Horny chatroo - Cursor for updating table in sql oracle

This sample demonstrates date formatting, delimiters within delimiters and implementation of record numbering with a SQL*Loader sequence.

APPEND indicates that the table need not be empty before the SQL*Loader is run.

c1 author_cursor; Now c1 is a variable of a cursor type. open c1 for select * from authors; Now c1 has all the attributes of the actual cursor.

cursor for updating table in sql oracle-75

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REF Cursors A REF CURSOR or cursor variable is just a reference or a handle to a static cursor.

For a database, I have been asked to add few columns and update them with new values from another table. To accomplish this, we researched 3 solutions: update via insert, merge statement and pl/sql with bulk collect. LAST SAVE EXCEPTIONS update (select col1, col2 from base_table ) set row = update_cols_tab(i) where rowid = row_id_tab(i); commit; exit when base_tab.count < 5000; end loop; commit; close base_table_cur; close new_data_cur; EXCEPTION WHEN dml_errors THEN FOR i IN 1 ..

With this method, you don’t execute any updates, instead you create a new table with the old and new data. LAST LOOP row_id_tab(i) := new_data_tab(i).row_id; update_cols_tab(i).col1 := new_data_tab(i).new_col1; update_cols_tab(i).col2 := new_data_tab(i).new_col2; end loop; FORALL i IN base_tab.

If a strongly typed cursor returns something other that its return type, a "ROWTYPE_MISMATCH" exception is raised.

A strongly typed cursor type is less flexible but less prone to programming errors.

Before assigning a cursor variable, a cursor type must be defined.

type author_cursor is ref cursor; This "REF CURSOR" is a weak typed cursor variable because it does not define the datatype the cursor will return. type author_cursor is ref cursor returning author%rowtype; By strongly typing the cursor variable, you define what the cursor can return.

SQL declare 2 type auth_cursor is ref cursor; 3 c1 auth_cursor; 4 r_c1 c1%rowtype; 5 begin 6 null; 7 end; 8 / r_c1 c1%rowtype; * ERROR at line 4: ORA-06550: line 4, column 8: PLS-00320: the declaration of the type of this expression is incomplete or malformed ORA-06550: line 4, column 8: PL/SQL: Item ignored However, a strongly typed cursor can use the cursor variable to define the cursor record.

SQL declare 2 type auth_cursor is ref cursor return author%rowtype; 3 c1 auth_cursor; 4 r_c1 c1%rowtype; 5 begin 6 null; 7 end; 8 / In this example, the auth_cursor type returns an author%rowtype.

The ref cursor can be assigned to other ref cursor variables.

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