How Can I Efficiently Access Single Query Results in Python's SQLite3?

Efficient access method for single query results in Python SQLite3

When using Python to operate a SQLite database, executing a SELECT query usually involves nested iterators to obtain results. Please see the following code example:

<code class="language-python">conn = sqlite3.connect('db_path.db')
cursor = conn.cursor()
cursor.execute("SELECT MAX(value) FROM table")

for row in cursor:
    for elem in row:
        maxVal = elem</code>

This code requires going through multiple nested loops to extract the required value. To simplify this process, you can use the following method:

Use Cursor.fetchone()

Cursor.fetchone() method conveniently retrieves the first row of the query results as a tuple. For the above scenario, the required value can be accessed directly as follows:

<code class="language-python">maxVal = cursor.fetchone()[0]</code>

This concise syntax can efficiently extract the maximum value without nested loops.

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