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

Artifact b12ee5809d3e63aeb83238dd501a7bca7fd72c10:


# 2011 May 06
#
# 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.
#
#***********************************************************************
#

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

# Like [do_execsql_test], except it appends the value returned by 
# [db total_changes] to the result of executing the SQL script.
#
proc do_tc_test {tn sql res} {
  uplevel [list \
    do_test $tn "concat \[execsql {$sql}\] \[db total_changes\]" $res
  ]
}

do_execsql_test 1.0 {
  CREATE TABLE t1(a, b);
  CREATE INDEX t1_b ON t1(b);
  CREATE TABLE t2(x, y, PRIMARY KEY(x, y)) WITHOUT ROWID;
  CREATE INDEX t2_y ON t2(y);
}


#--------------------------------------------------------------------------
# EVIDENCE-OF: R-65438-26258 This function returns the total number of
# rows inserted, modified or deleted by all INSERT, UPDATE or DELETE
# statements completed since the database connection was opened,
# including those executed as part of trigger programs.
#
#   1.1.*: different types of I/U/D statements,
#   1.2.*: trigger programs.
#
do_tc_test 1.1.1 {
  INSERT INTO t1 VALUES(1, 2);
  INSERT INTO t1 VALUES(3, 4);
  UPDATE t1 SET a = a+1;
  DELETE FROM t1;
} {6}
do_tc_test 1.1.2 {
  DELETE FROM t1
} {6}

do_tc_test 1.1.3 {
  WITH data(a,b) AS (
      SELECT 0, 0 UNION ALL SELECT a+1, b+1 FROM data WHERE a<99
  )
  INSERT INTO t1 SELECT * FROM data;
} {106}

do_tc_test 1.1.4 {
  INSERT INTO t2 SELECT * FROM t1 WHERE a<50;
  UPDATE t2 SET y=y+1;
} {206}

do_tc_test 1.1.5 {
  DELETE FROM t2 WHERE y<=25
} {231}

do_execsql_test 1.2.1 {
  DELETE FROM t1;
  DELETE FROM t2;
}
sqlite3 db test.db     ; # To reset total_changes
do_tc_test 1.2.2 {
  CREATE TABLE log(detail);
  CREATE TRIGGER t1_after_insert AFTER INSERT ON t1 BEGIN 
    INSERT INTO log VALUES('inserted into t1');
  END;

  CREATE TRIGGER t1_before_delete BEFORE DELETE ON t1 BEGIN 
    INSERT INTO log VALUES('deleting from t1');
    INSERT INTO log VALUES('here we go!');
  END;

  CREATE TRIGGER t1_after_update AFTER UPDATE ON t1 BEGIN 
    INSERT INTO log VALUES('update');
    DELETE FROM log;
  END;

  INSERT INTO t1 VALUES('a', 'b');   -- 1 + 1
  UPDATE t1 SET b='c';               -- 1 + 1 + 2
  DELETE FROM t1;                    -- 1 + 1 + 1
} {9}

#--------------------------------------------------------------------------
# EVIDENCE-OF: R-61766-15253 Executing any other type of SQL statement
# does not affect the value returned by sqlite3_total_changes().
do_tc_test 2.1 {
  INSERT INTO t1 VALUES(1, 2), (3, 4);
  INSERT INTO t2 VALUES(1, 2), (3, 4);
} {15}
do_tc_test 2.2 {
  SELECT count(*) FROM t1;
} {2 15}
do_tc_test 2.3 {
  CREATE TABLE t4(a, b);
  ALTER TABLE t4 ADD COLUMN c;
  CREATE INDEX i4 ON t4(c);
  ALTER TABLE t4 RENAME TO t5;
  ANALYZE;
  BEGIN;
  DROP TABLE t2;
  ROLLBACK;
  VACUUM;
} {15}


#--------------------------------------------------------------------------
# EVIDENCE-OF: R-36043-10590 Changes made as part of foreign key
# actions are included in the count, but those made as part of REPLACE
# constraint resolution are not.
#
#   3.1.*: foreign key actions
#   3.2.*: REPLACE constraints.
#
sqlite3 db test.db     ; # To reset total_changes
do_tc_test 3.1.1 {
  CREATE TABLE p1(c PRIMARY KEY, d);
  CREATE TABLE c1(a, b, FOREIGN KEY(a) REFERENCES p1 ON DELETE SET NULL);
  CREATE TABLE c2(a, b, FOREIGN KEY(a) REFERENCES p1 ON DELETE CASCADE);
  CREATE TABLE c3(a, b, FOREIGN KEY(a) REFERENCES p1 ON DELETE SET DEFAULT);

