I found a way to do it like this:
import sqlite3
conn = sqlite3.connect(
'avg_prices.db',
detect_types=sqlite3.PARSE_DECLTYPES | sqlite3.PARSE_COLNAMES)
cursorObj = conn.cursor()
cursorObj.execute('SELECT name from sqlite_master where type= "table"')
listed_tables =cursorObj.fetchall()
last_table = listed_tables[len(listed_tables)-1][0]
rate="VES/COP"
sql = "SELECT * FROM" + "'" + last_table + "'" + "WHERE Rates=" + "'" + rate + "'"
cursorObj.execute(sql)
result = cursorObj.fetchone()
Being result the values that I wanted to get.
I check this: MySQL - query for last created table
And it seems there is an easier way, but I didn't manage to get it to work on python.
SQLite does not store the creation time of tables. That means that you cannot do what you want.
The sqlite_master has no relevant column. You are at your own risk if you assume that the results are returned in table creation order.
Related
I am using vb.net and I need to query 4 SQL Tables and write the output to a DataTable.
So I am doing this (example with 2 Tables), and it works fine:
If CBbf.Checked = True Then
pgCommand.CommandText = "Select * FROM ""bf"" WHERE LOWER(""devname"") Like LOWER('" & TBname.Text & "%')"
sda = New NpgsqlDataAdapter(pgCommand)
sda.Fill(dtRecord)
End If
If CBhp.Checked = True Then
pgCommand.CommandText = "Select * FROM ""hp"" WHERE LOWER(""devname"") Like LOWER('" & TBname.Text & "%')"
sda = New NpgsqlDataAdapter(pgCommand)
sda.Fill(dtRecord)
End If
Now I would like to add a Column on each query, so that I know from which Query the output comes from.
e.g.:
So I would like to know how I can add the "from" column and fill the values according to the query I am doing.
Thank you!
Add a column to your select that includes the table name:
Select bf.*, 'bf' as table_name FROM ""bf"" bf WHERE LOWER(""devname"") Like LOWER('" & TBname.Text & "%')
Consider combining to a single query using UNION ALL.
I am using Eclipse and Oracle SQL Developer. My connections are all set up. I am trying to query my database in SQL Developer by passing in a column name as a variable.
For example, I just want to use something similar to this statement:
select * from CUSTOMERS;
but allow CUSTOMERS to be a variable where I can pass in any table name.
Currently this pulls all column names from given column name and connection:
final String query = "select column_name from all_tab_columns"
+" where owner = ?"
+" and table_name = ?";
try {
headers = DAO.useJNDI(jndi)
.setSQL(query)
.input(1, host)
.input(2, tableName)
.list(String.class);
I want to do the same thing but with rows. Does anyone know how to do this? This is what I am thinking about so far:
final String sql = "select *"
+ " from table_name"
+ " where owner = ? and table_name = ?";
try {
logger.debug(tableName+sourceJNDI);
sourceList = DAO.useJNDI(sourceJNDI)
.setSQL(sql)
.input(1, host)
.input(2, tableName)
.list(DatabaseCompareDto.class);
The main focus is the SQL statements. I know everything else works.
If I'm reading your question correctly, I think what you want is to replace the first table_name in your SQL with ?, then add an additional .input( 1, tableName) :
final String sql = "select *"
+ " from ?"
+ " where owner = ? and table_name = ?";
try {
logger.debug(tableName+sourceJNDI);
sourceList = DAO.useJNDI(sourceJNDI)
.setSQL(sql)
.input(1, tableName)
.input(2, host)
.input(3, tableName)
.list(DatabaseCompareDto.class);
You can't pass the table name as a parameter. Instead of wasting your energy on such an alleged generic solution, use or create a small templating engine which allows you to replace the table name in your query before sending it to the database.
I am trying to do a kind of insert into select statement. I want to insert one column as standard and the second through a select. However this is not working:
queryString = "INSERT INTO Words (Word, SortedId) VALUES ('" + words[i] + "', (SELECT TOP 1 SortedId FROM SortedWords WHERE SortedWord = '" + sortWord(words[i]) + "'))";
SortedWords is already filled with data. But at the moment i get this error
{"There was an error parsing the query. [ Token line number = 1,Token line offset = 50,Token in error = SELECT ]"}
Note:
not sure if i need the TOP 1 bit or not, get error either way. But I obvs only want to insert one row.
Change your query to
queryString = "INSERT INTO Words (Word, SortedId) SELECT '" + words[i] + "', (SELECT TOP 1 SortedId FROM SortedWords WHERE SortedWord = '" + sortWord(words[i]) + "')";
Also, instead of concatenating strings to get your query, use parameters to avoid SQL injection.
