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Overview
Comment:Updates and clarifications to the built-in SQL function documentation. Mark key sentences in that documentation as requirements.
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 34346a758d4d4de6f7ba62d739a6bcd4ed93530f
User & Date: drh 2009-12-07 23:47:16
Context
2009-12-08
02:04
Further updates to the SQL function documentation. check-in: e265a59cf0 user: drh tags: trunk
2009-12-07
23:47
Updates and clarifications to the built-in SQL function documentation. Mark key sentences in that documentation as requirements. check-in: 34346a758d user: drh tags: trunk
20:51
Corresponding to SQLite version 3.6.21. check-in: 81b9488b48 user: drh tags: trunk, release
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application may define additional
functions written in C and added to the database engine using
the [sqlite3_create_function()] API.</p>

<table border=0 cellpadding=10>
<tcl>
funcdef {abs(X)} {} {
  ^Return the absolute value of the numeric
  argument <i>X</i>.  ^Return NULL if <i>X</i> is NULL.  ^Return 0.0 if
  <i>X</i> is not a numeric value.



}

funcdef {changes()} {} {
  Return the number of database rows that were changed or inserted or
  deleted by the most recently complete SQL.  This is a wrapper around
  the [sqlite3_changes()] C/C++ function.
}

funcdef {coalesce(X,Y,...)} {} {
  Return a copy of the first non-NULL argument.  If
  all arguments are NULL then NULL is returned.  There must be at least 
  2 arguments.
}

funcdef {glob(X,Y)} {} {
  This function is used to implement the
  "<b>Y GLOB X</b>" syntax of SQLite.
  Note that the X and Y arguments are reversed in the glob() function
  relative to the infix [GLOB] operator.
  The [sqlite3_create_function()]
  interface can
  be used to override this function and thereby change the operation
  of the [GLOB] operator.</td>
}

funcdef {ifnull(X,Y)} {} {
  Return a copy of the first non-NULL argument.  If
  both arguments are NULL then NULL is returned. The ifnull() functions and
  [coalesce()] with two arguments are interchangeable.</td>
}

funcdef {hex(X)} {} {
  The argument is interpreted as a BLOB.  The result
  is a hexadecimal rendering of the content of that blob.  

}

funcdef {last_insert_rowid()} {} {
  Return the [ROWID]
  of the last row insert from this
  connection to the database. 
  This is the same value that would be returned
  from the [sqlite3_last_insert_rowid()] API function.
}

funcdef {length(X)} {} {
  Return the string length of <i>X</i> in characters if <i>X</i> is a string,
  or in bytes if <i>X</i> is a blob.



}

funcdef {like(X,Y) like(X,Y,Z)} {} {

  This function is used to implement the "<b>Y LIKE X &#91;ESCAPE Z&#93;</b>"
  syntax of SQL. If the optional ESCAPE clause is present, then the
  user-function is invoked with three arguments. Otherwise, it is
  invoked with two arguments only. Note that the X and Y parameters are
  reversed in the like() function relative to the infix [LIKE] operator.
  The [sqlite3_create_function()] interface can be used to override this
  function and thereby change the operation of the
  [LIKE] operator. When doing this, it may be important

  to override both the two and three argument versions of the like() 
  function. Otherwise, different code may be called to implement the
  [LIKE] operator depending on whether or not an ESCAPE clause was 
  specified.
}

funcdef {load_extension(X) load_extension(X,Y)} {} {
  Load SQLite extensions out of the shared library
  file named <i>X</i> using the entry point <i>Y</i>.  The result
  is a NULL.  If <i>Y</i> is omitted then the default entry point
  of <b>sqlite3_extension_init</b> is used.  This function raises
  an exception if the extension fails to load or initialize correctly.

  <p>This function will fail if the extension attempts to modify
  or delete a SQL function or collating sequence.  The
  extension can add new functions or collating sequences, but cannot
  modify or delete existing functions or collating sequences because
  those functions and/or collating sequences might be used elsewhere
  in the currently running SQL statement.  To load an extension that
  changes or deletes functions or collating sequences, use the
  [sqlite3_load_extension()] C-language API.</p>
}

funcdef {lower(X)} {} {
  Return a copy of string <i>X</i> with all ASCII characters
  converted to lower case.  The default built-in lower() function works
  for ASCII characters only.  To do case conversions on non-ASCII
  characters, load the ICU extension.
}

funcdef {ltrim(X) ltrim(X,Y)} {} {
  Return a string formed by removing any and all
  characters that appear in <i>Y</i> from the left side of <i>X</i>.
  If the <i>Y</i> argument is omitted, spaces are removed.

