Oracle动态执行SQL四种方式的例子
方式1
CREATE OR REPLACE PROCEDURE demo(salary IN NUMBER) AS
cursor_name INTEGER;
rows_processed INTEGER;
BEGIN
cursor_name := dbms_sql.open_cursor;
dbms_sql.parse(cursor_name, 'DELETE FROM emp WHERE sal > :x',
dbms_sql);
dbms_sql.bind_variable(cursor_name, ':x', salary);
rows_processed := dbms_sql.execute(cursor_name);
dbms_sql.close_cursor(cursor_name);
EXCEPTION
WHEN OTHERS THEN
dbms_sql.close_cursor(cursor_name);
END;
CREATE OR REPLACE PROCEDURE exec(STRING IN varchar2) AS
cursor_name INTEGER;
ret INTEGER;
BEGIN
cursor_name := DBMS_SQL.OPEN_CURSOR;
--DDL statements are executed by the parse call, which
--performs the implied commit
DBMS_SQL.PARSE(cursor_name, string, DBMS_SQL);
ret := DBMS_SQL.EXECUTE(cursor_name);
DBMS_SQL.CLOSE_CURSOR(cursor_name);
END;
execute immediate "drop table tab_temp";
方式2
CREATE OR REPLACE PROCEDURE copy(source IN VARCHAR2,
destination IN VARCHAR2) is
-- This procedure copies rows from a given source table to a
-- given destination table assuming that both source and
-- destination tables have the following columns:
-- - ID of type NUMBER,
-- - NAME of type VARCHAR2(30),
-- - BIRTHDATE of type DATE.
id NUMBER;
name VARCHAR2(30);
birthdate DATE;
source_cursor INTEGER;
destination_cursor INTEGER;
ignore INTEGER;
BEGIN
-- prepare a cursor to select from the source table
source_cursor := dbms_sql.open_cursor;
DBMS_SQL.PARSE(source_cursor,
'SELECT id, name, birthdate FROM ' || source,
DBMS_SQL);
DBMS_SQL.DEFINE_COLUMN(source_cursor, 1, id);
DBMS_SQL.DEFINE_COLUMN(source_cursor, 2, name, 30);
DBMS_SQL.DEFINE_COLUMN(source_cursor, 3, birthdate);
ignore := DBMS_SQL.EXECUTE(source_cursor);
-- prepare a cursor to insert into the destination table
destination_cursor := DBMS_SQL.OPEN_CURSOR;
DBMS_SQL.PARSE(destination_cursor,
'INSERT INTO ' || destination ||
' VALUES (:id, :name, :birthdate)',
DBMS_SQL);
-- fetch a row from the source table and
-- insert it into the destination table
LOOP
IF DBMS_SQL.FETCH_ROWS(source_cursor)>0 THEN
-- get column values of the row
DBMS_SQL.COLUMN_VALUE(source_cursor, 1, id);
DBMS_SQL.COLUMN_VALUE(source_cursor, 2, name);
DBMS_SQL.COLUMN_VALUE(source_cursor, 3, birthdate);
-- bind the row into the cursor that inserts into the
-- destination table
-- You could alter this example to require the use of
-- dynamic SQL by inserting an if condition before the
-- bind.
