Αποτελέσματα Αναζήτησης
3 Φεβ 2023 · I have verified that table 'df' does exist and that the select query runs fine within Oracle DB. You need to check that: The table df exists for the EM user, and not for User27 (otherwise the table will exist but for the wrong user).
30 Αυγ 2018 · To do this, I wrote a function with two parameters: the connection object and the statement text, and this returns the cursor that has been executed in the function: def executeStmt (conn, stmt): if conn is not None and isinstance (conn, cx_Oracle.Connection): cur = conn.cursor () cur.execute (stmt) return cur.
Review the code contained in type_output.py: import cx_Oracle import db_config con = cx_Oracle.connect (db_config.user, db_config.pw, db_config.dsn) cur = con.cursor () print ("Standard output...") for row in cur.execute ("select * from dept"): print (row) In a terminal window, run: python type_output.py.
in this tutorial, you will learn how to select data from Oracle Database using fetchone(), fetchmany(), and fetchall() methods.
Consider the following statement that uses the NOT EXISTS operator: SELECT * FROM table_name WHERE NOT EXISTS (subquery); Code language: SQL (Structured Query Language) ( sql ) The NOT EXISTS operator returns true if the subquery returns no row.
31 Ιαν 2023 · This is a quick guide to using the python-oracledb library to connect to an Oracle database and execute SQL statements in Python. With this basic understanding, you can start using the python-oracledb library to interact with your Oracle database in your Python applications.
In this section we will examine batching techniques for SELECT statements and also INSERT, UPDATE and DELETE statements. SELECT statements. For SELECT statements we can control the number of statements retrieved for each fetch using Cursor.arraysize. The following statement sets the array size to 4 and then queries the EMP table:
