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Overview
Comment:Modify the documentation for sqlite3_changes() to make it more testable. Add tests and minor fixes for the same.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 41cdd0c422d61533a94870cb5ad094682956d472
User & Date: dan 2014-10-28 18:24:16
Context
2014-10-28
20:35
Update the documentation on the sqlite3_randomness() interface to conform to enhancements associated with the SQLITE_ENABLE_API_ARMOR change. check-in: 96e9917c user: drh tags: trunk
18:24
Modify the documentation for sqlite3_changes() to make it more testable. Add tests and minor fixes for the same. check-in: 41cdd0c4 user: dan tags: trunk
16:50
Fix a crash that could occur if the WHERE clause of an UPDATE statement on a view that does not feature a column named "rowid" contains a term such as "rowid=?". check-in: 8523670d user: dan tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/sqlite.h.in.

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** last insert [rowid].
*/
sqlite3_int64 sqlite3_last_insert_rowid(sqlite3*);

/*
** CAPI3REF: Count The Number Of Rows Modified
**
** ^This function returns the number of database rows that were changed
** or inserted or deleted by the most recently completed SQL statement
** on the [database connection] specified by the first parameter.
** ^(Only changes that are directly specified by the [INSERT], [UPDATE],
** or [DELETE] statement are counted.  Auxiliary changes caused by
** triggers or [foreign key actions] are not counted.)^ Use the
** [sqlite3_total_changes()] function to find the total number of changes
** including changes caused by triggers and foreign key actions.

**
** ^Changes to a view that are simulated by an [INSTEAD OF trigger]



** are not counted.  Only real table changes are counted.
**
** ^(A "row change" is a change to a single row of a single table
** caused by an INSERT, DELETE, or UPDATE statement.  Rows that
** are changed as side effects of [REPLACE] constraint resolution,
** rollback, ABORT processing, [DROP TABLE], or by any other
** mechanisms do not count as direct row changes.)^



**
** A "trigger context" is a scope of execution that begins and
** ends with the script of a [CREATE TRIGGER | trigger]. 
** Most SQL statements are
** evaluated outside of any trigger.  This is the "top level"
** trigger context.  If a trigger fires from the top level, a
** new trigger context is entered for the duration of that one
** trigger.  Subtriggers create subcontexts for their duration.
**
** ^Calling [sqlite3_exec()] or [sqlite3_step()] recursively does
** not create a new trigger context.
**
** ^This function returns the number of direct row changes in the
** most recent INSERT, UPDATE, or DELETE statement within the same
** trigger context.
**
** ^Thus, when called from the top level, this function returns the
** number of changes in the most recent INSERT, UPDATE, or DELETE
** that also occurred at the top level.  ^(Within the body of a trigger,
** the sqlite3_changes() interface can be called to find the number of
** changes in the most recently completed INSERT, UPDATE, or DELETE
** statement within the body of the same trigger.
** However, the number returned does not include changes
** caused by subtriggers since those have their own context.)^
**
** See also the [sqlite3_total_changes()] interface, the
** [count_changes pragma], and the [changes() SQL function].
**
** If a separate thread makes changes on the same database connection
** while [sqlite3_changes()] is running then the value returned
** is unpredictable and not meaningful.
................................................................................
**
** ^This function returns the number of row changes caused by [INSERT],
** [UPDATE] or [DELETE] statements since the [database connection] was opened.
** ^(The count returned by sqlite3_total_changes() includes all changes
** from all [CREATE TRIGGER | trigger] contexts and changes made by
** [foreign key actions]. However,
** the count does not include changes used to implement [REPLACE] constraints,
** do rollbacks or ABORT processing, or [DROP TABLE] processing.  The
** count does not include rows of views that fire an [INSTEAD OF trigger],
** though if the INSTEAD OF trigger makes changes of its own, those changes 
** are counted.)^
** ^The sqlite3_total_changes() function counts the changes as soon as
** the statement that makes them is completed (when the statement handle
** is passed to [sqlite3_reset()] or [sqlite3_finalize()]).
**







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** last insert [rowid].
*/
sqlite3_int64 sqlite3_last_insert_rowid(sqlite3*);

