Oracle PL/SQL/Table/Transaction Rollback Commit
Содержание
- 1 alter rollback segment SEGMENT_NAME online
- 2 atomicity: roll back and commit
- 3 Rollback a delete
- 4 Rollback to savepoint in exception handler
- 5 SET TRANSACTION READ WRITE
- 6 set transaction use rollback segment SEGMENT_NAME
- 7 show autocommit
- 8 TRANSACTION CONTROL
- 9 Transaction Rollback and commit
- 10 Transactions and Error Handling
- 11 Transactions and Savepoints
alter rollback segment SEGMENT_NAME online
<source lang="sql">
SQL> alter rollback segment SEGMENT_NAME online; SQL> SQL> SQL> commit; SQL> SQL>
</source>
atomicity: roll back and commit
<source lang="sql">
SQL> SQL> SQL> create table t ( x number(1) ); Table created. SQL> / SQL> insert into t values ( 1 ); 1 row created. SQL> insert into t values ( 2 ); 1 row created. SQL> / 1 row created. SQL> rollback; Rollback complete. SQL> select * from t; no rows selected SQL> insert into t values ( 1 ); 1 row created. SQL> insert into t values ( 2 ); 1 row created. SQL> commit; Commit complete. SQL> select * from t;
X
1
2
SQL> /
X
1
2
SQL> SQL> drop table t; Table dropped.
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Rollback a delete
<source lang="sql">
SQL> SQL> -- create demo table SQL> create table Employee(
2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 /
Table created. SQL> SQL> -- prepare data SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values ("01","Jason", "Martin", to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto", "Programmer")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("02","Alison", "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("03","James", "Smith", to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("04","Celia", "Rice", to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("05","Robert", "Black", to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("06","Linda", "Green", to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York", "Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("07","David", "Larry", to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York", "Manager")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("08","James", "Cat", to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
3 /
1 row created. SQL> SQL> SQL> SQL> -- display data in the table SQL> select * from Employee
2 /
ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
---------- ---------- --------- --------- ---------- ---------- ---------------
01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected. SQL> SQL> delete from Employee where id = "01"; 1 row deleted. SQL> SQL> select id, last_name from Employee where id = "01"; no rows selected SQL> SQL> rollback; Rollback complete. SQL> SQL> SQL> -- clean the table SQL> drop table Employee
2 /
Table dropped. SQL> SQL> SQL>
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Rollback to savepoint in exception handler
<source lang="sql">
SQL> SQL> create table myTable2 ( cnt int ); Table created. SQL> SQL> insert into myTable2 values ( 0 ); 1 row created. SQL> SQL> create table t ( x int check ( x>0 ) ); Table created. SQL> SQL> create trigger t_trigger before insert or delete on t for each row
2 begin 3 if ( inserting ) then 4 update myTable2 set cnt = cnt +1; 5 else 6 update myTable2 set cnt = cnt -1; 7 end if; 8 dbms_output.put_line( "fired and updated " || sql%rowcount || " rows" ); 9 end; 10 /
Trigger created. SQL> SQL> create or replace procedure p
2 as 3 begin 4 insert into t values ( 1 ); 5 insert into t values (-1 ); 6 end; 7 /
Procedure created. SQL> select * from t; no rows selected SQL> select * from myTable2;
CNT
0
SQL> begin
2 p; 3 end; 4 /
fired and updated 1 rows fired and updated 1 rows begin
ERROR at line 1: ORA-02290: check constraint (sqle.SYS_C0010265) violated ORA-06512: at "sqle.P", line 5 ORA-06512: at line 2
SQL> select * from t; no rows selected SQL> select * from myTable2;
CNT
0
SQL> SQL> SQL> begin
2 p; 3 exception 4 when others then null; 5 end; 6 /
fired and updated 1 rows fired and updated 1 rows PL/SQL procedure successfully completed. SQL> select * from t;
X
1
SQL> select * from myTable2;
CNT
1
SQL> SQL> rollback; Rollback complete. SQL> SQL> begin
2 savepoint sp; 3 p; 4 exception 5 when others then 6 rollback to sp; 7 end; 8 /
fired and updated 1 rows fired and updated 1 rows PL/SQL procedure successfully completed. SQL> select * from t; no rows selected SQL> select * from myTable2;
CNT
0
SQL> SQL> SQL> SQL> drop table t; Table dropped. SQL> drop table myTable2; Table dropped.
