigger1-10.7 {
    execsql {
      DELETE FROM insert_log;
      INSERT INTO main.t4 VALUES(11, 12, 13);
      INSERT INTO temp.t4 VALUES(14, 15, 16);
      INSERT INTO aux.t4  VALUES(17, 18, 19);
    }
  } {}
  do_test trigger1-10.8 {
    execsql {
      SELECT * FROM insert_log;
    }
  } {main 11 12 13 temp 14 15 16 aux 17 18 19}
  do_test trigger1-10.8 {
  # Drop and re-create the insert_log table in a different database. Note
  # that we can change the column names because the trigger programs don't
  # use them explicitly.
    execsql {
      DROP TABLE insert_log;
      CREATE TABLE aux.insert_log(db, d, e, f);
    }
  } {}
  do_test trigger1-10.10 {
    execsql {
      INSERT INTO main.t4 VALUES(21, 22, 23);
      INSERT INTO temp.t4 VALUES(24, 25, 26);
      INSERT INTO aux.t4  VALUES(27, 28, 29);
    }
  } {}
  do_test trigger1-10.11 {
    execsql {
      SELECT * FROM insert_log;
    }
  } {main 21 22 23 temp 24 25 26 aux 27 28 29}
}

do_test trigger1-11.1 {
  catchsql {SELECT raise(abort,'message');}
} {1 {RAISE() may only be used within a trigger-program}}


finish_test