To write the text entered by the user to a database rather than a file, you will need to modify the save_text() function to use a database library such as SQLite, MySQL, or PostgreSQL. Here is an example using SQLite:
import sqlite3
import tkinter as tk

# create the database connection
conn = sqlite3.connect('saved_text.db')
c = conn.cursor()

# create a table to store the saved text (if it doesn't already exist)
c.execute('CREATE TABLE IF NOT EXISTS saved_text (text TEXT)')

# define the save_text function
def save_text():
    text = input_box.get()
    c.execute('INSERT INTO saved_text VALUES (?)', (text,))
    conn.commit()
    print("Text saved to database")

# create the window
root = tk.Tk()
root.title("Save Text")

# create the label and input box
label = tk.Label(root, text="Enter some text:")
label.pack()
input_box = tk.Entry(root)
input_box.pack()

# create the save button with the save_text function bound to it
save_button = tk.Button(root, text="Save", command=save_text)
save_button.pack()

# run the window
root.mainloop()

# close the database connection when the window is closed
conn.close()

In the above code, we connect to an SQLite database and create a table called saved_text with a single column called text. Then we modify the save_text() function to insert the entered text into the database using an SQL command. Finally, we commit the changes and print a success message to the console.

Keep in mind that you will have to install the necessary database library and configure your connection information (e.g., database filename, database credentials) to use this example code.
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