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

Artifact 9e7f78402005e833af71dcab32d048003869eca5abcaccc985d4f8dc1d86bcc7:


# 2002 May 10
#
# 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.
#
# This file implements tests for the SQLITE_MISUSE detection logic.
# This test file leaks memory and file descriptors.
#
# $Id: misuse.test,v 1.11 2006/01/03 00:33:50 drh Exp $

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

proc catchsql2 {sql} {
  set r [
    catch {
      set res [list]
      db eval $sql data {
        if { $res==[list] } {
          foreach f $data(*) {lappend res $f}
        }
        foreach f $data(*) {lappend res $data($f)}
      }
      set res
    } msg
  ]
  lappend r $msg
}


# Make sure the test logic works
#
do_test misuse-1.1 {
  db close
  catch {forcedelete test2.db}
  catch {forcedelete test2.db-journal}
  sqlite3 db test2.db; set ::DB [sqlite3_connection_pointer db]
  execsql {
    CREATE TABLE t1(a,b);
    INSERT INTO t1 VALUES(1,2);
  }
  catchsql2 {
    SELECT * FROM t1
  }
} {0 {a b 1 2}}
do_test misuse-1.2 {
  catchsql2 {
    SELECT x_coalesce(NULL,a) AS 'xyz' FROM t1
  }
} {1 {no such function: x_coalesce}}
do_test misuse-1.3 {
  sqlite3_create_function $::DB
  catchsql2 {
    SELECT x_coalesce(NULL,a) AS 'xyz' FROM t1
  }
} {0 {xyz 1}}

# Use the x_sqlite_exec() SQL function to simulate the effect of two
# threads trying to use the same database at the same time.
#
# It used to be prohibited to invoke sqlite_exec() from within a function,
# but that has changed.  The following tests used to cause errors but now
# they do not.
#
ifcapable {utf16} {
  do_test misuse-1.4 {
    catchsql2 {
       SELECT x_sqlite_exec('SELECT * FROM t1') AS xyz;
    } 
  } {0 {xyz {1 2}}}
}
do_test misuse-1.5 {
  catchsql2 {SELECT * FROM t1}
} {0 {a b 1 2}}
do_test misuse-1.6 {
  catchsql {
    SELECT * FROM t1
  }
} {0 {1 2}}

# Attempt to register a new SQL function while an sqlite_exec() is active.
#
do_test misuse-2.1 {
  db close
  sqlite3 db test2.db; set ::DB [sqlite3_connection_pointer db]
  execsql {
    SELECT * FROM t1
  }
} {1 2}
do_test misuse-2.2 {
  catchsql2 {SELECT * FROM t1}
} {0 {a b 1 2}}

# We used to disallow creating new function from within an exec().
# But now this is acceptable.
do_test misuse-2.3 {
  set v [catch {
    db eval {SELECT * FROM t1} {} {
      sqlite3_create_function $::DB
    }
  } msg]
  lappend v $msg
} {0 {}}
do_test misuse-2.4 {
  catchsql2 {SELECT * FROM t1}
} {0 {a b 1 2}}
do_test misuse-2.5 {
  catchsql {
    SELECT * FROM t1
  }
} {0 {1 2}}

# Attempt to register a new SQL aggregate while an sqlite_exec() is active.
#
do_test misuse-3.1 {
  db close
  sqlite3 db test2.db; set ::DB [sqlite3_connection_pointer db]
  execsql {
    SELECT * FROM t1
  }
} {1 2}
do_test misuse-3.2 {
  catchsql2 {SELECT * FROM t1}
} {0 {a b 1 2}}

# We used to disallow creating new function from within an exec().
# But now this is acceptable.
do_test misuse-3.3 {
  set v [catch {
    db eval {SELECT * FROM t1} {} {
      sqlite3_create_aggregate $::DB
    }
  } msg]
  lappend v $msg
} {0 {}}
do_test misuse-3.4 {
  catchsql2 {SELECT * FROM t1}
} {0 {a b 1 2}}
do_test misuse-3.5 {
  catchsql {
    SELECT * FROM t1
  }
} {0 {1 2}}

# Attempt to close the database from an sqlite_exec callback.
#
# Update for v3: The db cannot be closed because there are active
# VMs. The sqlite3_close call would return SQLITE_BUSY.
do_test misuse-4.1 {
  db close
  sqlite3 db test2.db; set ::DB [sqlite3_connection_pointer db]
  execsql {
    SELECT * FROM t1
  }
} {1 2}
do_test misuse-4.2 {
  catchsql2 {SELECT * FROM t1}
} {0 {a b 1 2}}
do_test misuse-4.3 {
  set v [catch {
    db eval {SELECT * FROM t1} {} {
      set r [sqlite3_close $::DB]
    }
  } msg]
  lappend v $msg $r
} {0 {} SQLITE_BUSY}

if {[clang_sanitize_address]==0} {
  do_test misuse-4.4 {
  # Flush the TCL statement cache here, otherwise the sqlite3_close() will
  # fail because there are still un-finalized() VDBEs.
    db cache flush
      sqlite3_close $::DB
      catchsql2 {SELECT * FROM t1}
  } {1 {bad parameter or other API misuse}}
  do_test misuse-4.5 {
    catchsql {
      SELECT * FROM t1
    }
  } {1 {bad parameter or other API misuse}}

  # Attempt to use a database after it has been closed.
  #
  do_test misuse-5.1 {
    db close
      sqlite3 db test2.db; set ::DB [sqlite3_connection_pointer db]
      execsql {
        SELECT * FROM t1
      }
  } {1 2}
  do_test misuse-5.2 {
    catchsql2 {SELECT * FROM t1}
  } {0 {a b 1 2}}
  do_test misuse-5.3 {
    db close
      set r [catch {
        sqlite3_prepare $::DB {SELECT * FROM t1} -1 TAIL
      } msg]
    lappend r $msg
  } {1 {(21) bad parameter or other API misuse}}
}

finish_test