What are prepared statements and how do they work in different programming languages?

What are prepared statements and why are they important?

Prepared statements are precompiled SQL statements that help prevent SQL injection and improve performance.

Can you show me how to use prepared statements in Python?

Sure! In Python, you can use the sqlite3 module. Here's an example:

import sqlite3

conn = sqlite3.connect('example.db')
cursor = conn.cursor()

# Prepare a statement
stmt = "INSERT INTO users (name, age) VALUES (?, ?)"

# Execute the statement with parameters
cursor.execute(stmt, ('Alice', 30))
conn.commit()

How about in Java?

In Java, you can use PreparedStatement from the java.sql package. Here's an example:

import java.sql.*;

Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "user", "password");
PreparedStatement pstmt = conn.prepareStatement("INSERT INTO users (name, age) VALUES (?, ?)");
pstmt.setString(1, "Bob");
pstmt.setInt(2, 25);
pstmt.executeUpdate();