bigrow.test

sqlite-3.4.1,嵌入式数据库.是一个功能强大的开源数据库,给学习和研发以及小型公司的发展带来了全所未有的好处.

# 2001 September 23
#
# 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.  The
# focus of this file is stressing the library by putting large amounts
# of data in a single row of a table.
#
# $Id: bigrow.test,v 1.5 2004/08/07 23:54:48 drh Exp $

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

# Make a big string that we can use for test data
#
do_test bigrow-1.0 {
  set ::bigstr {}
  for {set i 1} {$i<=9999} {incr i} {
    set sep [string index "abcdefghijklmnopqrstuvwxyz" [expr {$i%26}]]
    append ::bigstr "$sep [format %04d $i] "
  }
  string length $::bigstr
} {69993}

# Make a table into which we can insert some but records.
#
do_test bigrow-1.1 {
  execsql {
    CREATE TABLE t1(a text, b text, c text);
    SELECT name FROM sqlite_master
      WHERE type='table' OR type='index'
      ORDER BY name
  }
} {t1}

do_test bigrow-1.2 {
  set ::big1 [string range $::bigstr 0 65519]
  set sql "INSERT INTO t1 VALUES('abc',"
  append sql "'$::big1', 'xyz');"
  execsql $sql
  execsql {SELECT a, c FROM t1}
} {abc xyz}
do_test bigrow-1.3 {
  execsql {SELECT b FROM t1}
} [list $::big1]
do_test bigrow-1.4 {
  set ::big2 [string range $::bigstr 0 65520]
  set sql "INSERT INTO t1 VALUES('abc2',"
  append sql "'$::big2', 'xyz2');"
  set r [catch {execsql $sql} msg]
  lappend r $msg
} {0 {}}
do_test bigrow-1.4.1 {
  execsql {SELECT b FROM t1 ORDER BY c}
} [list $::big1 $::big2]
do_test bigrow-1.4.2 {
  execsql {SELECT c FROM t1 ORDER BY c}
} {xyz xyz2}
do_test bigrow-1.4.3 {
  execsql {DELETE FROM t1 WHERE a='abc2'}
  execsql {SELECT c FROM t1}
} {xyz}

do_test bigrow-1.5 {
  execsql {
    UPDATE t1 SET a=b, b=a;
    SELECT b,c FROM t1
  }
} {abc xyz}
do_test bigrow-1.6 {
  execsql {
    SELECT * FROM t1
  }
} [list $::big1 abc xyz]
do_test bigrow-1.7 {
  execsql {
    INSERT INTO t1 VALUES('1','2','3');
    INSERT INTO t1 VALUES('A','B','C');
    SELECT b FROM t1 WHERE a=='1';
  }
} {2}
do_test bigrow-1.8 {
  execsql "SELECT b FROM t1 WHERE a=='$::big1'"
} {abc}
do_test bigrow-1.9 {
  execsql "SELECT b FROM t1 WHERE a!='$::big1' ORDER BY a"
} {2 B}

# Try doing some indexing on big columns
#
do_test bigrow-2.1 {
  execsql {
    CREATE INDEX i1 ON t1(a)
  }
  execsql "SELECT b FROM t1 WHERE a=='$::big1'"
} {abc}
do_test bigrow-2.2 {
  execsql {
    UPDATE t1 SET a=b, b=a
  }
  execsql "SELECT b FROM t1 WHERE a=='abc'"
} [list $::big1]
do_test bigrow-2.3 {
  execsql {
    UPDATE t1 SET a=b, b=a
  }
  execsql "SELECT b FROM t1 WHERE a=='$::big1'"
} {abc}
catch {unset ::bigstr}
catch {unset ::big1}
catch {unset ::big2}

# Mosts of the tests above were created back when rows were limited in
# size to 64K.  Now rows can be much bigger.  Test that logic.  Also
# make sure things work correctly at the transition boundries between
# row sizes of 256 to 257 bytes and from 65536 to 65537 bytes.
#
# We begin by testing the 256..257 transition.
#
do_test bigrow-3.1 {
  execsql {
    DELETE FROM t1;
    INSERT INTO t1(a,b,c) VALUES('one','abcdefghijklmnopqrstuvwxyz0123','hi');
  }
  execsql {SELECT a,length(b),c FROM t1}
} {one 30 hi}
do_test bigrow-3.2 {
  execsql {
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
  }
  execsql {SELECT a,length(b),c FROM t1}
} {one 240 hi}
for {set i 1} {$i<10} {incr i} {
  do_test bigrow-3.3.$i {
    execsql "UPDATE t1 SET b=b||'$i'"
    execsql {SELECT a,length(b),c FROM t1}
  } "one [expr {240+$i}] hi"
}

# Now test the 65536..65537 row-size transition.
#
do_test bigrow-4.1 {
  execsql {
    DELETE FROM t1;
    INSERT INTO t1(a,b,c) VALUES('one','abcdefghijklmnopqrstuvwxyz0123','hi');
  }
  execsql {SELECT a,length(b),c FROM t1}
} {one 30 hi}
do_test bigrow-4.2 {
  execsql {
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
    UPDATE t1 SET b=b||b;
  }
  execsql {SELECT a,length(b),c FROM t1}
} {one 122880 hi}
do_test bigrow-4.3 {
  execsql {
    UPDATE t1 SET b=substr(b,1,65515)
  }
  execsql {SELECT a,length(b),c FROM t1}
} {one 65515 hi}
for {set i 1} {$i<10} {incr i} {
  do_test bigrow-4.4.$i {
    execsql "UPDATE t1 SET b=b||'$i'"
    execsql {SELECT a,length(b),c FROM t1}
  } "one [expr {65515+$i}] hi"
}

# Check to make sure the library recovers safely if a row contains
# too much data.
#
do_test bigrow-5.1 {
  execsql {
    DELETE FROM t1;
    INSERT INTO t1(a,b,c) VALUES('one','abcdefghijklmnopqrstuvwxyz0123','hi');
  }
  execsql {SELECT a,length(b),c FROM t1}
} {one 30 hi}
set i 1
for {set sz 60} {$sz<1048560} {incr sz $sz} {
  do_test bigrow-5.2.$i {
    execsql {
      UPDATE t1 SET b=b||b;
      SELECT a,length(b),c FROM t1;
    }
  } "one $sz hi"
  incr i
}
do_test bigrow-5.3 {
  catchsql {UPDATE t1 SET b=b||b}
} {0 {}}
do_test bigrow-5.4 {
  execsql {SELECT length(b) FROM t1}
} 1966080
do_test bigrow-5.5 {
  catchsql {UPDATE t1 SET b=b||b}
} {0 {}}
do_test bigrow-5.6 {
  execsql {SELECT length(b) FROM t1}
} 3932160
do_test bigrow-5.99 {
  execsql {DROP TABLE t1}
} {}

finish_test