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

Artifact a0f5b16a2df44dd0b15751787130af2183167c0c:


# 2011 January 27
#
# 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 script is testing the FTS3 module.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable !fts3 { finish_test ; return }
set ::testprefix fts3comp1

# Create a pretend compression system. 
#
# Each time the [zip] function is called, an entry is added to the ::strings
# array mapping from an integer key to the string argument to zip. The key
# is returned. Later on, when the key is passed to [unzip], the original
# string is retrieved from the ::strings array and returned.
#
set next_x 0
proc zip {x} {
 incr ::next_x
 set ::strings($::next_x) $x
 return $::next_x
}
proc unzip {x} {
  return $::strings($x)
}

foreach {tn zip unzip} {
  1   zip   unzip
  2   {z.i.p!!}    {un "zip"}
} {

  set next_x 0
  catch {db close}
  forcedelete test.db
  sqlite3 db test.db
  db func $zip zip
  db func $unzip unzip
  
  # Create a table that uses zip/unzip. Check that content inserted into
  # the table can be read back (using a full-scan query). Check that the
  # underlying %_content table contains the compressed (integer) values.
  #
  do_execsql_test 1.$tn.0 "
    CREATE VIRTUAL TABLE t1 USING fts4(
      a, b, 
      compress='$zip', uncompress='$unzip'
    );
  "
  do_execsql_test 1.$tn.1 {
    INSERT INTO t1 VALUES('one two three', 'two four six');
    SELECT a, b FROM t1;
  } {{one two three} {two four six}}
  do_execsql_test 1.$tn.2 {
    SELECT c0a, c1b FROM t1_content;
  } {1 2}
  
  # Insert another row and check that it can be read back. Also that the
  # %_content table still contains all compressed content. This time, try
  # full-text index and by-docid queries too.
  #
  do_execsql_test 1.$tn.3 {
    INSERT INTO t1 VALUES('three six nine', 'four eight twelve');
    SELECT a, b FROM t1;
  } {{one two three} {two four six} {three six nine} {four eight twelve}}
  do_execsql_test 1.$tn.4 {
    SELECT c0a, c1b FROM t1_content;
  } {1 2 3 4}
  
  do_execsql_test 1.$tn.5 {
    SELECT a, b FROM t1 WHERE docid = 2
  } {{three six nine} {four eight twelve}}
  do_execsql_test 1.$tn.6 {
    SELECT a, b FROM t1 WHERE t1 MATCH 'two'
  } {{one two three} {two four six}}
  
  # Delete a row and check that the full-text index is correctly updated.
  # Inspect the full-text index using an fts4aux table.
  #
  do_execsql_test 1.$tn.7 {
    CREATE VIRTUAL TABLE terms USING fts4aux(t1);
    SELECT term, documents, occurrences FROM terms WHERE col = '*';
  } {
    eight 1 1    four 2 2    nine 1 1    one 1 1 
    six 2 2      three 2 2   twelve 1 1  two 1 2
  }
  do_execsql_test 1.$tn.8 {
    DELETE FROM t1 WHERE docid = 1;
    SELECT term, documents, occurrences FROM terms WHERE col = '*';
  } {
    eight 1 1   four 1 1    nine 1 1 
    six 1 1     three 1 1   twelve 1 1
  }
  do_execsql_test 1.$tn.9 { SELECT c0a, c1b FROM t1_content } {3 4}
}

# Test that is an error to specify just one of compress and uncompress.
#
do_catchsql_test 2.1 {
  CREATE VIRTUAL TABLE t2 USING fts4(x, compress=zip)
} {1 {missing uncompress parameter in fts4 constructor}}
do_catchsql_test 2.2 {
  CREATE VIRTUAL TABLE t2 USING fts4(x, uncompress=unzip)
} {1 {missing compress parameter in fts4 constructor}}

finish_test