Oracle PL/SQL Tutorial/PL SQL Statements/Dynamic SQL statement
Содержание
An example of code using native dynamic SQL
<source lang="sql">
SQL> DECLARE
2 tableName VARCHAR2(30):="temp"; 3 sqlString VARCHAR2(150); 4 BEGIN 5 sqlString :="create table "||tableName||"(col1 NUMBER NOT NULL)"; 6 EXECUTE IMMEDIATE sqlString; 7 END; 8 /
PL/SQL procedure successfully completed. SQL> SQL> SQL> drop table temp; Table dropped.</source>
Create dynamic table
<source lang="sql">
SQL> Create or replace Procedure create_dyn_table2
2 (i_region_name VARCHAR2, 3 returnCode OUT NUMBER, 4 errorMessage OUT VARCHAR2) 5 authid current_user 6 Is 7 sqlString VARCHAR2(1000); 8 tableName VARCHAR2(30); 9 Begin 10 tableName :="ORDER_ITEMS_FOR_"||replace(trim(i_region_name),"","_"); 11 sqlString :="CREATE TABLE "||tableName|| 12 "(order_id NUMBER(10)NOT NULL, 13 item_id VARCHAR2(10)NOT NULL, 14 unit_price NUMBER(11,2)NOT NULL, 15 quantity NUMBER)"; 16 17 EXECUTE IMMEDIATE sqlString ; 18 19 returnCode :=0; 20 21 EXCEPTION WHEN OTHERS THEN 22 23 returnCode :=SQLCODE; 24 25 errorMessage :="ERR:Creating/Altering table "||tableName ||"-"||SQLERRM; 26 End; 27 /
Procedure created. SQL> SQL> SQL></source>
Dynamic DDL
<source lang="sql">
SQL> Create or replace Procedure create_dyn_table
2 (i_region_name VARCHAR2, 3 returnCode OUT NUMBER, 4 errorMessage OUT VARCHAR2) 5 authid current_user 6 Is 7 sqlString VARCHAR2(1000); 8 tableName VARCHAR2(30); 9 Begin 10 tableName :="ORDERS_FOR_"||replace(trim(i_region_name),"","_"); 11 sqlString :="CREATE TABLE "||tableName|| 12 "(order_id NUMBER(10)PRIMARY KEY, 13 sale_date DATE NOT NULL, 14 total_number NUMBER, 15 total_price NUMBER(15,2), 16 company_id NUMBER(6))"; 17 EXECUTE IMMEDIATE sqlString ; 18 returnCode :=0; 19 EXCEPTION WHEN OTHERS THEN 20 returnCode :=SQLCODE; 21 errorMessage :="ERR:Creating table "||tableName ||"-"||SQLERRM; 22 End; 23 /
Procedure created. SQL> SQL> SQL></source>
Dynamic DQL with DBMS_SQL package
<source lang="sql">
SQL> SQL> CREATE OR REPLACE PROCEDURE runddl (ddl_in in VARCHAR2)
2 IS 3 cur INTEGER:= DBMS_SQL.OPEN_CURSOR; 4 returnValue INTEGER; 5 BEGIN 6 DBMS_SQL.PARSE (cur, ddl_in, DBMS_SQL.NATIVE); 7 returnValue := DBMS_SQL.EXECUTE (cur); 8 DBMS_SQL.CLOSE_CURSOR (cur); 9 EXCEPTION 10 WHEN OTHERS 11 THEN 12 DBMS_OUTPUT.PUT_LINE ( 13 "RunDDL Failure on " || ddl_in); 14 DBMS_OUTPUT.PUT_LINE (SQLERRM); 15 DBMS_SQL.CLOSE_CURSOR (cur); 16 END; 17 /
Procedure created. SQL> SQL> SQL></source>
Dynamic PL/SQL
<source lang="sql">
SQL> SQL> SQL> CREATE TABLE customer_region(
2 region_id NUMBER(4) PRIMARY KEY, 3 region_name VARCHAR2(11) NOT NULL 4 );
Table created. SQL> SQL> SQL> INSERT INTO customer_region VALUES (1,"REGION1"); 1 row created. SQL> INSERT INTO customer_region VALUES (2,"REGION2"); 1 row created. SQL> INSERT INTO customer_region VALUES (3,"REGION3"); 1 row created. SQL> INSERT INTO customer_region VALUES (4,"REGION4"); 1 row created. SQL> SQL> SQL> Create or replace Procedure myProc(returnCode OUT NUMBER,errorMessage OUT VARCHAR2)