}

funcdef {max(X,Y,...)} {*maxCoreFunc *max {max() SQL function}} {

  Return the argument with the maximum value.  Or return NULL if any argument
  is NULL.




  Note that <b>max()</b> is a simple function when
  it has 2 or more arguments but converts to an aggregate function if given
  only a single argument.
}

funcdef {min(X,Y,...)} {*minCoreFunc *min {min() SQL function}} {

  Return the argument with the minimum value. 




  Note that <b>min()</b> is a simple function when
  it has 2 or more arguments but converts to an aggregate function if given

  only a single argument.
}

funcdef {nullif(X,Y)} {} {
  Return the first argument if the arguments are different, 
  otherwise return NULL.




}

funcdef {quote(X)} {} {
  This routine returns a string which is the value of
  its argument suitable for inclusion into another SQL statement.
  Strings are surrounded by single-quotes with escapes on interior quotes
  as needed.  BLOBs are encoded as hexadecimal literals.
  SQLite uses this function internally in its implementation of [VACUUM]
  so if this function is overloading to provide incompatible behavior, the
  [VACUUM] command will likely cease to work.
}

funcdef {random()} {} {
  Return a pseudo-random integer
  between -9223372036854775808 and +9223372036854775807.
}

funcdef {randomblob(N)} {} {
  Return an <i>N</i>-byte blob containing pseudo-random bytes.
  <i>N</i> should be a postive integer.

  <p>Hint:  applications can generate globally unique identifiers
  using this function together with [hex()] and/or
  [lower()] like this:</p>

  <blockquote>
  hex(randomblob(16))<br></br>
  lower(hex(randomblob(16)))
  </blockquote>
}

funcdef {replace(X,Y,Z)} {} {
  Return a string formed by substituting string <i>Z</i> for
  every occurrance of string <i>Y</i> in string <i>X</i>.  The [BINARY]
  collating sequence is used for comparisons.  If <i>Y</i> is an empty
  string then return <i>X</i> unchanged.  If <i>Z</i> is not initially
  a string, it is cast to a UTF-8 string prior to processing.
}

funcdef {round(X) round(X,Y)} {} {
  Round off the number <i>X</i> to <i>Y</i> digits to the
  right of the decimal point.  If the <i>Y</i> argument is omitted, 0 is 
  assumed.
}

funcdef {rtrim(X) rtrim(X,Y)} {} {
  Return a string formed by removing any and all
  characters that appear in <i>Y</i> from the right side of <i>X</i>.
  If the <i>Y</i> argument is omitted, spaces are removed.

}

funcdef {soundex(X)} {} {

  Compute the soundex encoding of the string <i>X</i>.
  The string "?000" is returned if the argument is NULL.
  This function is omitted from SQLite by default.
  It is only available the -DSQLITE_SOUNDEX=1 compiler option
  is used when SQLite is built.
}

funcdef {sqlite_source_id()} {} {
  Return a string that identifies the specific version of the source code
  that was used to build the SQLite library.  The return string begins with

  the date and time that the source code was checked in and is follows by
  an SHA1 hash that uniquely identifies the source tree.  This function is
  an SQL wrapper around the [sqlite3_sourceid()] C interface.
}

funcdef {sqlite_version()} {} {
  Return the version string for the SQLite library
  that is running.  Example:  "3.5.9".  This function is an SQL
  wrapper around the [sqlite3_libversion()] C-interface.
}

funcdef {substr(X,Y,Z) substr(X,Y)} {} {
  Return a substring of input string <i>X</i> that begins
  with the <i>Y</i>-th character and which is <i>Z</i> characters long.
  If <i>Z</i> is omitted then all character through the end of the string
  are returned.
  The left-most character of <i>X</i> is number 1.  If <i>Y</i> is negative
  the the first character of the substring is found by counting from the
  right rather than the left.  If <i>Z</i> is negative then return
  the <i>Z</i> characters preceeding the <i>Y</i>-th character.
  If <i>X</i> is string then characters indices refer to actual UTF-8 
  characters.  If <i>X</i> is a BLOB then the indices refer to bytes.
}

funcdef {total_changes()} {} {

  Return the number of row changes caused by INSERT, UPDATE or DELETE
  statements since the current database connection was opened.
  This function is a wrapper around the [sqlite3_total_changes()]
  C/C++ interface.
}

