Class ParameterSql

This interface defines the properties necessary to execute a parameter SQL query. It encapsulates the parameters and their values, enabling secure and efficient database operations.

Inheritance

System.Object

ParameterSql

Namespace: Syncfusion.Blazor.QueryBuilder

Assembly: Syncfusion.Blazor.dll

Syntax

public class ParameterSql : Object

Remarks

Implementations of this interface should ensure that parameterized queries are constructed correctly to prevent SQL injection attacks. Parameterized SQL queries allow for the separation of SQL code from user input, thereby reducing the risk of malicious SQL injection attacks. For example, consider the following parameterized SQL query in C#:

using System.Data.SqlClient;

Define the SQL query with parameters
string queryString = "SELECT * FROM Users WHERE Username = ? AND Password = ?"; ///
Establish connection and command objects
using (SqlConnection connection = new SqlConnection(connectionString))
{  
SqlCommand command = new SqlCommand(queryString, connection);

Set parameter values
command.Parameters.AddWithValue("param1", username);
command.Parameters.AddWithValue("param2", password);

Execute the query
connection.Open();
SqlDataReader reader = command.ExecuteReader(); /// while (reader.Read())
{
Process results
}
}

In the above example, ‘?’ is the placeholders for the actual values of the username and password provided by the user. These placeholders are replaced with the user-supplied values at runtime. This approach mitigates the risk of SQL injection attacks since the user input is treated as data rather than executable SQL code.

Constructors

ParameterSql()

Declaration

public ParameterSql()

Properties

Params

Defines the parameter values in the same order as their respective placeholders appear in the SQL string.

Declaration

public object[] Params { get; set; }

Property Value

Type
System.Object[]

Remarks

This approach ensures that the parameters are correctly mapped to their corresponding placeholders in the SQL string, enabling accurate execution of parameterized queries. Note: This comment is specific to using question mark (?) placeholders for parameters in the SQL string.

Sql

Defines the SQL WHERE clause with bind variable placeholders for each value.

Declaration

public string Sql { get; set; }

Property Value

Type
System.String

Remarks

Using “?” placeholders help in separating SQL logic from data, enhancing security by preventing SQL injection attacks.

string sql = “SELECT * FROM Users WHERE Username = ? AND Password = ?”;