</source>
SET TRANSACTION READ WRITE
<source lang="sql">
SQL> CREATE TABLE project (
2 pro_id NUMBER(4), 3 pro_name VARCHAR2(40), 4 budget NUMBER(9,2), 5 CONSTRAINT project_pk PRIMARY KEY (pro_id) 6 );
Table created. SQL> SQL> SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1001, "A",12345); 1 row created. SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1002, "ERP",23456); 1 row created. SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1003, "SQL",34567); 1 row created. SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1004, "CRM",45678); 1 row created. SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1005, "VPN",56789); 1 row created. SQL> SQL> SQL> CREATE TABLE server_usage (
2 pro_id NUMBER(4), 3 emp_id NUMBER, 4 time_log_date DATE, 5 hours_logged NUMBER(8,2), 6 dollars_charged NUMBER(8,2), 7 CONSTRAINT server_usage_pk PRIMARY KEY (pro_id, emp_id, time_log_date) 8 );
Table created. SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1001,101,to_date("4-Apr-2004","dd-mon-yyyy"),1123,222);
1 row created. SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1002,102,to_date("4-Apr-2005","dd-mon-yyyy"),1124,223);
1 row created. SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1003,103,to_date("4-Apr-2006","dd-mon-yyyy"),1125,224);
1 row created. SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1004,104,to_date("4-Apr-2007","dd-mon-yyyy"),1126,225);
1 row created. SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1005,105,to_date("4-Apr-2008","dd-mon-yyyy"),1127,226);
1 row created. SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1001,106,to_date("4-Apr-2009","dd-mon-yyyy"),1128,227);
1 row created. SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1002,107,to_date("4-Apr-2010","dd-mon-yyyy"),1129,228);
1 row created. SQL> SET ECHO ON SQL> SQL> SET TRANSACTION READ WRITE; SQL> SQL> SQL> INSERT INTO project
2 SELECT 2008, pro_name, budget FROM project 3 WHERE pro_id = 1002;
1 row created. SQL> SQL> SQL> UPDATE server_usage
2 SET pro_id = 2008 3 WHERE pro_id = 1002;
2 rows updated. SQL> SQL> SQL> ROLLBACK; Rollback complete. SQL> SQL> SQL> drop table project; Table dropped. SQL> drop table server_usage; Table dropped.
</source>
set transaction use rollback segment SEGMENT_NAME
<source lang="sql">
SQL> set transaction use rollback segment SEGMENT_NAME
2 / </source>
show autocommit
<source lang="sql">
SQL> SQL> set autocommit on SQL> show autocommit autocommit IMMEDIATE SQL> set autocommit 42 SQL> show autocommit AUTOCOMMIT ON for every 42 DML statements SQL> set autocommit off SQL> SQL>
</source>
TRANSACTION CONTROL
<source lang="sql">
SQL> SQL> CREATE TABLE purchase (
2 product_name VARCHAR2(25), 3 quantity NUMBER(4,2), 4 purchase_date DATE, 5 salesperson VARCHAR2(3) 6 );
Table created. SQL> SQL> SQL> INSERT INTO purchase VALUES ("Small Widget", 1, "14-JUL-03", "CA"); 1 row created. SQL> INSERT INTO purchase VALUES ("Medium Widget", 75, "14-JUL-03", "BB"); 1 row created. SQL> SQL> SQL> SELECT * FROM purchase; PRODUCT_NAME QUANTITY PURCHASE_ SAL
---------- --------- ---
Small Widget 1 14-JUL-03 CA Medium Widget 75 14-JUL-03 BB SQL> SQL> ROLLBACK; Rollback complete. SQL> SQL> SELECT * FROM purchase; no rows selected SQL> SQL> SQL> INSERT INTO purchase VALUES ("Small Widget", 1, "14-JUL-03", "CA"); 1 row created. SQL> SAVEPOINT a; Savepoint created. SQL> INSERT INTO purchase VALUES ("Medium Widget", 75, "14-JUL-03", "BB"); 1 row created. SQL> SAVEPOINT sp_2; Savepoint created. SQL> INSERT INTO purchase VALUES ("Product Number", 2, "14-JUL-03", "GA"); 1 row created. SQL> SAVEPOINT third; Savepoint created. SQL> INSERT INTO purchase VALUES ("Small Widget", 8, "15-JUL-03", "GA"); 1 row created. SQL> SAVEPOINT final_sp; Savepoint created. SQL> INSERT INTO purchase VALUES ("Medium Widget", 20, "15-JUL-03", "LB"); 1 row created. SQL> SELECT * FROM purchase; PRODUCT_NAME QUANTITY PURCHASE_ SAL
---------- --------- ---
Small Widget 1 14-JUL-03 CA Medium Widget 75 14-JUL-03 BB Product Number 2 14-JUL-03 GA Small Widget 8 15-JUL-03 GA Medium Widget 20 15-JUL-03 LB SQL> ROLLBACK TO final_sp; Rollback complete. SQL> SELECT * FROM purchase; PRODUCT_NAME QUANTITY PURCHASE_ SAL
---------- --------- ---
Small Widget 1 14-JUL-03 CA Medium Widget 75 14-JUL-03 BB Product Number 2 14-JUL-03 GA Small Widget 8 15-JUL-03 GA SQL> ROLLBACK TO third; Rollback complete. SQL> SELECT * FROM purchase; PRODUCT_NAME QUANTITY PURCHASE_ SAL
---------- --------- ---
Small Widget 1 14-JUL-03 CA Medium Widget 75 14-JUL-03 BB Product Number 2 14-JUL-03 GA SQL> ROLLBACK TO sp_2; Rollback complete. SQL> SELECT * FROM purchase; PRODUCT_NAME QUANTITY PURCHASE_ SAL
---------- --------- ---
Small Widget 1 14-JUL-03 CA Medium Widget 75 14-JUL-03 BB SQL> ROLLBACK TO a; Rollback complete. SQL> SELECT * FROM purchase; PRODUCT_NAME QUANTITY PURCHASE_ SAL
---------- --------- ---
Small Widget 1 14-JUL-03 CA SQL> ROLLBACK; Rollback complete. SQL> SELECT * FROM purchase; no rows selected SQL> SQL> SQL> drop table purchase; Table dropped.
