A good way of running a SQL query in JDBC using a parameterized statement 1

A good way of running a SQL query in JDBC using a parameterized statement

// Connect to the database.
Connection conn = DriverManager.getConnection(URL, USER, PASS);

// Construct the SQL statement we want to run, specifying the parameter.
String sql = "SELECT * FROM users WHERE email = ?";

// Generate a prepared statement with the placeholder parameter.
PreparedStatement stmt = conn.prepareStatement(sql);

// Bind email value into the statement at parameter index 1.
stmt.setString(1, email);

// Run the query...
ResultSet results = stmt.executeQuery(sql);

while (results.next())
{
    // ...do something with the data returned.
}

Here is what the above code is Doing:
1. We create a connection to the database.
2. We create a prepared statement with a placeholder parameter.
3. We bind the value of the email variable into the statement at parameter index 1.
4. We run the query.

The prepared statement is a template for the SQL statement we want to run. The placeholder parameter is a question mark (?). When we bind the value of the email variable into the statement, we’re replacing the question mark with the value of the email variable.

The prepared statement is a template for the SQL statement we want to run. The placeholder parameter is a question mark (?). When we bind the value of the email variable into the statement, we’re replacing the question mark with the value of the email variable.

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