funcdef {trim(X) trim(X,Y)} {} {
  Return a string formed by removing any and all
  characters that appear in <i>Y</i> from both ends of <i>X</i>.
  If the <i>Y</i> argument is omitted, spaces are removed.
}

funcdef {typeof(X)} {} {
  Return the [datatype] of the expression <i>X</i>.  The only 
  return values are "null", "integer", "real", "text", and "blob".
}

funcdef {upper(X)} {} {
  Return a copy of input string <i>X</i> converted to all
  upper-case letters.  The implementation of this function uses the C library
  routine <b>toupper()</b> which means it may not work correctly on 
  non-ASCII UTF-8 strings.
}

funcdef {zeroblob(N)} {} {
  Return a BLOB consisting of N bytes of 0x00.  SQLite
  manages these zeroblobs very efficiently.  Zeroblobs can be used to
  reserve space for a BLOB that is later written using 
  [sqlite3_blob_open() | incremental BLOB I/O].
  This SQL function is implemented using the [sqlite3_result_zeroblob()]
  routine from the C/C++ interface.
}
</tcl>
</table>

<tcl>
##############################################################################







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application may define additional
functions written in C and added to the database engine using
the [sqlite3_create_function()] API.</p>

<table border=0 cellpadding=10>
<tcl>
funcdef {abs(X)} {} {
  ^The abs(X) function returns the absolute value of the numeric
  argument X.  ^Abs(X) returns NULL if X is NULL. 
  ^(Abs(X) return 0.0 if X is a string or blob
  that cannot be converted to a numeric value.)^  ^If X is the 
  integer -9223372036854775807 then abs(X) throws an integer overflow
  error since there is no equivalent positive 64-bit two complement value.
}

funcdef {changes()} {} {
  ^The change() function returns the number of database rows that were changed
  or inserted or deleted by the most recently complete SQL.  
  ^This is a wrapper around the [sqlite3_changes()] C/C++ function.
}

funcdef {coalesce(X,Y,...)} {} {
  ^The coalesce() function returns a copy of its first non-NULL argument, or
  NULL if all arguments are NULL.  ^Coalesce() must be at least 
  2 arguments.
}

funcdef {glob(X,Y)} {} {
  ^The glob(X,Y) function is equivalent to the
  expression "<b>Y GLOB X</b>".
  Note that the X and Y arguments are reversed in the glob() function
  relative to the infix [GLOB] operator.
  ^If the [sqlite3_create_function()] interface is used to
  override the glob(X,Y) function with an alternative implementation then

  the [GLOB] operator will invoke the alternative implementation.
}

funcdef {ifnull(X,Y)} {} {
  ^The ifnull() function returns a copy of its first non-NULL argument, or
  NULL if both arguments are NULL.  ^Ifnull() must have exactly 2 arguments.
  ^The ifnull() function is equivalent to [coalesce()] with two arguments.
}

funcdef {hex(X)} {} {
  ^The hex() function interprets its argument as a BLOB and returns
  a string which is the upper-case hexadecimal rendering of the content of
  that blob.
}

funcdef {last_insert_rowid()} {} {
  ^The last_insert_rowid() function returns the [ROWID]
  of the last row insert from the database connection which invoked the
  function.
  ^The last_insert_rowid() SQL function is a wrapper around the
  [sqlite3_last_insert_rowid()] C/C++ interface function.
}

funcdef {length(X)} {} {
  ^The length(X) function returns the string length of X in 
  characters if X is a string, or in bytes if X is a blob.
  ^If X is NULL then length(X) is NULL.
  ^If X is numeric then length(X) returns the length of a string
  representation of X.
}

funcdef {like(X,Y) like(X,Y,Z)} {} {
  ^The like() function is used to implement the
  "<b>Y LIKE X &#91;ESCAPE Z&#93;</b>" expression. 
  ^If the optional ESCAPE clause is present, then the
  like() function is invoked with three arguments.  ^Otherwise, it is
  invoked with two arguments only. Note that the X and Y parameters are
  reversed in the like() function relative to the infix [LIKE] operator.
  ^The [sqlite3_create_function()] interface can be used to override the
  like() function and thereby change the operation of the

  [LIKE] operator.  When overriding the like() function, it may be important
  to override both the two and three argument versions of the like() 
  function. Otherwise, different code may be called to implement the
  [LIKE] operator depending on whether or not an ESCAPE clause was 
  specified.
}

funcdef {load_extension(X) load_extension(X,Y)} {} {
  ^The load_extension(X,Y) function loads SQLite extensions out of the shared
  library file named X using the entry point Y.  ^The result of load_extension()
  is always a NULL.  ^If Y is omitted then the default entry point
  of <b>sqlite3_extension_init</b> is used.  ^The load_extension() function
  raises an exception if the extension fails to load or initialize correctly.