/*
** CAPI3REF: Count The Number Of Rows Modified
**
** ^This function returns the number of rows modified, inserted or
** deleted by the most recently completed INSERT, UPDATE or DELETE
** statement on the database connection specified by the only parameter.
** ^Executing any other type of SQL statement does not modify the value
** returned by this function.
**
** ^Only changes made directly by the INSERT, UPDATE or DELETE statement are
** considered - auxiliary changes caused by [CREATE TRIGGER | triggers], 
** [foreign key actions] or [REPLACE] constraint resolution are not counted.
** 
** Changes to a view that are intercepted by 
** [INSTEAD OF trigger | INSTEAD OF triggers] are not counted. ^The value 
** returned by sqlite3_changes() immediately after an INSERT, UPDATE or 
** DELETE statement run on a view is always zero. Only changes made to real 
** tables are counted.
**




** Things are more complicated if the sqlite3_changes() function is
** executed while a trigger program is running. This may happen if the
** program uses the [changes() SQL function], or if some other callback
** function invokes sqlite3_changes() directly. Essentially:
** 



** <ul>
**   <li> ^(Before entering a trigger program the value returned by
**        sqlite3_changes() function is saved. After the trigger program 
**        has finished, the original value is restored.)^
** 
**   <li> ^(Within a trigger program each INSERT, UPDATE and DELETE 
**        statement sets the value returned by sqlite3_changes() 
**        upon completion as normal. Of course, this value will not include 
**        any changes performed by sub-triggers, as the sqlite3_changes() 
**        value will be saved and restored after each sub-trigger has run.)^
** </ul>
** 
** ^This means that if the changes() SQL function (or similar) is used
** by the first INSERT, UPDATE or DELETE statement within a trigger, it 
** returns the value as set when the calling statement began executing.
** ^If it is used by the second or subsequent such statement within a trigger 
** program, the value returned reflects the number of rows modified by the 
** previous INSERT, UPDATE or DELETE statement within the same trigger.


**
** See also the [sqlite3_total_changes()] interface, the
** [count_changes pragma], and the [changes() SQL function].
**
** If a separate thread makes changes on the same database connection
** while [sqlite3_changes()] is running then the value returned
** is unpredictable and not meaningful.
................................................................................
**
** ^This function returns the number of row changes caused by [INSERT],
** [UPDATE] or [DELETE] statements since the [database connection] was opened.
** ^(The count returned by sqlite3_total_changes() includes all changes
** from all [CREATE TRIGGER | trigger] contexts and changes made by
** [foreign key actions]. However,
** the count does not include changes used to implement [REPLACE] constraints,
** rollbacks or [DROP TABLE] commands.  The
** count does not include rows of views that fire an [INSTEAD OF trigger],
** though if the INSTEAD OF trigger makes changes of its own, those changes 
** are counted.)^
** ^The sqlite3_total_changes() function counts the changes as soon as
** the statement that makes them is completed (when the statement handle
** is passed to [sqlite3_reset()] or [sqlite3_finalize()]).
**

Changes to src/vdbe.c.

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    assert( pc==pFrame->pc );
  }

  p->nFrame++;
  pFrame->pParent = p->pFrame;
  pFrame->lastRowid = lastRowid;
  pFrame->nChange = p->nChange;

  p->nChange = 0;
  p->pFrame = pFrame;
  p->aMem = aMem = &VdbeFrameMem(pFrame)[-1];
  p->nMem = pFrame->nChildMem;
  p->nCursor = (u16)pFrame->nChildCsr;
  p->apCsr = (VdbeCursor **)&aMem[p->nMem+1];
  p->aOp = aOp = pProgram->aOp;







>







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    assert( pc==pFrame->pc );
  }

  p->nFrame++;
  pFrame->pParent = p->pFrame;
  pFrame->lastRowid = lastRowid;
  pFrame->nChange = p->nChange;
  pFrame->nDbChange = p->db->nChange;
  p->nChange = 0;
  p->pFrame = pFrame;
  p->aMem = aMem = &VdbeFrameMem(pFrame)[-1];
  p->nMem = pFrame->nChildMem;
  p->nCursor = (u16)pFrame->nChildCsr;
  p->apCsr = (VdbeCursor **)&aMem[p->nMem+1];
  p->aOp = aOp = pProgram->aOp;

Changes to src/vdbeInt.h.

