MySQL: Speed up updating rows without numeric or UTF-8 primary key

adminer/drivers/mssql.inc.php

@@ -375,10 +375,6 @@ WHERE OBJECT_NAME(i.object_id) = " . q($table)
 		return nl_br(h(preg_replace('~^(\\[[^]]*])+~m', '', $connection->error)));
 	}
 	
-	function exact_value($val) {
-		return q($val);
-	}
-
 	function create_database($db, $collation) {
 		return queries("CREATE DATABASE " . idf_escape($db) . (eregi('^[a-z0-9_]+$', $collation) ? " COLLATE $collation" : ""));
 	}

adminer/drivers/mysql.inc.php

@@ -532,14 +532,6 @@ if (!defined("DRIVER")) {
 		}
 	}
 
-	/** Return expression for binary comparison
-	* @param string
-	* @return string
-	*/
-	function exact_value($val) {
-		return q($val) . " COLLATE utf8_bin";
-	}
-
 	/** Create database
 	* @param string
 	* @param string
@@ -983,7 +975,7 @@ if (!defined("DRIVER")) {
 			$return = "UNHEX($return)";
 		}
 		if ($field["type"] == "bit") {
-			return "CONV($return, 2, 10) + 0";
+			$return = "CONV($return, 2, 10) + 0";
 		}
 		if (ereg("geometry|point|linestring|polygon", $field["type"])) {
 			$return = "GeomFromText($return)";

adminer/drivers/oracle.inc.php

@@ -270,10 +270,6 @@ ORDER BY uc.constraint_type, uic.column_position", $connection2) as $row) {
 		return h($connection->error); //! highlight sqltext from offset
 	}
 	
-	function exact_value($val) {
-		return q($val);
-	}
-	
 	function explain($connection, $query) {
 		$connection->query("EXPLAIN PLAN FOR $query");
 		return $connection->query("SELECT * FROM plan_table");

adminer/drivers/pgsql.inc.php

@@ -326,10 +326,6 @@ ORDER BY conkey, conname") as $row) {
 		return nl_br($return);
 	}
 	
-	function exact_value($val) {
-		return q($val);
-	}
-	
 	function create_database($db, $collation) {
 		return queries("CREATE DATABASE " . idf_escape($db) . ($collation ? " ENCODING " . idf_escape($collation) : ""));
 	}

adminer/drivers/sqlite.inc.php

@@ -348,10 +348,6 @@ if (isset($_GET["sqlite"]) || isset($_GET["sqlite2"])) {
 		return h($connection->error);
 	}
 	
-	function exact_value($val) {
-		return q($val);
-	}
-	
 	function check_sqlite_name($name) {
 		// avoid creating PHP files on unsecured servers
 		global $connection;

adminer/include/functions.inc.php

@@ -333,9 +333,16 @@ function where($where, $fields = array()) {
 	$function_pattern = '(^[\w\(]+' . str_replace("_", ".*", preg_quote(idf_escape("_"))) . '\)+$)'; //! columns looking like functions
 	foreach ((array) $where["where"] as $key => $val) {
 		$key = bracket_escape($key, 1); // 1 - back
-		$return[] = (preg_match($function_pattern, $key) ? $key : idf_escape($key)) //! SQL injection
+		$column = (preg_match($function_pattern, $key) ? $key : idf_escape($key)); //! SQL injection
-			. (($jush == "sql" && ereg('\\.', $val)) || $jush == "mssql" ? " LIKE " . exact_value(addcslashes($val, "%_\\")) : " = " . unconvert_field($fields[$key], exact_value($val))) // LIKE because of floats, but slow with ints, in MS SQL because of text
+		$return[] = $column
+			. (($jush == "sql" && ereg('^[0-9]*\\.[0-9]*$', $val)) || $jush == "mssql"
+				? " LIKE " . q(addcslashes($val, "%_\\"))
+				: " = " . unconvert_field($fields[$key], q($val))
+			) // LIKE because of floats but slow with ints, in MS SQL because of text
 		; //! enum and set
+		if ($jush == "sql" && ereg("[^ -@]", $val)) { // not just [a-z] to catch non-ASCII characters
+			$return[] = "$column = " . q($val) . " COLLATE utf8_bin";
+		}
 	}
 	foreach ((array) $where["null"] as $key) {
 		$return[] = idf_escape($key) . " IS NULL";

changes.txt

@@ -5,6 +5,7 @@ Don't use LIMIT 1 if inline updating unique row
 Don't check previous checkbox on added column in create table (bug #3614245)
 Order table list by name
 Verify UTF-8 encoding of CSV import
+MySQL: Speed up updating rows without numeric or UTF-8 primary key
 PostgreSQL: Fix detecting oid column in PDO
 PostgreSQL: Handle timestamp types (bug #3614086)
 Add Korean translation

editor/include/adminer.inc.php

@@ -143,7 +143,7 @@ ORDER BY ORDINAL_POSITION", null, "") as $row) { //! requires MySQL 5
 				// find all used ids
 				$ids = array();
 				foreach ($rows as $row) {
-					$ids[$row[$key]] = exact_value($row[$key]);
+					$ids[$row[$key]] = q($row[$key]);
 				}
 				// uses constant number of queries to get the descriptions, join would be complex, multiple queries would be slow
 				$descriptions = $this->_values[$table];

todo.txt

@@ -21,7 +21,6 @@ Rank, Tree structure
 
 MySQL:
 Data longer than max_allowed_packet can be sent by mysqli_stmt_send_long_data()
-COLLATE utf8_bin comparison doesn't use index with other than UTF-8 columns
 
 SQLite:
 Copy tables