  <p>^The load_extension() function will fail if the extension attempts to 
  modify or delete a SQL function or collating sequence.  ^The
  extension can add new functions or collating sequences, but cannot
  modify or delete existing functions or collating sequences because
  those functions and/or collating sequences might be used elsewhere
  in the currently running SQL statement.  To load an extension that
  changes or deletes functions or collating sequences, use the
  [sqlite3_load_extension()] C-language API.</p>
}

funcdef {lower(X)} {} {
  ^The lower(X) function returns a copy of string X with all ASCII characters
  converted to lower case.  ^The default built-in lower() function works
  for ASCII characters only.  To do case conversions on non-ASCII
  characters, load the ICU extension.
}

funcdef {ltrim(X) ltrim(X,Y)} {} {
  ^The ltrim(X,Y) function returns a string formed by removing any and all
  characters that appear in Y from the left side of X.
  ^If the Y argument is omitted, ltrim(X) removes spaces from the left side
  of X.
}

funcdef {max(X,Y,...)} {*maxCoreFunc *max {max() SQL function}} {
  ^The multi-argument max() function returns the argument with the 
  maximum value, or return NULL if any argument is NULL. 

  ^The multi-argument max() function searches its arguments from left to right
  for an argument that defines a collating function and uses that collating
  function for all string comparisons.  ^If none of the arguments to max()
  define a collating function, then the BINARY collating function is used.
  Note that <b>max()</b> is a simple function when
  it has 2 or more arguments but operates as an
  [minAggFunc | aggregate function] if given only a single argument.
}

funcdef {min(X,Y,...)} {*minCoreFunc *min {min() SQL function}} {
  ^The multi-argument min() function returns the argument with the
  minimum value.
  ^The multi-argument min() function searches its arguments from left to right
  for an argument that defines a collating function and uses that collating
  function for all string comparisons.  ^If none of the arguments to min()
  define a collating function, then the BINARY collating function is used.
  Note that <b>min()</b> is a simple function when
  it has 2 or more arguments but operates as an 
  [maxAggFunc | aggregate function] if given
  only a single argument.
}

funcdef {nullif(X,Y)} {} {
  ^The nullif(X,Y) function returns its first argument if the arguments are
  different and NULL if the arguments are the same.  The nullif(X,Y) function
  searches its arguments from left to right for an argument that defines a
  collating function and uses that collating function for all string
  comparisons.  ^If neither argument to nullif() defines a collating function
  then the BINARY is used.
}

funcdef {quote(X)} {} {
  ^The quote(X) function returns a string which is the value of
  its argument suitable for inclusion into another SQL statement.
  Strings are surrounded by single-quotes with escapes on interior quotes
  as needed.  BLOBs are encoded as hexadecimal literals.



}

funcdef {random()} {} {
  ^The random() function returns a pseudo-random integer
  between -9223372036854775808 and +9223372036854775807.
}

funcdef {randomblob(N)} {} {
  ^The randomblob(N) function return an N-byte blob containing pseudo-random
  bytes. ^If N is less than 1 then a 1-byte random blob is returned.

  <p>Hint:  applications can generate globally unique identifiers
  using this function together with [hex()] and/or
  [lower()] like this:</p>

  <blockquote>
  hex(randomblob(16))<br></br>
  lower(hex(randomblob(16)))
  </blockquote>
}

funcdef {replace(X,Y,Z)} {} {
  ^The replace(X,Y,Z) function returns a string formed by substituting
  string Z for every occurrance of string Y in string X.  ^The [BINARY]
  collating sequence is used for comparisons.  ^If Y is an empty
  string then return X unchanged.  ^If Z is not initially
  a string, it is cast to a UTF-8 string prior to processing.
}

funcdef {round(X) round(X,Y)} {} {
  ^The round(X,Y) function returns a string representation of the floating-point
  value X rounded to Y digits to the right of the decimal point.
  ^If the Y argument is omitted, the X value is truncated to an integer.
}

funcdef {rtrim(X) rtrim(X,Y)} {} {
  ^The rtrim(X,Y) function returns a string formed by removing any and all
  characters that appear in Y from the right side of X.
  ^If the Y argument is omitted, rtrim(X) removes spaces from the right
  side of X.
}

