I have a table with columns machine id like (311a__) and (311bb__) and some of them like (08576). How can I retrieve them in SQL - how to insert into row where machine ID is like ( 311a__)? My question how to insert and select a column which has spaces in it.. How to retrieve data where machine_name ="%s__" is it correct
sql_local = """SELECT id FROM customer_1.pay_machines WHERE machine_name="%s" """ % machine
retVal = cursor.execute(sql_local)
if (retVal == 0):
sql_local = """INSERT INTO customer_1.pay_machines (machine_name, carpark_id) VALUES ("%s", 0)""" % machine
Surround odd (or reserved word) column names with backticks:
SELECT *
FROM pd
WHERE `machine id` = '(%s__)';
edit: removed invalid insert query as the first query is sufficient as an example
Related
I'm building a desktop app with PyQt5 to connect with, load data from, insert data into and update a MySQL database. What I came up with to update the database and insert data into the database works. But I feel there should be a much faster way to do it in terms of computation speed. If anyone could help that would be really helpful. What I have as of now for updating the database is this -
def log_change(self, item):
self.changed_items.append([item.row(),item.column()])
# I connect this function to the item changed signal to log any cells which have been changed
def update_db(self):
# Creating an empty list to remove the duplicated cells from the initial list
self.changed_items_load= []
[self.changed_items_load.append(x) for x in self.changed_items if x not in self.changed_items_load]
# loop through the changed_items list and remove cells with no values in them
for db_wa in self.changed_items_load:
if self.tableWidget.item(db_wa[0],db_wa[1]).text() == "":
self.changed_items_load.remove(db_wa)
try:
mycursor = mydb.cursor()
# loop through the list and update the database cell by cell
for ecr in self.changed_items_load:
command = ("update table1 set `{col_name}` = %s where id=%s;")
# table widget column name matches db table column name
data = (str(self.tableWidget.item(ecr[0],ecr[1]).text()),int(self.tableWidget.item(ecr[0],0).text()))
mycursor.execute(command.format(col_name = self.col_names[ecr[1]]),data)
# self.col_names is a list of the tableWidget columns
mydb.commit()
mycursor.close()
except OperationalError:
Msgbox = QMessageBox()
Msgbox.setText("Error! Connection to database lost!")
Msgbox.exec()
except NameError:
Msgbox = QMessageBox()
Msgbox.setText("Error! Connect to database!")
Msgbox.exec()
For inserting data and new rows into the db I was able to find some info online about that. But I have been unable to insert multiple lines at once as well as insert varying column length for each row. Like if I want to insert only 2 columns at row 1, and then 3 columns at row 2... something like that.
def insert_db(self):
# creating a list of each column
self.a = [self.tableWidget.item(row,1).text() for row in range (self.tableWidget.rowCount()) if self.tableWidget.item(row,1) != None]
self.b = [self.tableWidget.item(row,2).text() for row in range (self.tableWidget.rowCount()) if self.tableWidget.item(row,2) != None]
self.c = [self.tableWidget.item(row,3).text() for row in range (self.tableWidget.rowCount()) if self.tableWidget.item(row,3) != None]
self.d = [self.tableWidget.item(row,4).text() for row in range (self.tableWidget.rowCount()) if self.tableWidget.item(row,4) != None]
try:
mycursor = mydb.cursor()
mycursor.execute("INSERT INTO table1(Name, Date, Quantity, Comments) VALUES ('%s', '%s', '%s', '%s')" %(''.join(self.a),
''.join(self.b),
''.join(self.c),
''.join(self.d)))
mydb.commit()
mycursor.close()
except OperationalError:
Msgbox = QMessageBox()
Msgbox.setText("Error! Connection to database lost!")
Msgbox.exec()
except NameError:
Msgbox = QMessageBox()
Msgbox.setText("Error! Connect to database!")
Msgbox.exec()
Help would be appreciated. Thanks.
Like if I want to insert only 2 columns at row 1, and then 3 columns at row 2
No. A given Database table has a specific number of columns. That is an integral part of the definition of a "table".
INSERT adds new rows to a table. It is possible to construct a single SQL statement that inserts multiple rows "all at once".
UPDATE modifies one or more rows of a table. The rows are indicated by some condition specified in the Update statement.
Constructing SQL with %s is risky -- it gets in trouble if there are quotes in the string being inserted.
(I hope these comments help you get to the next stage of understanding databases.)
I am using python sql to edit a very simple table named students (whose columns are name and age), as shown below:
('Rachel', 22)
('Linckle', 33)
('Bob', 45)
('Amanda', 25)
('Jacob', 85)
('Avi', 65)
('Michelle', 45)
I am defining python functions to execute SQL code.
In my first function I want to update the age values in students table where the name matches something (e.g. Bob). If I define the following function:
def update_age(age, name):
c.execute("""UPDATE students SET age = %s
WHERE name = %s""", (age, name))
And then:
update_age(99, 'Bob')
I will get:
('Rachel', 22)
('Linckle', 33)
('Bob', 99)
('Amanda', 25)
('Jacob', 85)
('Avi', 65)
('Michelle', 45)
On a second function I would like to specify also the name of the table, with the following code:
def update_age_table(table, age, name):
c.execute("""UPDATE %s SET age = %s
WHERE name = %s""",
(table, age, name)) # note that here I am only replacing students by the placeholder %s
Then if I do:
update_age_table(table='students', age=95, name='Jacob')
I will get the following error message (it is long, I am only displaying the last sentence:
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''students' SET age = 95
WHERE name = 'Jacob'' at line 1
I guess that the error comes from the fact that I am assigning two of the placeholders to variables, namely age and name, which is not the case of the table name, where there is no variable assignment.
