Prevent SQL injection

When using Hash Variable that uses URL parameter or user-inputted value in the SQL query, ensure that these hash variable(s) are escaped in the query!

Make use of hash variable escape keywords, see Hash Variable - Escaping the Resultant Hash Variable.

Example of VULNERABLE query:

SELECT * FROM app_fd_sample_table WHERE c_value = '#requestParam.id#'

To fix this, use ?sql hash variable escape:

SELECT * FROM app_fd_sample_table WHERE c_value = '#requestParam.id?sql#'

Introduction

Database SQL Query List Action allows you to perform SQL queries on one (a row action) or more records (a bulk action) in your datalist. You can specify which database to perform the SQL function, either the current Joget database (default datasource) or a custom datasource (external database).

Database SQL Query List Action can be used to delete records or perform an update on one or more records based on user selection in the datalist checkboxes.

Database SQL Query List Action Properties

Configure Database SQL Query List Action

Figure 1 : Database SQL Query Action Menu

Figure 2 : Database SQL Query List Action
Properties

NameDescription
Label

Datalist button label.

Confirmation Message

Confirmation message before performing action, for example "Are you sure?".

Datasource

Target database to execute SQL statements on.

Choices:-

  • Custom Datasource
    • JDBC Connection Parameters are needed for this choice.
  • Default Datasource
    • Points to the current database your copy of Joget currently connects to.
Custom JDBC Driver

JDBC driver name.

Example values:

  • com.mysql.jdbc.Driver (MySQL)
  • oracle.jdbc.driver.OracleDriver (Oracle)
  • com.microsoft.sqlserver.jdbc.SQLServerDriver (Microsoft SQL Server)

Only applicable to "Custom Datasource" option.

Custom JDBC URL

Database connection URL.

Example: jdbc:mysql://localhost:3306/jwdb

Only applicable to "Custom Datasource" option.

Custom JDBC Username

Database username.

Example: root

Only applicable to "Custom Datasource" option.

Custom JDBC Password

Specified database user's password.

Only applicable to "Custom Datasource" option.

Test the connection parameters

Click on the "Test Connection" button at the bottom of the page to quickly test out your configurations.

Query

If a column name contains reserved keywords, do ensure it is encapsulated properly.

For example for MySQL, if the column identifier itself contains a dot symbol ( . ), it should be encapsulated like this:

SELECT `myAppName.myColumn` FROM app_fd_myTable;

Insert your SQL statement here. Use syntax like {id} in query to inject the selected row key. Use {uuid} to generate a unique id (or primary key). Examples:

Example
INSERT INTO
   app_fd_sample (id, c_clicked) 
VALUES
   (
      {uuid}, {id} 
   )
Example
UPDATE
   app_fd_sample 
SET
   c_clicked = CONCAT(c_clicked, ',', {id}) 
WHERE
   id = {id}
Example
DELETE
FROM
   app_fd_myTable 
WHERE
   id = {id}

Table & Column Naming

  • For database tables created by Joget Forms, Joget adds a "c_" in front of table column names (or "t_" if your column name starts with a number) and "app_fd_" in front of database table names.
  • If you use environment hash variables to store SQL query strings, in your hash variable, use "?noescape" to escape SQL query strings in JDBC binders to prevent the "<>" "not equal" operator from being converted, i.e. disables XSS prevention checking. Read here for more information..

How it works?

The special parameters {id} and {uuid} will be replaced with actual values through the use of PreparedStatement. As you can see from the example above, there is no need to encapsulate both of these special keywords with quotes.

Related Database SQL Binders & Useful Links

Download Demo App

APP_datalist_using_jdbc_dx_kb.jwa

 

 

 



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