</source>
Transaction Rollback and commit
<source lang="sql">
SQL> SQL> -- rollback and commit SQL> SQL> create table t ( x number(1) ); Table created. SQL> SQL> SQL> insert into t values ( 1 ); 1 row created. SQL> insert into t values ( 2 ); 1 row created. SQL> SQL> rollback; Rollback complete. SQL> select * from t; no rows selected SQL> insert into t values ( 1 ); 1 row created. SQL> insert into t values ( 2 ); 1 row created. SQL> commit; Commit complete. SQL> select * from t;
X
1
2
SQL> SQL> drop table t; Table dropped. SQL> SQL> SQL>
</source>
Transactions and Error Handling
<source lang="sql">
SQL> SQL> CREATE TABLE emp (
2 empID INT NOT NULL PRIMARY KEY, 3 Name VARCHAR(50) NOT NULL);
Table created. SQL> INSERT INTO emp (empID,Name) VALUES (1,"Tom"); 1 row created. SQL> INSERT INTO emp (empID,Name) VALUES (2,"Jack"); 1 row created. SQL> INSERT INTO emp (empID,Name) VALUES (3,"Mary"); 1 row created. SQL> INSERT INTO emp (empID,Name) VALUES (4,"Bill"); 1 row created. SQL> INSERT INTO emp (empID,Name) VALUES (5,"Cat"); 1 row created. SQL> INSERT INTO emp (empID,Name) VALUES (6,"Victor"); 1 row created. SQL> BEGIN
2 3 INSERT INTO emp (empID, Name) VALUES (101, "sqle"); 4 INSERT INTO emp (empID, Name) VALUES (102, "Claire"); 5 6 SAVEPOINT BeforeAddingAnne; 7 INSERT INTO emp (empID, Name) VALUES (103, "Anne"); 8 ROLLBACK TO BeforeAddingAnne; 9 10 COMMIT; 11 12 EXCEPTION 13 WHEN OTHERS 14 THEN ROLLBACK; 15 END; 16 /
PL/SQL procedure successfully completed. SQL> SQL> SQL> drop table emp; Table dropped.
</source>
Transactions and Savepoints
<source lang="sql">
SQL> SQL> SQL> CREATE TABLE emp (
2 empID INT NOT NULL PRIMARY KEY, 3 Name VARCHAR(50) NOT NULL);
Table created. SQL> INSERT INTO emp (empID,Name) VALUES (1,"Tom"); 1 row created. SQL> INSERT INTO emp (empID,Name) VALUES (2,"Jack"); 1 row created. SQL> INSERT INTO emp (empID,Name) VALUES (3,"Mary"); 1 row created. SQL> INSERT INTO emp (empID,Name) VALUES (4,"Bill"); 1 row created. SQL> INSERT INTO emp (empID,Name) VALUES (5,"Cat"); 1 row created. SQL> INSERT INTO emp (empID,Name) VALUES (6,"Victor"); 1 row created. SQL> SQL> SAVEPOINT BeforeAddingBademp; Savepoint created. SQL> INSERT INTO emp (empID, Name) VALUES (99, "Bad emp"); 1 row created. SQL> ROLLBACK TO BeforeAddingBademp; Rollback complete. SQL> SQL> COMMIT; Commit complete. SQL> SQL> SQL> SQL> drop table emp; Table dropped.
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