Return variable from cx_Oracle PL/SQL call in Python

Question

I want to execute an Oracle PL/SQL statement via cx_oracle in Python. Code looks like this:

db = cx_Oracle.connect(user, pass, dsn_tns)
cursor = db.cursor()
         


        

Answer 1

Agree with M. Wymann, and i had need of returning a string by passing number of elements in list. here is my code.

cursor = con.cursor()    
    for a,b,c in data:
    statement='''DECLARE
     t_name     VARCHAR2 (50);
     owner      VARCHAR2 (50);
     c_name     VARCHAR2 (50);
     O_type     VARCHAR2 (50);
     nullable   VARCHAR2 (20);
BEGIN
   SELECT t1.table_name,
          t1.owner,
          t1.column_name,
          CASE
             WHEN t1.data_type = 'NUMBER' AND t1.data_precision IS NULL
             THEN
                'NUMBER'
             WHEN t1.data_type = 'DATE'
             THEN
                t1.data_type
             WHEN REGEXP_REPLACE (t1.data_type, '(\d)|VAR', '') = 'CHAR'
             THEN
                t1.data_type || '(' || t1.DATA_LENGTH || ')'
             WHEN     t1.data_type = 'NUMBER'
                  AND t1.data_precision IS NOT NULL
                  AND t1.data_scale = 0
             THEN
                'NUMBER(' || t1.data_precision || ')'
             WHEN     t1.data_type = 'NUMBER'
                  AND t1.data_precision IS NOT NULL
                  AND t1.data_scale <> 0
             THEN
                'NUMBER(' || t1.data_precision || ',' || t1.data_scale || ')'
             ELSE
                'Not Handled'
          END
             "Oracle data type",
          t1.nullable
     INTO t_name,
          owner,
          c_name,
          O_type,
          nullable
     FROM all_tab_columns t1
    WHERE     t1.table_name = :tname
          AND t1.owner = :towner
          AND t1.column_name = :tcolname;

   :o_result :=
         t_name
      || '|'
      || owner
      || '|'
      || c_name
      || '|'
      || O_type
      || '|'
      || nullable;
EXCEPTION
   WHEN OTHERS
   THEN
      t_name := :tname;
      c_name := 'NOT FOUND ';
      owner := :towner;
      O_type := 'NOT FOUND ';
      nullable := 'NOT FOUND ';
      :o_result :=
            t_name
         || '|'
         || owner
         || '|'
         || c_name
         || '|'
         || O_type
         || '|'
         || nullable;
END;'''
    o_result = cursor.var(cx_Oracle.STRING)`enter code here`
    cursor.execute(statement, tname=a, towner=b, tcolname=c, o_result=o_result)
    ObLst = o_result.getvalue().split('|')