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  int nCursor;            /* Number of entries in apCsr */
  int pc;                 /* Program Counter in parent (calling) frame */
  int nOp;                /* Size of aOp array */
  int nMem;               /* Number of entries in aMem */
  int nOnceFlag;          /* Number of entries in aOnceFlag */
  int nChildMem;          /* Number of memory cells for child frame */
  int nChildCsr;          /* Number of cursors for child frame */
  int nChange;            /* Statement changes (Vdbe.nChanges)     */

};

#define VdbeFrameMem(p) ((Mem *)&((u8 *)p)[ROUND8(sizeof(VdbeFrame))])

/*
** A value for VdbeCursor.cacheValid that means the cache is always invalid.
*/







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  int nCursor;            /* Number of entries in apCsr */
  int pc;                 /* Program Counter in parent (calling) frame */
  int nOp;                /* Size of aOp array */
  int nMem;               /* Number of entries in aMem */
  int nOnceFlag;          /* Number of entries in aOnceFlag */
  int nChildMem;          /* Number of memory cells for child frame */
  int nChildCsr;          /* Number of cursors for child frame */
  int nChange;            /* Statement changes (Vdbe.nChange)     */
  int nDbChange;          /* Value of db->nChange */
};

#define VdbeFrameMem(p) ((Mem *)&((u8 *)p)[ROUND8(sizeof(VdbeFrame))])

/*
** A value for VdbeCursor.cacheValid that means the cache is always invalid.
*/

Changes to src/vdbeaux.c.

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  v->nOp = pFrame->nOp;
  v->aMem = pFrame->aMem;
  v->nMem = pFrame->nMem;
  v->apCsr = pFrame->apCsr;
  v->nCursor = pFrame->nCursor;
  v->db->lastRowid = pFrame->lastRowid;
  v->nChange = pFrame->nChange;

  return pFrame->pc;
}

/*
** Close all cursors.
**
** Also release any dynamic memory held by the VM in the Vdbe.aMem memory 
................................................................................
        }else{
          /* We are forced to roll back the active transaction. Before doing
          ** so, abort any other statements this handle currently has active.
          */
          sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
          sqlite3CloseSavepoints(db);
          db->autoCommit = 1;

        }
      }
    }

    /* Check for immediate foreign key violations. */
    if( p->rc==SQLITE_OK ){
      sqlite3VdbeCheckFk(p, 0);
................................................................................
        }
        if( rc==SQLITE_BUSY && p->readOnly ){
          sqlite3VdbeLeave(p);
          return SQLITE_BUSY;
        }else if( rc!=SQLITE_OK ){
          p->rc = rc;
          sqlite3RollbackAll(db, SQLITE_OK);

        }else{
          db->nDeferredCons = 0;
          db->nDeferredImmCons = 0;
          db->flags &= ~SQLITE_DeferFKs;
          sqlite3CommitInternalChanges(db);
        }
      }else{
        sqlite3RollbackAll(db, SQLITE_OK);

      }
      db->nStatement = 0;
    }else if( eStatementOp==0 ){
      if( p->rc==SQLITE_OK || p->errorAction==OE_Fail ){
        eStatementOp = SAVEPOINT_RELEASE;
      }else if( p->errorAction==OE_Abort ){
        eStatementOp = SAVEPOINT_ROLLBACK;
      }else{
        sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
        sqlite3CloseSavepoints(db);
        db->autoCommit = 1;

      }
    }
  
    /* If eStatementOp is non-zero, then a statement transaction needs to
    ** be committed or rolled back. Call sqlite3VdbeCloseStatement() to
    ** do so. If this operation returns an error, and the current statement
    ** error code is SQLITE_OK or SQLITE_CONSTRAINT, then promote the
................................................................................
          p->rc = rc;
          sqlite3DbFree(db, p->zErrMsg);
          p->zErrMsg = 0;
        }
        sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
        sqlite3CloseSavepoints(db);
        db->autoCommit = 1;

      }
    }
  
    /* If this was an INSERT, UPDATE or DELETE and no statement transaction
    ** has been rolled back, update the database connection change-counter. 
    */
    if( p->changeCntOn ){







>







 







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  v->nOp = pFrame->nOp;
  v->aMem = pFrame->aMem;
  v->nMem = pFrame->nMem;
  v->apCsr = pFrame->apCsr;
  v->nCursor = pFrame->nCursor;
  v->db->lastRowid = pFrame->lastRowid;
  v->nChange = pFrame->nChange;
  v->db->nChange = pFrame->nDbChange;
  return pFrame->pc;
}

/*
** Close all cursors.
**
** Also release any dynamic memory held by the VM in the Vdbe.aMem memory 
................................................................................
        }else{
          /* We are forced to roll back the active transaction. Before doing
          ** so, abort any other statements this handle currently has active.
          */
          sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
          sqlite3CloseSavepoints(db);
          db->autoCommit = 1;
          p->nChange = 0;
        }
      }
    }

    /* Check for immediate foreign key violations. */
    if( p->rc==SQLITE_OK ){
      sqlite3VdbeCheckFk(p, 0);
................................................................................
        }
        if( rc==SQLITE_BUSY && p->readOnly ){
          sqlite3VdbeLeave(p);
          return SQLITE_BUSY;
        }else if( rc!=SQLITE_OK ){
          p->rc = rc;
          sqlite3RollbackAll(db, SQLITE_OK);
          p->nChange = 0;
        }else{
          db->nDeferredCons = 0;
          db->nDeferredImmCons = 0;
          db->flags &= ~SQLITE_DeferFKs;
          sqlite3CommitInternalChanges(db);
        }
      }else{
        sqlite3RollbackAll(db, SQLITE_OK);
        p->nChange = 0;
      }
      db->nStatement = 0;
    }else if( eStatementOp==0 ){
      if( p->rc==SQLITE_OK || p->errorAction==OE_Fail ){
        eStatementOp = SAVEPOINT_RELEASE;
      }else if( p->errorAction==OE_Abort ){
        eStatementOp = SAVEPOINT_ROLLBACK;
      }else{
        sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
        sqlite3CloseSavepoints(db);
        db->autoCommit = 1;
        p->nChange = 0;
      }
    }
  
    /* If eStatementOp is non-zero, then a statement transaction needs to
    ** be committed or rolled back. Call sqlite3VdbeCloseStatement() to
    ** do so. If this operation returns an error, and the current statement
    ** error code is SQLITE_OK or SQLITE_CONSTRAINT, then promote the
................................................................................
          p->rc = rc;
          sqlite3DbFree(db, p->zErrMsg);
          p->zErrMsg = 0;
        }
        sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
        sqlite3CloseSavepoints(db);
        db->autoCommit = 1;
        p->nChange = 0;
      }
    }
  
    /* If this was an INSERT, UPDATE or DELETE and no statement transaction
    ** has been rolled back, update the database connection change-counter. 
    */
    if( p->changeCntOn ){

Added test/e_changes.test.



















































































































































































































































































































































































































































































































































































































































































































































































































































































































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# 2011 October 28
#
# 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_changes

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


#--------------------------------------------------------------------------
# EVIDENCE-OF: R-15996-49369 This function returns the number of rows
# modified, inserted or deleted by the most recently completed INSERT,
# UPDATE or DELETE statement on the database connection specified by the
# only parameter.
#
do_execsql_test 1.0 {
  CREATE TABLE t1(a, b);
  CREATE TABLE t2(x, y, PRIMARY KEY(x, y)) WITHOUT ROWID;
  CREATE INDEX i1 ON t1(a);
  CREATE INDEX i2 ON t2(y);
}
foreach {tn schema} {
  1 { 
      CREATE TABLE t1(a, b);
      CREATE INDEX i1 ON t1(b);
  }
  2 { 
      CREATE TABLE t1(a, b, PRIMARY KEY(a, b)) WITHOUT ROWID;
      CREATE INDEX i1 ON t1(b);
  }
} {
  reset_db
  execsql $schema

