_appendN($sql);
return ADODB_mssql::_query($sql,$inputarr);
}
/**
* This function will intercept all the literals used in the SQL, prepending the "N" char to them
* in order to allow mssql to store properly data sent in the correct UCS-2 encoding (by freeTDS
* and ODBTP) keeping SQL compatibility at ADOdb level (instead of hacking every project to add
* the "N" notation when working against MSSQL.
*
* Note that this hack only must be used if ALL the char-based columns in your DB are of type nchar,
* nvarchar and ntext
*/
function _appendN($sql) {
$result = $sql;
/// Check we have some single quote in the query. Exit ok.
if (strpos($sql, SINGLEQUOTE) === false) {
return $sql;
}
/// Check we haven't an odd number of single quotes (this can cause problems below
/// and should be considered one wrong SQL). Exit with debug info.
if ((substr_count($sql, SINGLEQUOTE) & 1)) {
if ($this->debug) {
ADOConnection::outp("{$this->databaseType} internal transformation: not converted. Wrong number of quotes (odd)");
}
return $sql;
}
/// Check we haven't any backslash + single quote combination. It should mean wrong
/// backslashes use (bad magic_quotes_sybase?). Exit with debug info.
$regexp = '/(\\\\' . SINGLEQUOTE . '[^' . SINGLEQUOTE . '])/';
if (preg_match($regexp, $sql)) {
if ($this->debug) {
ADOConnection::outp("{$this->databaseType} internal transformation: not converted. Found bad use of backslash + single quote");
}
return $sql;
}
/// Remove pairs of single-quotes
$pairs = array();
$regexp = '/(' . SINGLEQUOTE . SINGLEQUOTE . ')/';
preg_match_all($regexp, $result, $list_of_pairs);
if ($list_of_pairs) {
foreach (array_unique($list_of_pairs[0]) as $key=>$value) {
$pairs['<@#@#@PAIR-'.$key.'@#@#@>'] = $value;
}
if (!empty($pairs)) {
$result = str_replace($pairs, array_keys($pairs), $result);
}
}
/// Remove the rest of literals present in the query
$literals = array();
$regexp = '/(N?' . SINGLEQUOTE . '.*?' . SINGLEQUOTE . ')/is';
preg_match_all($regexp, $result, $list_of_literals);
if ($list_of_literals) {
foreach (array_unique($list_of_literals[0]) as $key=>$value) {
$literals['<#@#@#LITERAL-'.$key.'#@#@#>'] = $value;
}
if (!empty($literals)) {
$result = str_replace($literals, array_keys($literals), $result);
}
}
/// Analyse literals to prepend the N char to them if their contents aren't numeric
if (!empty($literals)) {
foreach ($literals as $key=>$value) {
if (!is_numeric(trim($value, SINGLEQUOTE))) {
/// Non numeric string, prepend our dear N
$literals[$key] = 'N' . trim($value, 'N'); //Trimming potentially existing previous "N"
}
}
}
/// Re-apply literals to the text
if (!empty($literals)) {
$result = str_replace(array_keys($literals), $literals, $result);
}
/// Re-apply pairs of single-quotes to the text
if (!empty($pairs)) {
$result = str_replace(array_keys($pairs), $pairs, $result);
}
/// Print transformation if debug = on
if ($result != $sql && $this->debug) {
ADOConnection::outp("{$this->databaseType} internal transformation:
{$sql}
to
{$result}");
}
return $result;
}
}
class ADORecordset_mssql_n extends ADORecordset_mssql {
var $databaseType = "mssql_n";
function ADORecordset_mssql_n($id,$mode=false)
{
$this->ADORecordset_mssql($id,$mode);
}
}
?>