funcdef {soundex(X)} {} {
  ^The soundex(X) function returns a string that is the soundex encoding 
  of the string X.
  ^The string "?000" is returned if the argument is NULL.
  This function is omitted from SQLite by default.
  It is only available if the -DSQLITE_SOUNDEX=1 compiler option
  is used when SQLite is built.
}

funcdef {sqlite_source_id()} {} {
  ^The sqlite_source_id() function returns a string that identifies the
  specific version of the source code that was used to build the SQLite
  library.  ^The string returned by sqlite_source_id() begins with
  the date and time that the source code was checked in and is follows by
  an SHA1 hash that uniquely identifies the source tree.  ^This function is
  an SQL wrapper around the [sqlite3_sourceid()] C interface.
}

funcdef {sqlite_version()} {} {
  ^The sqlite_version() function returns the version string for the SQLite
  library that is running.  ^This function is an SQL
  wrapper around the [sqlite3_libversion()] C-interface.
}

funcdef {substr(X,Y,Z) substr(X,Y)} {} {
  ^The substr(X,Y,Z) function returns a substring of input string X that begins
  with the Y-th character and which is Z characters long.
  ^If Z is omitted then substr(X,Y) returns all character through the end
  of the string X beginning with the Y-th.
  ^The left-most character of X is number 1.  ^If Y is negative
  the the first character of the substring is found by counting from the
  right rather than the left.  ^If Z is negative then
  the abs(Z) characters preceeding the Y-th character are returned.
  ^If X is string then characters indices refer to actual UTF-8 
  characters.  ^If X is a BLOB then the indices refer to bytes.
}

funcdef {total_changes()} {} {
  ^The total_changes() function returns the number of row changes
  caused by INSERT, UPDATE or DELETE
  statements since the current database connection was opened.
  ^This function is a wrapper around the [sqlite3_total_changes()]
  C/C++ interface.
}

funcdef {trim(X) trim(X,Y)} {} {
  ^The trim(X,Y) function returns a string formed by removing any and all
  characters that appear in Y from both ends of X.
  ^If the Y argument is omitted, trim(X) removes spaces from both ends of X.
}

funcdef {typeof(X)} {} {
  ^The typeof(X) function returns a string that indicates the [datatype] of
  the expression X: "null", "integer", "real", "text", or "blob".
}

funcdef {upper(X)} {} {
  ^The upper(X) function returns a copy of input string X in which all 
  lower-case ASCII characters are converted to their upper-case equivalent.


}

funcdef {zeroblob(N)} {} {
  ^The zeroblob(N) function returns a BLOB consisting of N bytes of 0x00.
  SQLite manages these zeroblobs very efficiently.  Zeroblobs can be used to
  reserve space for a BLOB that is later written using 
  [sqlite3_blob_open() | incremental BLOB I/O].
  ^This SQL function is implemented using the [sqlite3_result_zeroblob()]
  routine from the C/C++ interface.
}
</tcl>
</table>

<tcl>
##############################################################################

Changes to scan_test_cases.tcl.

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set FILELIST [lrange $argv 1 end]
sqlite3 db docinfo.db

proc output_one_record {} {
  global filename linenumber type requirement SRCCAT SRCCLASS
  regsub -all {\s+} [string trim $requirement] { } requirement
  regsub -all {\s?\*/$} $requirement {} requirement
  regexp {(R-[-\d]+)\s*(.*)} $requirement all reqno reqtext


  if {$reqtext!=""} {
    set nreqno R-[md5-10x8 $reqtext]
    if {[string match $reqno* $nreqno]} {
      set reqno $nreqno
    } else {
      puts stderr "$filename:$linenumber: requirement number mismatch;\
                   $reqno should be $nreqno"







|
>
>







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set FILELIST [lrange $argv 1 end]
sqlite3 db docinfo.db

proc output_one_record {} {
  global filename linenumber type requirement SRCCAT SRCCLASS
  regsub -all {\s+} [string trim $requirement] { } requirement
  regsub -all {\s?\*/$} $requirement {} requirement
  if {![regexp {(R-[-\d]+)\s*(.*)} $requirement all reqno reqtext]} {
    return
  }
  if {$reqtext!=""} {
    set nreqno R-[md5-10x8 $reqtext]
    if {[string match $reqno* $nreqno]} {
      set reqno $nreqno
    } else {
      puts stderr "$filename:$linenumber: requirement number mismatch;\
                   $reqno should be $nreqno"