net sql injection prevention

: This article mainly introduces PHP to prevent SQL injection. For more information about PHP tutorials, see. SQL injection is generally caused by the inaccuracy of the syntax. The problem occurs in SQL statements, and the decisive one is quote ('). As follows:$

Php prevents SQL injection. Because SQL injection is required to operate on the database, it generally looks for SQL statement keywords: insert, delete, update, and select to check whether the passed variable parameters are controllable, whether

knowledge-based pattern matching IDs can be avoided.5. disassemble the string through the "+" sign and bypass it,For example, or 'sword' = 'sw '+ 'ords'; Exec ('in' + 'sert into' + '..... ')6. bypass through like, for example, or 'sword' like 'sw'7. bypass through in, such as or 'sword' in ('sword ')8. bypass through between, for example, or 'sword' between 'rw 'and 'tw'9. Pass> or Or 'sword'> 'sw'Or 'sword' Or 1 10. Bypass Using comment statements:Use/**/to replace spaces, such:Union/**/select

dynamic table names and column names, you can only use parameter formats such as "${xxx}".When writing MyBatis mapping statements, use the format "#{xxx}" as much as possible. If you have to use parameters such as "${xxx}", do the filtering work manually to prevent SQL injection attacks.　Java code and your original similar, in fact, nothing bad, you have to feel trouble to judge null and '% ' package into

SQL injection usually occurs because the syntax is not rigorous, the problem occurs on the SQL statement, and the decisive is quote ('). As follows:$sql = "delete from table where id ='$id'" ;The normal commit is to delete a piece of data, if the ID is submitted (1 ' or 1 #), then the

Add a reference. System Configuration Configurationmanager.appsettings[""] Configurationmanager.connecsring[""]. ConnectionString Excutescalar (); SqlDataReader Reader=excutereader (); Reader pointer, pointing to table header Reader. Read (); producer Consumer problems --The connection pool of SQL connection Httoapplication —————— Object Pooling Technology add config file inside app. while (reader. Read ()) {

for SQL Injection String [] strchar = {"and", "EXEC", "insert", "select", "Update", "delete", "Count", "from ", "Drop", "ASC", "or", "char", "% ",";",":","\'","\"", "-", "CHR", "Master", "mid", "truncate", "declare", "char", "sitename", "/Add ", "xp_cmdshell", "Net user", "net localgroup Administrators", "Exec master.

continue running the subsequent program logic if the attacker enters the following URL: http://www.----------------------? personid=6414 or 2=2 The SQL statements are grouped as follows: select * FROM table name where userid=1433620 and addrcontactid=6414 or 2=2 Prevention methods SQL injection vulnerabil

knowledge-based pattern matching IDS can be avoided.5. disassemble the string through the "+" sign and bypass it,For example, or 'sword' = 'sw '+ 'ords'; EXEC ('in' + 'sert into' + '..... ')6. bypass through LIKE, for example, or 'sword' LIKE 'sw'7. bypass through IN, such as or 'sword' IN ('sword ')8. bypass through BETWEEN, for example, or 'sword' BETWEEN 'rw 'AND 'tw'9. Pass> or Or 'sword'> 'sw'Or 'sword' Or 1 10. Bypass Using comment statements:Use/**/to replace spaces, such:UNION/**/SELECT

first user name in the table. Attackers can use the same SQL injection, replace username with password to get the password of the user account, and so on, and obtain each record in the database table.3) Use '-- or' or 1 = 1 -- shorten query ConditionsSelect username from usersWhere username = 'admin' -- 'and Password = '201312'4) modify the database table content:The attacker ends a query statement using

Document directory Principles of SQL Injection Previous defense methods Parameterized Query The SQL injection vulnerability was once a nightmare for Web applications, and none of CMS, BBS, and Blog were affected.Principles of SQL