  # Insert 1 row.
  do_changes_test 1.$tn.1 { INSERT INTO t1 VALUES(0, 0) } 1

  # Insert 10 rows.
  do_changes_test 1.$tn.2 {
    WITH rows(i, j) AS (
        SELECT 1, 1 UNION ALL SELECT i+1, j+i FROM rows WHERE i<10
    )
    INSERT INTO t1 SELECT * FROM rows
  } 10

  # Modify 5 rows.
  do_changes_test 1.$tn.3 {
    UPDATE t1 SET b=b+1 WHERE a<5;
  } 5

  # Delete 4 rows
  do_changes_test 1.$tn.4 {
    DELETE FROM t1 WHERE a>6
  } 4

  # Check the "on the database connecton specified" part of hte
  # requirement - changes made by other connections do not show up in
  # the return value of sqlite3_changes().
  do_test 1.$tn.5 {
    sqlite3 db2 test.db
    execsql { INSERT INTO t1 VALUES(-1, -1) } db2
    db2 changes
  } 1
  do_test 1.$tn.6 {
    db changes
  } 4
  db2 close

  # Test that statements that modify no rows because they hit UNIQUE
  # constraints set the sqlite3_changes() value to 0. Regardless of
  # whether or not they are executed inside an explicit transaction.
  #
  #   1.$tn.8-9: outside of a transaction
  #   1.$tn.10-12: inside a transaction
  #
  do_changes_test 1.$tn.7 {
    CREATE UNIQUE INDEX i2 ON t1(a);
  } 4
  do_catchsql_test 1.$tn.8 {
    INSERT INTO t1 VALUES('a', 0), ('b', 0), ('c', 0), (0, 11);
  } {1 {UNIQUE constraint failed: t1.a}}
  do_test 1.$tn.9 { db changes } 0
  do_catchsql_test 1.$tn.10 {
    BEGIN;
      INSERT INTO t1 VALUES('a', 0), ('b', 0), ('c', 0), (0, 11);
  } {1 {UNIQUE constraint failed: t1.a}}
  do_test 1.$tn.11 { db changes } 0
  do_changes_test 1.$tn.12 COMMIT 0

}


#--------------------------------------------------------------------------
# EVIDENCE-OF: R-44877-05564 Executing any other type of SQL statement
# does not modify the value returned by this function.
#
reset_db
do_changes_test 2.1 { CREATE TABLE t1(x)          } 0
do_changes_test 2.2 { 
  WITH d(y) AS (SELECT 1 UNION ALL SELECT y+1 FROM d WHERE y<47)
  INSERT INTO t1 SELECT y FROM d;
} 47

# The statement above set changes() to 47. Check that none of the following
# modify this.
do_changes_test 2.3 { SELECT count(x) FROM t1 } {47 47}
do_changes_test 2.4 { DROP TABLE t1               } 47
do_changes_test 2.5 { CREATE TABLE t1(x)          } 47
do_changes_test 2.6 { ALTER TABLE t1 ADD COLUMN b } 47


#--------------------------------------------------------------------------
# EVIDENCE-OF: R-53938-27527 Only changes made directly by the INSERT,
# UPDATE or DELETE statement are considered - auxiliary changes caused
# by triggers, foreign key actions or REPLACE constraint resolution are
# not counted.
#
#   3.1.*: triggers
#   3.2.*: foreign key actions
#   3.3.*: replace constraints
#
reset_db
do_execsql_test 3.1.0 {
  CREATE TABLE log(x);
  CREATE TABLE p1(one PRIMARY KEY, two);

  CREATE TRIGGER tr_ai AFTER INSERT ON p1 BEGIN
    INSERT INTO log VALUES('insert');
  END;
  CREATE TRIGGER tr_bd BEFORE DELETE ON p1 BEGIN
    INSERT INTO log VALUES('delete');
  END;
  CREATE TRIGGER tr_au AFTER UPDATE ON p1 BEGIN
    INSERT INTO log VALUES('update');
  END;