2 Is 3 CURSOR csr_region IS SELECT region_name FROM customer_region; 4 Dyn_proc_name VARCHAR2(100); 5 Dyn_plsql_string VARCHAR2(1000); 6 BEGIN 7 FOR idx IN csr_region LOOP 8 EXECUTE IMMEDIATE "BEGIN update_dyn_"||replace(trim(idx.region_name),"","_")||"(:1,:2);END;" 9 USING OUT returnCode,OUT errorMessage; 10 IF returnCode <>0 THEN 11 EXIT; 12 END IF; 13 END LOOP; 14 EXCEPTION WHEN OTHERS THEN 15 returnCode := SQLCODE; 16 errorMessage := SQLERRM; 17 END; 18 /
Procedure created. SQL> SQL> drop table customer_region; Table dropped. SQL> SQL> SQL></source>
Table row counter
<source lang="sql">
SQL> SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
2 ENAME VARCHAR2(10), 3 JOB VARCHAR2(9), 4 MGR NUMBER(4), 5 HIREDATE DATE, 6 SAL NUMBER(7, 2), 7 COMM NUMBER(7, 2), 8 DEPTNO NUMBER(2));
Table created. SQL> SQL> INSERT INTO EMP VALUES (7369, "SMITH", "CLERK", 7902, TO_DATE("17-DEC-1980", "DD-MON-YYYY"), 800, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7499, "ALLEN", "SALESMAN", 7698, TO_DATE("20-FEB-1981", "DD-MON-YYYY"), 1600, 300, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7521, "WARD", "SALESMAN", 7698, TO_DATE("22-FEB-1981", "DD-MON-YYYY"), 1250, 500, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7566, "JONES", "MANAGER", 7839, TO_DATE("2-APR-1981", "DD-MON-YYYY"), 2975, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7654, "MARTIN", "SALESMAN", 7698,TO_DATE("28-SEP-1981", "DD-MON-YYYY"), 1250, 1400, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7698, "BLAKE", "MANAGER", 7839,TO_DATE("1-MAY-1981", "DD-MON-YYYY"), 2850, NULL, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7782, "CLARK", "MANAGER", 7839,TO_DATE("9-JUN-1981", "DD-MON-YYYY"), 2450, NULL, 10); 1 row created. SQL> INSERT INTO EMP VALUES (7788, "SCOTT", "ANALYST", 7566,TO_DATE("09-DEC-1982", "DD-MON-YYYY"), 3000, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7839, "KING", "PRESIDENT", NULL,TO_DATE("17-NOV-1981", "DD-MON-YYYY"), 5000, NULL, 10); 1 row created. SQL> INSERT INTO EMP VALUES (7844, "TURNER", "SALESMAN", 7698,TO_DATE("8-SEP-1981", "DD-MON-YYYY"), 1500, 0, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7876, "ADAMS", "CLERK", 7788,TO_DATE("12-JAN-1983", "DD-MON-YYYY"), 1100, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7900, "JAMES", "CLERK", 7698,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 950, NULL, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7902, "FORD", "ANALYST", 7566,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 3000, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7934, "MILLER", "CLERK", 7782,TO_DATE("23-JAN-1982", "DD-MON-YYYY"), 1300, NULL, 10); 1 row created. SQL> SQL> SQL> SQL> CREATE OR REPLACE FUNCTION tabcount (
2 nm IN VARCHAR2, 3 whr IN VARCHAR2 := NULL) 4 RETURN PLS_INTEGER 5 IS 6 retval PLS_INTEGER; 7 v_where VARCHAR2(2000) := whr; 8 BEGIN 9 IF UPPER (whr) NOT LIKE "WHERE %" 10 THEN 11 v_where := "WHERE " || v_where; 12 END IF; 13 14 EXECUTE IMMEDIATE 15 "SELECT COUNT(*) FROM " || nm || " " || v_where 16 INTO retval; 17 RETURN retval; 18 END; 19 /
Function created. SQL> SQL> select tabcount("emp", null) from dual; TABCOUNT("EMP",NULL)
14
SQL> SQL> drop table emp; Table dropped.</source>
