在sqlplus中執(zhí)行的sql出錯(cuò)之后應(yīng)該如何處理和對(duì)應(yīng)，多行sql語(yǔ)句或者存儲(chǔ)過(guò)程的信息如何進(jìn)行錯(cuò)誤定位，這篇文章將結(jié)合實(shí)例進(jìn)行簡(jiǎn)單地說(shuō)明。
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如何進(jìn)行錯(cuò)誤定位
場(chǎng)景：
假如有3行insert的sql語(yǔ)句，中間一行出錯(cuò)之后，后續(xù)繼續(xù)執(zhí)行的情況下，如何定位到第二行？
dbms_utility.format_error_backtrace
通過(guò)使用dbms_utility.format_error_backtrace可以得到ERROR at line xxx:的信息，這對(duì)我們較為有用，我們接下來(lái)進(jìn)行確認(rèn)
oracle@e871d42341c0:~$ sqlplus system/abcd1234@XE <<EOF> SET SERVEROUTPUT ON> desc student> delete from student;> select * from student;> insert into student values (1001, 'liumiaocn');> insert into student values (1001, 'liumiao');> insert into student values (1003, 'michael');> select * from student;> commit;> exec dbms_output.put_line(dbms_utility.format_error_backtrace);> EOFSQL*Plus: Release 11.2.0.2.0 Production on Sun Oct 21 13:06:07 2018Copyright (c) 1982, 2011, Oracle. All rights reserved.Connected to:Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit ProductionSQL> SQL> Name Null? Type ----------------------------------------- -------- ---------------------------- STUID NOT NULL NUMBER(4) STUNAME VARCHAR2(50)SQL> 2 rows deleted.SQL> no rows selectedSQL> 1 row created.SQL> insert into student values (1001, 'liumiao')*ERROR at line 1:ORA-00001: unique constraint (SYSTEM.SYS_C007024) violatedSQL> 1 row created.SQL> STUID STUNAME---------- -------------------------------------------------- 1001 liumiaocn 1003 michaelSQL> Commit complete.SQL> PL/SQL procedure successfully completed.SQL> Disconnected from Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Productionoracle@e871d42341c0:~$
可以看到，報(bào)錯(cuò)的時(shí)候提示了行號(hào)，但是行號(hào)是1，這是因?yàn)檫@種寫(xiě)法以一行為單位，自然是如此，如果是單個(gè)多行的存儲(chǔ)過(guò)程，將會(huì)更加清晰。
ERROR at line 1:ORA-00001: unique constraint (SYSTEM.SYS_C007024) violated
所以我們將這個(gè)例子進(jìn)行改造，三行insert的sql放到文件之中，然后在使用dbms_utility.format_error_backtrace來(lái)進(jìn)行確認(rèn)
oracle@e871d42341c0:~$ cat /tmp/sqltest1.sql desc studentdelete from student;select * from student;insert into student values (1001, 'liumiaocn');insert into student values (1001, 'liumiao');insert into student values (1003, 'michael');select * from student;commit;oracle@e871d42341c0:~$
然后在嘗試一下是否能夠確認(rèn)行號(hào)，會(huì)發(fā)現(xiàn)仍然不能精確定位：
oracle@e871d42341c0:~$ sqlplus system/abcd1234@XE <<EOF> SET SERVEROUTPUT ON> @/tmp/sqltest1.sql> exec dbms_output.put_line(dbms_utility.format_error_backtrace);> EOFSQL*Plus: Release 11.2.0.2.0 Production on Sun Oct 21 13:08:27 2018Copyright (c) 1982, 2011, Oracle. All rights reserved.Connected to:Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit ProductionSQL> SQL> Name Null? Type ----------------------------------------- -------- ---------------------------- STUID NOT NULL NUMBER(4) STUNAME VARCHAR2(50)2 rows deleted.no rows selected1 row created.insert into student values (1001, 'liumiao')*ERROR at line 1:ORA-00001: unique constraint (SYSTEM.SYS_C007024) violated1 row created. STUID STUNAME---------- -------------------------------------------------- 1001 liumiaocn 1003 michaelCommit complete.SQL> PL/SQL procedure successfully completed.SQL> Disconnected from Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Productionoracle@e871d42341c0:~$
因?yàn)閐bms_utility.format_error_backtrace更多的場(chǎng)景是在于存儲(chǔ)過(guò)程的錯(cuò)誤定位，接下來(lái)我們使用一個(gè)簡(jiǎn)單的存儲(chǔ)過(guò)程例子來(lái)進(jìn)行確認(rèn)錯(cuò)誤行號(hào)定位, 先看一個(gè)正常的存儲(chǔ)過(guò)程，把上面的內(nèi)容稍微修改一下：
oracle@e871d42341c0:~$ cat /tmp/addstudent.sql create or replace PROCEDURE addstudentsISstudent_count number;BEGINdelete from student;select count(*) into student_count from student;dbms_output.put('sql set count before :');dbms_output.put_line(student_count);insert into student values (1001, 'liumiaocn');insert into student values (1002, 'liumiao');insert into student values (1003, 'michael');select count(*) into student_count from student;dbms_output.put('sql set count after :');dbms_output.put_line(student_count);END;/exec addstudents();oracle@e871d42341c0:~$結(jié)果執(zhí)行信息如下