Does anyone know how I can use placeholders in SQL commands without assigning them to variables?
Thatś because you cannot pass the table name as a parameter in the execute sentence. You should do it this way:
def update_age_table(table, age, name):
c.execute("UPDATE "+table+" SET age = %s
WHERE name = %s",
(table, age, name)) #
The prepared statement doesn't work for table names
EDIT
You have to remove the table parameter like this:
def update_age_table(table, age, name):
c.execute("UPDATE "+table+" SET age = %s WHERE name = %s",(age, name)) #
Sorry was a mistake
dt= datetime.datetime.now()
new_date=str(dt)
idname=input("Please enter Your Id. ")
bname= input("Please Enter name of book which you want to Issue: ")
idn=(idname,)
sql="insert into id%s (issuedbook,date)"%idn +"values (%s,%s)"
val=(bname,new_date)
cursor.execute(sql,val)
cnx.commit()
insert_data()```
Without having tested it, this should be a better coding style of the accepted answer. As the whole Q/A shows, the variables are passed only at cursor.execution() time to make it more secure, but the table statement of the execute() string is evaluated before the args are evaluated, that is why tables have to be plain text evaluated before execute() but the variables do not. See another example with similar challenge at Python - pass a list as params to SQL, plus more variables where the table is not passed either.
Therefore, just as an add-on for the rightly accepted query:
def update_age_table(UPDATE_QUERY, args):
c.execute(UPDATE_QUERY, args)
c.commit()
# example for string testing:
table, age, name = "table_x", 2, "name_y"
UPDATE_QUERY = f"""
UPDATE {table}
SET age = %s
WHERE name = %s
"""
# # UPDATE_QUERY Out:
# '\n UPDATE table_x\n SET age = %s\n WHERE name = %s\n'
args = [age, name]
update_age_table(UPDATE_QUERY, args)
Previously, this was working:
$patient_story_set_photos = $wpdb->get_results('SELECT * FROM wp_before_after WHERE patientID = '.$post->ID.' AND patient_display = 1');
However, when I try to add another AND condition like this:
$patient_story_set_photos = $wpdb->get_results('SELECT * FROM wp_before_after WHERE patientID = '.$post->ID.' AND patient_display = 1 AND period_taken = '.$set->period_taken);
I get the following error on screen:
WordPress database error: [Unknown column '1hour' in 'where clause']
SELECT * FROM wp_before_after WHERE patientID = 8175 AND patient_display = 1 AND period_taken = 1hour
Can't see why there's a problem, are you not allowed to use multiple AND conditions in SQL?
The problem is not the AND, the problem is your 1hour, 1hour unquoted means a reference to an object (database, table) named 1hour, you need to quote '1hour'.
If you write
SELECT * FROM wp_before_after
WHERE patientID = 8175
AND patient_display = 1
AND period_taken = '1hour'
you will compare the field periodtaken to a string (CHAR,VARCHAR,TEXT) equal to '1hour'.
I assume period_taken is a field typed CHAR,VARCHAR or TEXT
Before anything, DO NOT CONCATENATE SQL STRINGS nowadays it is a MUST (see how to do it properly https://stackoverflow.com/a/60496/3771219)
The problem you are facing is because, I presume, that the period_taken field is some sort of Char/Varchar/String field and when you are filtering by a "Stringy" field you must sorround your literals values with single quotes:
SELECT *
FROM wp_before_after
WHERE patientID = 8175
AND patient_display = 1
AND period_taken = '1hour'
Hope this help
I'm working now on some dictionary and i'm downloading source from multiple dictionaries into mysql database.
I have two tables:
Words
ID and Word
ie. VALUES:
123, "Hakunamatata"
332, "Boom"
Source
ID, WordID and Numerical ie. VALUES:
1, 123, 7676552
2, 332, 651365
Now, i would like to update data in Source this way:
find ID in Words WHERE Word = "example"
put datum (WordID, "Number") into Source
BUT
If there is no such Word in Words - create it.
I need to do about 100000 of queries of this type, but it does not need to be very fast ;)
I've tried to do something like this:
REPLACE INTOsjp-dict.Words
LEFT JOINsjp-dict.Source-Wiktionary
ONWords.ID =Source-Wiktionary.WordID
SET
Word= IF(WordIS NULL, "Apulia",Word),
WordID= IF(Source-Wiktionary.WordID IS NULL ANDWord= "Apulia",Words.ID,WordID),
WikiWordID= IF(Word= "Apulia", 123, WikiWordID)
But it does not work...
Done with two sql commands:
$sql = 'INSERT IGNORE INTO Words (Word) VALUES '. $sql_words;
$sql2 = 'INSERT IGNORE INTO "Source-Wiktionary" (WordID, WikiWordID) VALUES '. $sql_values;
Where WordID is definied by
SELECT ID FROM Words WHERE Word = "'. strtolower($cma[2]). '" LIMIT 1
I have the following sql that I run in C:
snprintf(sql, 200, "update rec set name = (select name from pers where id = %d )
where id = %d",rec_id , emp_id );
mysql_query(conn, sql) returns a successful result but it's putting 1 in the "rec" table in the "name" field instead of the name, but when I printf the output and use it in MySQL it's working fine.
update rec set name = (select name from pers where id = 104 ) where id = 43
Is there something wrong with my sprintf? Or something has to be added?
I also tried static sql command like this
snprintf(sql,"update rec set name = (select name from pers where id = 104 ) where id = 43");
and it also put 1 in the rec.name
Is that due to count of record returned by the sub query? Can you verify by putting a condition which returns e.g. 2 records so that the name is set to 2? if this is the reason then (though less performing approach) try splitting the queries and see if it works this time.