}

do_changes_test 3.1.1 {
  INSERT INTO p1 VALUES('a', 'A'), ('b', 'B'), ('c', 'C');
} 3
do_changes_test 3.1.2 {
  UPDATE p1 SET two = two||two;
} 3
do_changes_test 3.1.3 {
  DELETE FROM p1 WHERE one IN ('a', 'c');
} 2
do_execsql_test 3.1.4 {
  -- None of the inserts on table log were counted.
  SELECT count(*) FROM log
} 8

do_execsql_test 3.2.0 {
  DELETE FROM p1;
  INSERT INTO p1 VALUES('a', 'A'), ('b', 'B'), ('c', 'C');

  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 SET DEFAULT);
  CREATE TABLE c3(a, b, FOREIGN KEY(a) REFERENCES p1 ON DELETE CASCADE);
  INSERT INTO c1 VALUES('a', 'aaa');
  INSERT INTO c2 VALUES('b', 'bbb');
  INSERT INTO c3 VALUES('c', 'ccc');

  INSERT INTO p1 VALUES('d', 'D'), ('e', 'E'), ('f', 'F');
  CREATE TABLE c4(a, b, FOREIGN KEY(a) REFERENCES p1 ON UPDATE SET NULL);
  CREATE TABLE c5(a, b, FOREIGN KEY(a) REFERENCES p1 ON UPDATE SET DEFAULT);
  CREATE TABLE c6(a, b, FOREIGN KEY(a) REFERENCES p1 ON UPDATE CASCADE);
  INSERT INTO c4 VALUES('d', 'aaa');
  INSERT INTO c5 VALUES('e', 'bbb');
  INSERT INTO c6 VALUES('f', 'ccc');

  PRAGMA foreign_keys = ON;
}

do_changes_test 3.2.1 { DELETE FROM p1 WHERE one = 'a' } 1
do_changes_test 3.2.2 { DELETE FROM p1 WHERE one = 'b' } 1
do_changes_test 3.2.3 { DELETE FROM p1 WHERE one = 'c' } 1
do_execsql_test 3.2.4 { 
  SELECT * FROM c1;
  SELECT * FROM c2;
  SELECT * FROM c3;
} {{} aaa {} bbb}

do_changes_test 3.2.5 { UPDATE p1 SET one = 'g' WHERE one = 'd' } 1
do_changes_test 3.2.6 { UPDATE p1 SET one = 'h' WHERE one = 'e' } 1
do_changes_test 3.2.7 { UPDATE p1 SET one = 'i' WHERE one = 'f' } 1
do_execsql_test 3.2.8 { 
  SELECT * FROM c4;
  SELECT * FROM c5;
  SELECT * FROM c6;
} {{} aaa {} bbb i ccc}

do_execsql_test 3.3.0 {
  CREATE TABLE r1(a UNIQUE, b UNIQUE);
  INSERT INTO r1 VALUES('i', 'i');
  INSERT INTO r1 VALUES('ii', 'ii');
  INSERT INTO r1 VALUES('iii', 'iii');
  INSERT INTO r1 VALUES('iv', 'iv');
  INSERT INTO r1 VALUES('v', 'v');
  INSERT INTO r1 VALUES('vi', 'vi');
  INSERT INTO r1 VALUES('vii', 'vii');
}

do_changes_test 3.3.1 { INSERT OR REPLACE INTO r1 VALUES('i', 1)    }   1
do_changes_test 3.3.2 { INSERT OR REPLACE INTO r1 VALUES('iv', 'v') }   1
do_changes_test 3.3.3 { UPDATE OR REPLACE r1 SET b='v' WHERE a='iii' }  1
do_changes_test 3.3.4 { UPDATE OR REPLACE r1 SET b='vi',a='vii' WHERE a='ii' } 1
do_execsql_test 3.3.5 { 
  SELECT * FROM r1 ORDER BY a;
} {i 1   iii v   vii vi}