oracle@e871d42341c0:~$ sqlplus system/liumiao123 <<EOFset serveroutput on;@/tmp/addstudent.sql EOFSQL*Plus: Release 11.2.0.2.0 Production on Mon Oct 22 04:42:11 2018Copyright (c) 1982, 2011, Oracle. All rights reserved.Connected to:Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit ProductionSQL> SQL> Procedure created.sql set count before :0sql set count after :3PL/SQL procedure successfully completed.SQL> Disconnected from Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Productionoracle@e871d42341c0:~$
接下來(lái)我們修改一下內(nèi)容，使得第二行主鍵重復(fù)
oracle@e871d42341c0:~$ cat /tmp/addstudent.sqlcreate or replace PROCEDURE addstudentsISstudent_count number;BEGINdelete from student;select count(*) into student_count from student;dbms_output.put('sql set count before :');dbms_output.put_line(student_count);insert into student values (1001, 'liumiaocn');insert into student values (1001, 'liumiao');insert into student values (1003, 'michael');select count(*) into student_count from student;dbms_output.put('sql set count after :');dbms_output.put_line(student_count);END;/exec addstudents();oracle@e871d42341c0:~$ 再次執(zhí)行，自然會(huì)出錯(cuò)，但是可以看到，正確報(bào)出了所在行數(shù)，這是procedure的機(jī)制提示的信息
oracle@e871d42341c0:~$ sqlplus system/liumiao123 <<EOFset serveroutput on;@/tmp/addstudent.sql EOFSQL*Plus: Release 11.2.0.2.0 Production on Mon Oct 22 04:44:25 2018Copyright (c) 1982, 2011, Oracle. All rights reserved.Connected to:Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit ProductionSQL> SQL> Procedure created.sql set count before :0BEGIN addstudents(); END;*ERROR at line 1:ORA-00001: unique constraint (SYSTEM.SYS_C007024) violatedORA-06512: at "SYSTEM.ADDSTUDENTS", line 10ORA-06512: at line 1SQL> Disconnected from Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Productionoracle@e871d42341c0:~$
可以看到，ORA-06512: at “SYSTEM.ADDSTUDENTS”, line 10的信息就是我們期待的信息，提示出在這個(gè)存儲(chǔ)過(guò)程的第10行執(zhí)行出現(xiàn)問(wèn)題，而實(shí)際可以使用dbms_utility.format_error_backtrace結(jié)合exception給出更為清晰地方式，比如：
oracle@e871d42341c0:~$ cat /tmp/addstudent.sql create or replace PROCEDURE addstudentsISstudent_count number;BEGINdelete from student;select count(*) into student_count from student;dbms_output.put('sql set count before :');dbms_output.put_line(student_count);insert into student values (1001, 'liumiaocn');insert into student values (1001, 'liumiao');insert into student values (1003, 'michael');select count(*) into student_count from student;dbms_output.put('sql set count after :');dbms_output.put_line(student_count);exceptionwhen others thendbms_output.put('exception happend with line info : ');dbms_output.put_line(dbms_utility.format_error_backtrace);END;/exec addstudents();oracle@e871d42341c0:~$執(zhí)行結(jié)果確認(rèn)：
oracle@e871d42341c0:~$ sqlplus system/liumiao123 <<EOFset serveroutput on;@/tmp/addstudent.sql EOFSQL*Plus: Release 11.2.0.2.0 Production on Mon Oct 22 04:49:27 2018Copyright (c) 1982, 2011, Oracle. All rights reserved.Connected to:Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit ProductionSQL> SQL> Procedure created.sql set count before :0exception happend with line info : ORA-06512: at "SYSTEM.ADDSTUDENTS", line 10PL/SQL procedure successfully completed.SQL> Disconnected from Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Productionoracle@e871d42341c0:~$
這樣則可以看出能夠比較清晰地進(jìn)行錯(cuò)誤的定位了，但是由于功能受限，所以實(shí)際使用場(chǎng)景仍然較為有限，但是定位存儲(chǔ)過(guò)程的信息則可以使用dbms_utility.format_error_backtrace等進(jìn)行確認(rèn)。
小結(jié)
多行sql執(zhí)行定位可以考慮拆成單行來(lái)確認(rèn)，而存儲(chǔ)過(guò)程則可結(jié)合format_error_backtrace等進(jìn)行確認(rèn)以提供問(wèn)題出現(xiàn)的所在行號(hào)。
總結(jié)
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