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description of mysql_escape_string

mysql_escape_string escape a mysql string
” will be escaped ; will not be escaped

! mysql_escape_string is outdated use mysql_real_escape_string instead !

#include <stdio.h> /* including standard library */ 
#include <mysql/mysql.h>
MYSQL *my;
MYSQL_RES *result;
int main( void ){
char host[20];
char user[20];
char pass[20];
// variables for escape
char from[90];
char query[90];
char to[90];
unsigned int length = 0;
my = mysql_init(NULL);
if (my == NULL ) {
printf("Cant initalisize MySQL\n");
return 1;
if( mysql_real_connect (my,host,user,pass,NULL,0,NULL,0)  == NULL) {
  printf("Error cant login\n");
  } else {
  printf("Login correct\n");
mysql_select_db(my, "test");
// e.g. what the user send ... in this case a SQL injection
sprintf(from, "user1 ; SELECT * FROM usertable WHERE userid = \"user2\"");
length = strlen(from);
mysql_escape_string(to, from, length);
// new escaped string
sprintf(query, "SELECT id FROM usertable WHERE user_id = \"%s\"; ",to);
return 0;

output of mysql_escape_string c example

  Login correct
  SELECT id FROM usertable WHERE user_id = "user1 ; SELECT * FROM usertable WHERE userid = \"user2\"";

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c/mysql/mysql.h/mysql_escape_string.txt · Last modified: 2013/02/28 01:21 by

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