sqlite/test/trigger9.test

# 2008 January 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.
#
#***********************************************************************
# This file implements regression tests for SQLite library. Specifically,
# it tests some compiler optimizations for SQL statements featuring
# triggers:
#
#
#

# trigger9-1.* -   Test that if there are no references to OLD.* cols, or a
#                  reference to only OLD.rowid, the data is not loaded.
#
# trigger9-2.* -   Test that for NEW.* records populated by UPDATE 
#                  statements, unused fields are populated with NULL values. 
#
# trigger9-3.* -   Test that the temporary tables used for OLD.* references
#                  in "INSTEAD OF" triggers have NULL values in unused 
#                  fields.
#

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

proc has_rowdata {sql} {
  expr {[lsearch [execsql "explain $sql"] RowData]>=0}
}

do_test trigger9-1.1 {
  execsql {
    PRAGMA page_size = 1024;
    CREATE TABLE t1(x, y, z);
    INSERT INTO t1 VALUES('1', randstr(10000,10000), '2');
    INSERT INTO t1 VALUES('2', randstr(10000,10000), '4');
    INSERT INTO t1 VALUES('3', randstr(10000,10000), '6');
    CREATE TABLE t2(x);
  }
} {}

do_test trigger9-1.2.1 {
  execsql {
    BEGIN;
      CREATE TRIGGER trig1 BEFORE DELETE ON t1 BEGIN
        INSERT INTO t2 VALUES(old.rowid);
      END;
      DELETE FROM t1;
      SELECT * FROM t2;
  }
} {1 2 3}
do_test trigger9-1.2.3 {
  has_rowdata {DELETE FROM t1}
} 0
do_test trigger9-1.2.4 { execsql { ROLLBACK } } {}

do_test trigger9-1.3.1 {
  execsql {
    BEGIN;
      CREATE TRIGGER trig1 BEFORE DELETE ON t1 BEGIN
        INSERT INTO t2 VALUES(old.x);
      END;
      DELETE FROM t1;
      SELECT * FROM t2;
  }
} {1 2 3}
do_test trigger9-1.3.2 {
  has_rowdata {DELETE FROM t1}
} 0
do_test trigger9-1.3.3 { execsql { ROLLBACK } } {}

do_test trigger9-1.4.1 {
  execsql {
    BEGIN;
      CREATE TRIGGER trig1 BEFORE DELETE ON t1 WHEN old.x='1' BEGIN
        INSERT INTO t2 VALUES(old.rowid);
      END;
      DELETE FROM t1;
      SELECT * FROM t2;
  }
} {1}
do_test trigger9-1.4.2 {
  has_rowdata {DELETE FROM t1}
} 0
do_test trigger9-1.4.3 { execsql { ROLLBACK } } {}

do_test trigger9-1.5.1 {
  execsql {
    BEGIN;
      CREATE TRIGGER trig1 BEFORE UPDATE ON t1 BEGIN
        INSERT INTO t2 VALUES(old.rowid);
      END;
      UPDATE t1 SET y = '';
      SELECT * FROM t2;
  }
} {1 2 3}
do_test trigger9-1.5.2 {
  has_rowdata {UPDATE t1 SET y = ''}
} 0
do_test trigger9-1.5.3 { execsql { ROLLBACK } } {}

do_test trigger9-1.6.1 {
  execsql {
    BEGIN;
      CREATE TRIGGER trig1 BEFORE UPDATE ON t1 BEGIN
        INSERT INTO t2 VALUES(old.x);
      END;
      UPDATE t1 SET y = '';
      SELECT * FROM t2;
  }
} {1 2 3}
do_test trigger9-1.6.2 {
  has_rowdata {UPDATE t1 SET y = ''}
} 0
do_test trigger9-1.6.3 { execsql { ROLLBACK } } {}

do_test trigger9-1.7.1 {
  execsql {
    BEGIN;
      CREATE TRIGGER trig1 BEFORE UPDATE ON t1 WHEN old.x>='2' BEGIN
        INSERT INTO t2 VALUES(old.x);
      END;
      UPDATE t1 SET y = '';
      SELECT * FROM t2;
  }
} {2 3}
do_test trigger9-1.7.2 {
  has_rowdata {UPDATE t1 SET y = ''}
} 0
do_test trigger9-1.7.3 { execsql { ROLLBACK } } {}

do_test trigger9-3.1 {
  execsql {
    CREATE TABLE t3(a, b);
    INSERT INTO t3 VALUES(1, 'one');
    INSERT INTO t3 VALUES(2, 'two');
    INSERT INTO t3 VALUES(3, 'three');
  }
} {}
do_test trigger9-3.2 {
  execsql {
    BEGIN;
      CREATE VIEW v1 AS SELECT * FROM t3;
      CREATE TRIGGER trig1 INSTEAD OF UPDATE ON v1 BEGIN
        INSERT INTO t2 VALUES(old.a);
      END;
      UPDATE v1 SET b = 'hello';
      SELECT * FROM t2;
    ROLLBACK;
  }
} {1 2 3}
do_test trigger9-3.3 {
  # In this test the 'c' column of the view is not required by
  # the INSTEAD OF trigger, but the expression is reused internally as
  # part of the view's WHERE clause. Check that this does not cause
  # a problem.
  #
  execsql {
    BEGIN;
      CREATE VIEW v1 AS SELECT a, b AS c FROM t3 WHERE c > 'one';
      CREATE TRIGGER trig1 INSTEAD OF UPDATE ON v1 BEGIN
        INSERT INTO t2 VALUES(old.a);
      END;
      UPDATE v1 SET c = 'hello';
      SELECT * FROM t2;
    ROLLBACK;
  }
} {2 3}
do_test trigger9-3.4 {
  execsql {
    BEGIN;
      INSERT INTO t3 VALUES(3, 'three');
      INSERT INTO t3 VALUES(3, 'four');
      CREATE VIEW v1 AS SELECT DISTINCT a, b FROM t3;
      CREATE TRIGGER trig1 INSTEAD OF UPDATE ON v1 BEGIN
        INSERT INTO t2 VALUES(old.a);
      END;
      UPDATE v1 SET b = 'hello';
      SELECT * FROM t2;
    ROLLBACK;
  }
} {1 2 3 3}

ifcapable compound {
  do_test trigger9-3.5 {
    execsql {
      BEGIN;
        INSERT INTO t3 VALUES(1, 'uno');
        CREATE VIEW v1 AS SELECT a, b FROM t3 EXCEPT SELECT 1, 'one';
        CREATE TRIGGER trig1 INSTEAD OF UPDATE ON v1 BEGIN
          INSERT INTO t2 VALUES(old.a);
        END;
        UPDATE v1 SET b = 'hello';
        SELECT * FROM t2;
      ROLLBACK;
    }
  } {1 2 3}
  do_test trigger9-3.6 {
    execsql {
      BEGIN;
        INSERT INTO t3 VALUES(1, 'zero');
        CREATE VIEW v1 AS 
          SELECT sum(a) AS a, max(b) AS b FROM t3 GROUP BY t3.a HAVING b>'two';
        CREATE TRIGGER trig1 INSTEAD OF UPDATE ON v1 BEGIN
          INSERT INTO t2 VALUES(old.a);
        END;
        UPDATE v1 SET b = 'hello';
        SELECT * FROM t2;
      ROLLBACK;
    }
  } {2}
}

finish_test