Django：如何在从mysql DB提取数据时使用LIKE

Question

I need a way to fetch similar records from DB using LIKE from Django . My code is :

def fetchProductsDate1(request):
    query = request.session.get('query')
    date1 = request.session.get('date1')
    db = pymysql.connect(host=host,user=user,passwd=passwd,db=dbName)
    # Create a Cursor object to execute queries.
    cur = db.cursor()
    # Select data from table using SQL query.
    stmt = "SELECT FSN FROM tab WHERE query LIKE '%s' AND DATE(updated_at) LIKE '%s' " % (query.replace("'", r"\'"), date1)
    log.info(stmt)
    cur.execute(stmt)
    rows = cur.fetchall()
    json_data = rows[0][0]

The db statement looks like:

SELECT num FROM tab WHERE query LIKE 'soch sarees' AND DATE(updated_at) LIKE '2018-11-14'

I want the statement to be like :

SELECT num FROM tab WHERE query LIKE '%soch sarees%' AND DATE(updated_at) LIKE '2018-11-14'

Any help will be really nice :)

Thanks.

Answer 1

You can use %% to do that

stmt = "SELECT FSN FROM tab WHERE query LIKE '%%%s%%' AND DATE(updated_at) LIKE '%s' " % (query.replace("'", r"\'"), date1)

Which will give us

SELECT FSN FROM tab WHERE query LIKE '%soch sarees%' AND DATE(updated_at) LIKE '2018-11-14'

Also, I think it' a bad practice to concat parameters like this.This opens path to SQL Injection

You could try:

select_stmt = "SELECT FSN FROM tab WHERE query LIKE '%%%(name)%%%' AND DATE(updated_at) LIKE '%(date)%'"
cursor.execute(select_stmt, { 'name': 'soch sarees','date':'2018-11-14' })