#--------------------------------------------------------------------------
# EVIDENCE-OF: R-09813-48563 The value returned by sqlite3_changes()
# immediately after an INSERT, UPDATE or DELETE statement run on a view
# is always zero.
#
reset_db
do_execsql_test 4.1 {
  CREATE TABLE log(log);
  CREATE TABLE t1(x, y);
  INSERT INTO t1 VALUES(1, 2);
  INSERT INTO t1 VALUES(3, 4);
  INSERT INTO t1 VALUES(5, 6);

  CREATE VIEW v1 AS SELECT * FROM t1;
  CREATE TRIGGER v1_i INSTEAD OF INSERT ON v1 BEGIN
    INSERT INTO log VALUES('insert');
  END;
  CREATE TRIGGER v1_u INSTEAD OF UPDATE ON v1 BEGIN
    INSERT INTO log VALUES('update'), ('update');
  END;
  CREATE TRIGGER v1_d INSTEAD OF DELETE ON v1 BEGIN
    INSERT INTO log VALUES('delete'), ('delete'), ('delete');
  END;
}

do_changes_test 4.2.1 { INSERT INTO t1 SELECT * FROM t1 }  3
do_changes_test 4.2.2 { INSERT INTO v1 VALUES(1, 2) }      0

do_changes_test 4.3.1 { INSERT INTO t1 SELECT * FROM t1 }  6
do_changes_test 4.3.2 { UPDATE v1 SET y='xyz' WHERE x=1 }  0

do_changes_test 4.4.1 { INSERT INTO t1 SELECT * FROM t1 } 12
do_changes_test 4.4.2 { DELETE FROM v1 WHERE x=5 }         0


#--------------------------------------------------------------------------
# EVIDENCE-OF: R-32918-61474 Before entering a trigger program the value
# returned by sqlite3_changes() function is saved. After the trigger
# program has finished, the original value is restored.
#
reset_db
db func my_changes my_changes
set ::changes [list]
proc my_changes {x} {
  set res [db changes]
  lappend ::changes $x $res
  return $res
}

do_execsql_test 5.1.0 {
  CREATE TABLE t1(a INTEGER PRIMARY KEY, b);
  CREATE TABLE t2(x);
  INSERT INTO t1 VALUES(1, NULL);
  INSERT INTO t1 VALUES(2, NULL);
  INSERT INTO t1 VALUES(3, NULL);
  CREATE TRIGGER AFTER UPDATE ON t1 BEGIN
    INSERT INTO t2 VALUES('a'), ('b'), ('c');
    SELECT my_changes('trigger');
  END;
}

do_execsql_test 5.1.1 {
  INSERT INTO t2 VALUES('a'), ('b');
  UPDATE t1 SET b = my_changes('update');
  SELECT * FROM t1;
} {1 2 2 2 3 2}

# Value is being restored to "2" when the trigger program exits.
do_test 5.1.2 {
  set ::changes
} {update 2 trigger 3 update 2 trigger 3 update 2 trigger 3}


reset_db
do_execsql_test 5.2.0 {
  CREATE TABLE t1(a, b);
  CREATE TABLE log(x);
  INSERT INTO t1 VALUES(1, 0);
  INSERT INTO t1 VALUES(2, 0);
  INSERT INTO t1 VALUES(3, 0);
  CREATE TRIGGER t1_a_u AFTER UPDATE ON t1 BEGIN
    INSERT INTO log VALUES(old.b || ' -> ' || new.b || ' c = ' || changes() );
  END;
  CREATE TABLE t2(a);
  INSERT INTO t2 VALUES(1), (2), (3);
  UPDATE t1 SET b = changes();
}
do_execsql_test 5.2.1 {
  SELECT * FROM t1;
} {1 3 2 3 3 3}
do_execsql_test 5.2.2 {
  SELECT * FROM log;
} {{0 -> 3 c = 3} {0 -> 3 c = 3} {0 -> 3 c = 3}}


#--------------------------------------------------------------------------
# EVIDENCE-OF: R-17146-37073 Within a trigger program each INSERT,
# UPDATE and DELETE statement sets the value returned by
# sqlite3_changes() upon completion as normal. Of course, this value
# will not include any changes performed by sub-triggers, as the
# sqlite3_changes() value will be saved and restored after each
# sub-trigger has run.
reset_db
do_execsql_test 6.0 {