  INSERT INTO p1 VALUES(1, 'one');
  INSERT INTO p1 VALUES(2, 'two');
  INSERT INTO p1 VALUES(3, 'three');
  INSERT INTO p1 VALUES(4, 'four');

  INSERT INTO c1 VALUES(1, 'i');
  INSERT INTO c2 VALUES(2, 'ii');
  INSERT INTO c3 VALUES(3, 'iii');
  PRAGMA foreign_keys = ON;
} {7}

do_tc_test 3.1.2 { DELETE FROM p1 WHERE c=1; } {9}
do_tc_test 3.1.3 { DELETE FROM p1 WHERE c=2; } {11}
do_tc_test 3.1.4 { DELETE FROM p1 WHERE c=3; } {13}
do_tc_test 3.1.5 { DELETE FROM p1 WHERE c=4; } {14}  ; # only 1 this time.

sqlite3 db test.db     ; # To reset total_changes
do_tc_test 3.1.6 {
  DROP TABLE c1;
  DROP TABLE c2;
  DROP TABLE c3;
  CREATE TABLE c1(a, b, FOREIGN KEY(a) REFERENCES p1 ON UPDATE SET NULL);
  CREATE TABLE c2(a, b, FOREIGN KEY(a) REFERENCES p1 ON UPDATE CASCADE);
  CREATE TABLE c3(a, b, FOREIGN KEY(a) REFERENCES p1 ON UPDATE SET DEFAULT);

  INSERT INTO p1 VALUES(1, 'one');
  INSERT INTO p1 VALUES(2, 'two');
  INSERT INTO p1 VALUES(3, 'three');
  INSERT INTO p1 VALUES(4, 'four');

  INSERT INTO c1 VALUES(1, 'i');
  INSERT INTO c2 VALUES(2, 'ii');
  INSERT INTO c3 VALUES(3, 'iii');
  PRAGMA foreign_keys = ON;
} {7}

do_tc_test 3.1.7  { UPDATE p1 SET c=c+4 WHERE c=1; } {9}
do_tc_test 3.1.8  { UPDATE p1 SET c=c+4 WHERE c=2; } {11}
do_tc_test 3.1.9  { UPDATE p1 SET c=c+4 WHERE c=3; } {13}
do_tc_test 3.1.10 { UPDATE p1 SET c=c+4 WHERE c=4; } {14}  ; # only 1 this time.

sqlite3 db test.db     ; # To reset total_changes
do_tc_test 3.2.1 {
  CREATE TABLE t3(a UNIQUE, b UNIQUE);
  INSERT INTO t3 VALUES('one', 'one');
  INSERT INTO t3 VALUES('two', 'two');
  INSERT OR REPLACE INTO t3 VALUES('one', 'two');
} {3}

do_tc_test 3.2.2 {
  INSERT INTO t3 VALUES('three', 'one');
  UPDATE OR REPLACE t3 SET b='two' WHERE b='one';
  SELECT * FROM t3;
} {three two 5}

#--------------------------------------------------------------------------
# EVIDENCE-OF: R-54872-08741 Changes to a view that are intercepted by
# INSTEAD OF triggers are not counted.
#
sqlite3 db test.db     ; # To reset total_changes
do_tc_test 4.1 {
  CREATE TABLE t6(x);
  CREATE VIEW v1 AS SELECT * FROM t6;
  CREATE TRIGGER v1_tr1 INSTEAD OF INSERT ON v1 BEGIN
    SELECT 'no-op';
  END;

  INSERT INTO v1 VALUES('a');
  INSERT INTO v1 VALUES('b');
} {0}
do_tc_test 4.2 {
  CREATE TRIGGER v1_tr2 INSTEAD OF INSERT ON v1 BEGIN
    INSERT INTO t6 VALUES(new.x);
  END;

  INSERT INTO v1 VALUES('c');
  INSERT INTO v1 VALUES('d');
} {2}


finish_test