DBMS_SQL.BIND_VARIABLE(destination_cursor, 'id', id);
DBMS_SQL.BIND_VARIABLE(destination_cursor, 'name', name);
DBMS_SQL.BIND_VARIABLE(destination_cursor, 'birthdate',
birthdate);
ignore := DBMS_SQL.EXECUTE(destination_cursor);
ELSE
-- no more row to copy
EXIT;
END IF;
END LOOP;
-- commit and close all cursors
COMMIT;
DBMS_SQL.CLOSE_CURSOR(source_cursor);
DBMS_SQL.CLOSE_CURSOR(destination_cursor);
EXCEPTION
WHEN OTHERS THEN
IF DBMS_SQL.IS_OPEN(source_cursor) THEN
DBMS_SQL.CLOSE_CURSOR(source_cursor);
END IF;
IF DBMS_SQL.IS_OPEN(destination_cursor) THEN
DBMS_SQL.CLOSE_CURSOR(destination_cursor);
END IF;
RAISE;
END;
方式3
declare
stmt varchar2(200);
dept_no_array dbms_sql.Number_Table;
c number;
dummy number;
begin
dept_no_array(1) := 10; dept_no_array(2) := 20;
dept_no_array(3) := 30; dept_no_array(4) := 40;
dept_no_array(5) := 30; dept_no_array(6) := 40;
stmt := 'delete from emp where deptno = :dept_array';
c := dbms_sql.open_cursor;
dbms_sql.parse(c, stmt, dbms_sql.native);
dbms_sql.bind_array(c, ':dept_array', dept_no_array, 1, 4);
dummy := dbms_sql.execute(c);
dbms_sql.close_cursor(c);
exception when others then
if dbms_sql.is_open(c) then
dbms_sql.close_cursor(c);
end if;
raise;
end;
declare
stmt varchar2(200);
empno_array dbms_sql.Number_Table;
empname_array dbms_sql.Varchar2_Table;
c number;
dummy number;
begin
for i in 0..9 loop
empno_array(i) := 1000 + i;
empname_array(I) := get_name(i);
end loop;
stmt := 'insert into emp values(:num_array, :name_array)';
c := dbms_sql.open_cursor;
dbms_sql.parse(c, stmt, dbms_sql.native);
dbms_sql.bind_array(c, ':num_array', empno_array);
dbms_sql.bind_array(c, ':name_array', empname_array);
dummy := dbms_sql.execute(c);
dbms_sql.close_cursor(c);
exception when others then
if dbms_sql.is_open(c) then
dbms_sql.close_cursor(c);
end if;
raise;
end;
declare
stmt varchar2(200);
emp_no_array dbms_sql.Number_Table;
emp_addr_array dbms_sql.Varchar2_Table;
c number;
dummy number;
begin
for i in 0..9 loop
emp_no_array(i) := 1000 + i;
emp_addr_array(I) := get_new_addr(i);
end loop;
stmt := 'update emp set ename = :name_array
where empno = :num_array';
c := dbms_sql.open_cursor;
dbms_sql.parse(c, stmt, dbms_sql.native);
dbms_sql.bind_array(c, ':num_array', empno_array);
dbms_sql.bind_array(c, ':name_array', empname_array);
dummy := dbms_sql.execute(c);
dbms_sql.close_cursor(c);
exception when others then
if dbms_sql.is_open(c) then
dbms_sql.close_cursor(c);
end if;
raise;
end;
方式4
declare
c number;
d number;
n_tab dbms_sql.Number_Table;
indx number := -10;
begin
c := dbms_sql.open_cursor;
dbms_sql.parse(c, 'select n from t order by 1', dbms_sql);
dbms_sql.define_array(c, 1, n_tab, 10, indx);
d := dbms_sql.execute(c);
loop
d := dbms_sql.fetch_rows(c);
dbms_sql.column_value(c, 1, n_tab);
exit when d != 10;
end loop;
dbms_sql.close_cursor(c);
exception when others then
if dbms_sql.is_open(c) then
dbms_sql.close_cursor(c);
end if;
raise;
end;
declare
c number;
d number;
n_tab dbms_sql.Number_Table;
d_tab1 dbms_sql.Date_Table;
v_tab dbms_sql.Varchar2_Table;
d_tab2 dbms_sql.Date_Table;
indx number := 10;
begin
c := dbms_sql.open_cursor;
dbms_sql.parse(c, 'select * from multi_tab order by 1', dbms_sql);
dbms_sql.define_array(c, 1, n_tab, 5, indx);
dbms_sql.define_array(c, 2, d_tab1, 5, indx);
dbms_sql.define_array(c, 3, v_tab, 5, indx);
dbms_sql.define_array(c, 4, d_tab2, 5, indx);
d := dbms_sql.execute(c);
loop
d := dbms_sql.fetch_rows(c);
dbms_sql.column_value(c, 1, n_tab);
dbms_sql.column_value(c, 2, d_tab1);
dbms_sql.column_value(c, 3, v_tab);
dbms_sql.column_value(c, 4, d_tab2);
exit when d != 5;
end loop;
dbms_sql.close_cursor(c);