  CREATE TABLE t1(a, b);
  CREATE TABLE t2(a, b);
  CREATE TABLE t3(a, b);
  CREATE TABLE log(x);

  CREATE TRIGGER t1_i BEFORE INSERT ON t1 BEGIN
    INSERT INTO t2 VALUES(new.a, new.b), (new.a, new.b);
    INSERT INTO log VALUES('t2->' || changes());
  END;

  CREATE TRIGGER t2_i AFTER INSERT ON t2 BEGIN
    INSERT INTO t3 VALUES(new.a, new.b), (new.a, new.b), (new.a, new.b);
    INSERT INTO log VALUES('t3->' || changes());
  END;

  CREATE TRIGGER t1_u AFTER UPDATE ON t1 BEGIN
    UPDATE t2 SET b=new.b WHERE a=old.a;
    INSERT INTO log VALUES('t2->' || changes());
  END;

  CREATE TRIGGER t2_u BEFORE UPDATE ON t2 BEGIN
    UPDATE t3 SET b=new.b WHERE a=old.a;
    INSERT INTO log VALUES('t3->' || changes());
  END;

  CREATE TRIGGER t1_d AFTER DELETE ON t1 BEGIN
    DELETE FROM t2 WHERE a=old.a AND b=old.b;
    INSERT INTO log VALUES('t2->' || changes());
  END;

  CREATE TRIGGER t2_d BEFORE DELETE ON t2 BEGIN
    DELETE FROM t3 WHERE a=old.a AND b=old.b;
    INSERT INTO log VALUES('t3->' || changes());
  END;
}

do_changes_test 6.1 {
  INSERT INTO t1 VALUES('+', 'o');
  SELECT * FROM log;
} {t3->3 t3->3 t2->2 1}

do_changes_test 6.2 {
  DELETE FROM log;
  UPDATE t1 SET b='*';
  SELECT * FROM log;
} {t3->6 t3->6 t2->2 1}

do_changes_test 6.3 {
  DELETE FROM log;
  DELETE FROM t1;
  SELECT * FROM log;
} {t3->6 t3->0 t2->2 1}


#--------------------------------------------------------------------------
# EVIDENCE-OF: R-43399-09409 This means that if the changes() SQL
# function (or similar) is used by the first INSERT, UPDATE or DELETE
# statement within a trigger, it returns the value as set when the
# calling statement began executing.
#
# EVIDENCE-OF: R-53215-27584 If it is used by the second or subsequent
# such statement within a trigger program, the value returned reflects
# the number of rows modified by the previous INSERT, UPDATE or DELETE
# statement within the same trigger.
#
reset_db
do_execsql_test 7.1 {
  CREATE TABLE q1(t);
  CREATE TABLE q2(u, v);
  CREATE TABLE q3(w);

  CREATE TRIGGER q2_insert BEFORE INSERT ON q2 BEGIN

    /* changes() returns value from previous I/U/D in callers context */
    INSERT INTO q1 VALUES('1:' || changes());

    /* changes() returns value of previous I/U/D in this context */
    INSERT INTO q3 VALUES(changes()), (2), (3);
    INSERT INTO q1 VALUES('2:' || changes());
    INSERT INTO q3 VALUES(changes() + 3), (changes()+4);
    SELECT 'this does not affect things!';
    INSERT INTO q1 VALUES('3:' || changes());
    UPDATE q3 SET w = w+10 WHERE w%2;
    INSERT INTO q1 VALUES('4:' || changes());
    DELETE FROM q3;
    INSERT INTO q1 VALUES('5:' || changes());
  END;
}

do_execsql_test 7.2 {
  INSERT INTO q2 VALUES('x', 'y');
  SELECT * FROM q1;
} {
  1:0   2:3   3:2   4:3   5:5
}

do_execsql_test 7.3 {
  DELETE FROM q1;
  INSERT INTO q2 VALUES('x', 'y');
  SELECT * FROM q1;
} {
  1:5   2:3   3:2   4:3   5:5
}



finish_test