Try next and better practice to use a SqlParameters:
INSERT INTO words
(word,
sortedid)
(SELECT TOP 1 #Word,
sortedid
FROM sortedwords
WHERE sortedword = #SortedWord)
And before execiting query create a parameters(C#)
//Assume you have a SqlCommand object(lets name it command)
command.Parameters.AddWithValue("#Word", words[i]);
command.Parameters.AddWithValue("#SortedWord", sortWord(words[i]));
So I fetched some data from a mdb file in c# via
"SELECT * FROM " + listBox1.GetItemText(listBox1.SelectedItem) + " WHERE Note = '" + listBox2.GetItemText(listBox2.SelectedItem).Replace("'","\'") + "'";
which selects the right data, here it is
SELECT * FROM Main WHERE Note ='Hello'
The mdb data structure looks like this being plotted as a CSV-file:
"Record ID";Status;Placement;Private;Category;Note;Blob
14341665;4;2147483647;True;3;"""Hello"" - Neues
But when I try to remove entries with
"DELETE FROM " + listBox1.GetItemText(listBox1.SelectedItem) + " WHERE \"Record ID\" LIKE '" + dr[0] + "';";
or
"DELETE FROM " + listBox1.GetItemText(listBox1.SelectedItem) + " WHERE \"Record ID\" = '" + dr[0] + "';";
which looks like for instance
DELETE FROM Main WHERE "Record ID" LIKE '14341665';
The entries just stay there. I can rerun the select command even restart my application, the mdb is not changed.
Is record ID a numeric field? If so, lose the quotes.
DELETE FROM Main WHERE [Record ID] = 14341665;
Note that spaces in field (column) names will always be a problem. Such columns names have to be enclosed in square brackets, as do columns named with reserved words.
The record id is numeric, so don't put apostrophes around it:
"DELETE FROM " + listBox1.GetItemText(listBox1.SelectedItem) + " WHERE \"Record ID\" = " + dr[0]
Note: You should avoid using select * in production code, you should specify the data that you want returned. Also, you should use parameterised queries instead of concatenating values into the query.
if i remember correctly, "like" only works on string data, please check the data type of Record ID.
If Record ID is numeric, you may want to use database's conversion function to convert it into string before filtering using "like".
btw, remember to make sure that dr[0] is properly escaped.
I have the following table in a SQLite3 database:
CREATE TABLE overlap_results (
neighbors_of_annotation varchar(20),
other_annotation varchar(20),
set1_size INTEGER,
set2_size INTEGER,
jaccard REAL,
p_value REAL,
bh_corrected_p_value REAL,
PRIMARY KEY (neighbors_of_annotation, other_annotation)
);
I would like to perform the following query:
SELECT * FROM overlap_results WHERE
(neighbors_of_annotation, other_annotation)
IN (('16070', '8150'), ('16070', '44697'));
That is, I have a couple of tuples of annotation IDs, and I'd like to fetch
records for each of those tuples. The sqlite3 prompt gives me the following
error:
SQL error: near ",": syntax error
How do I properly express this as a SQL statement?
EDIT I realize I did not explain well what I am really after. Let me try another crack at this.
If a person gives me an arbitrary list of terms in neighbors_of_annotation that they're interested in, I can write a SQL statement like the following:
SELECT * FROM overlap_results WHERE
neighbors_of_annotation
IN (TERM_1, TERM_2, ..., TERM_N);
But now suppose that person wants to give me pairs of terms if the form (TERM_1,1, TERM_1,2), (TERM_2,1, TERM_2,2), ..., (TERM_N,1, TERM_N,2), where TERM_i,1 is in neighbors_of_annotation and TERM_i,2 is in other_annotation. Does the SQL language provide an equally elegant way to formulate the query for pairs (tuples) of interest?
The simplest solution seems to be to create a new table, just for these pairs,
and then join that table with the table to be queried, and select only the
rows where the first terms and the second terms match. Creating tons of AND /
OR statements looks scary and error prone.
I've never seen SQL like that. If it exists, I would suspect it's a non-standard extension. Try:
SELECT * FROM overlap_results
WHERE neighbors_of_annotation = '16070'
AND other_annotation = '8150'
UNION ALL SELECT * FROM overlap_results
WHERE neighbors_of_annotation = '16070'
AND other_annotation = '44697';
In other words, build the dynamic query from your tuples but as a series of unions instead, or as a series of ANDs within ORs:
SELECT * FROM overlap_results
WHERE (neighbors_of_annotation = '16070' AND other_annotation = '8150')
OR (neighbors_of_annotation = '16070' AND other_annotation = '44697');
So, instead of code (pseudo-code, tested only in my head so debugging is your responsibility) such as:
query = "SELECT * FROM overlap_results"
query += " WHERE (neighbors_of_annotation, other_annotation) IN ("
sep = ""
for element in list:
query += sep + "('" + element.noa + "','" + element.oa + "')"
sep = ","
query += ");"
you would instead have something like:
query = "SELECT * FROM overlap_results "
sep = "WHERE "
for element in list:
query += sep + "(neighbors_of_annotation = '" + element.noa + "'"
query += " AND other_annotation = '" + element.oa + "')"
sep = "OR "
query += ";"
I'm not aware of any SQL dialects that support tuples inside IN clauses. I think you're stuck with:
SELECT * FROM overlap_results WHERE (neighbors_of_annotation = '16070' and other_annotation = '8150') or (neighbors_of_annotation = '16070' and other_annotation = '44697')
Of course, this particular query can be simplified to something like:
SELECT * FROM overlap_results WHERE neighbors_of_annotation = '16070' and (other_annotation = '8150' or other_annotation = '44697')
Generally SQL WHERE-clause predicates only allow filtering on a single-column.