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環(huán)境<font face="宋體 ">：</font><font face="Times New="New" Roman="Roman" ">SQLPlus</font><font face="宋體 ">下</font> <table class="t_table" cellspacing="0"> <tbody> <tr> <td width="609"><font size="3">SQL> select * from v$version;</font> <font size="3">BANNER</font> <font size="3">----------------------------------------------------------------</font> <font size="3">Oracle9i Release 9.2.0.1.0 - Production</font> <font size="3">PL/SQL Release 9.2.0.1.0 - Production</font> <font size="3">CORE 9.2.0.1.0 Production</font> <font size="3">TNS for 32-bit Windows: Version 9.2.0.1.0 - Production</font> <font size="3">NLSRTL Version 9.2.0.1.0 - Production</font> </td></tr></tbody></table><font face="Times New="New" Roman="Roman" "></font> <strong><font face="宋體 ">問題一：</font></strong> <strong><font face="宋體 ">問題名稱</font></strong><font face="宋體 ">：輸入字符</font><font face="Times New="New" Roman="Roman" ">&</font><font face="宋體 ">的問題</font> <strong><font face="宋體 ">問題描述</font></strong><font face="宋體 ">：在</font><font face="Times New="New" Roman="Roman" ">INSERT INTO DEPARTMENT VALUES('4','Math & Science','444');</font><font face="宋體 ">插入該條記錄的時候發(fā)現(xiàn)</font><font face="Times New="New" Roman="Roman" ">&</font><font face="宋體 ">及后面的字符被忽略掉了，不能正確插入（</font><font face="Times New="New" Roman="Roman" ">department</font><font face="宋體 ">表已建立，且記錄符合約束）。</font> <strong><font face="宋體 ">問題分析</font></strong><font face="宋體 ">：在</font><font face="Times New="New" Roman="Roman" ">Oracle9i</font><font face="宋體 ">中</font><font face="Times New="New" Roman="Roman" ">&</font><font face="宋體 ">是有特殊含義的字符，默認狀態(tài)其功能為指出一個變量，故不能正確插入，若想輸入必須禁用此功能或者繞過此功能。</font> <strong><font face="宋體 ">問題<span class="t_tag" onclick="tagshow(event)" href="tag.php?name=%BD%E2%BE%F6">解決</span></font></strong><font face="宋體 ">：經(jīng)過檢索資料以及實驗發(fā)現(xiàn)有四種方法可以解決該問題。</font> <font face="Times New="New" Roman="Roman" "></font> <strong><font face="宋體 ">解決方法</font><font face="Times New="New" Roman="Roman" ">1</font></strong><font face="宋體 ">：在</font><font face="Times New="New" Roman="Roman" ">SQLPlus</font><font face="宋體 ">中使用</font><font face="Times New="New" Roman="Roman" ">set scan off</font><font face="宋體 ">命令關閉輸入檢測</font> <table class="t_table" cellspacing="0"> <tbody> <tr> <td width="595"><font size="3"> SQL>set scan off</font> <font size="3">SQL>INSERT INTO DEPARTMENT VALUES('4','Math & Science','444');</font> <font size="3"><font face="宋體 ">已創(chuàng)建</font> 1 <font face="宋體 ">行。</font></font> <font size="3">SQL> select * from department;</font> <font size="3"> </font><font size="3">DEPTID DEPTNAME FACULTYID</font> <font size="3">---------- -------------------- ----------</font> <font size="3"> 4 Math & Science 444</font> </td></tr></tbody></table><font face="Times New="New" Roman="Roman" "> </font> <strong><font face="宋體 ">解決方法</font><font face="Times New="New" Roman="Roman" ">2</font></strong><font face="宋體 ">：在</font><font face="Times New="New" Roman="Roman" ">SQLPlus</font><font face="宋體 ">中利用</font><font face="Times New="New" Roman="Roman" ">set define off</font><font face="宋體 ">命令關閉定義在符號</font><font face="Times New="New" Roman="Roman" ">&</font><font face="宋體 ">上的功能</font> <table class="t_table" cellspacing="0"> <tbody> <tr> <td width="595"><font size="3">SQL> set scan on</font> <font size="3">SQL> truncate table department;</font> <font size="3"><font face="宋體 ">表已截掉。</font></font> <font size="3">SQL> set define off</font> <font size="3">SQL>INSERT INTO DEPARTMENT VALUES('4','Math & Science','444');</font> <font size="3"><font face="宋體 ">已創(chuàng)建</font> 1 <font face="宋體 ">行。</font></font> <font size="3">SQL> select * from department;</font> <font size="3"> </font> <font size="3">DEPTID DEPTNAME FACULTYID</font> <font size="3">---------- -------------------- ----------</font> <font size="3"> 4 Math & Science 444</font> </td></tr></tbody></table><font face="Times New="New" Roman="Roman" "></font> <font face="Times New="New" Roman="Roman" "> </font><strong><font face="宋體 ">解決方法</font><font face="Times New="New" Roman="Roman" ">3</font></strong><font face="宋體 ">：利用變量輸入來繞過</font><font face="Times New="New" Roman="Roman" ">&</font><font face="宋體 ">功能</font> <table class="t_table" cellspacing="0"> <tbody> <tr> <td width="595"><font size="3">SQL> set define on</font> <font size="3">SQL> truncate table department;</font> <font size="3"><font face="宋體 ">表已截掉。</font></font> <font size="3">SQL>INSERT INTO DEPARTMENT VALUES('4',&MAJOR,'444');</font> <font size="3"><font face="宋體 ">輸入</font> major <font face="宋體 ">的值</font>: 'Math & Science'</font> <font size="3"><font face="宋體 ">原值</font>1: INSERT INTO DEPARTMENT VALUES('4',&MAJOR,'444')</font> <font size="3"><font face="宋體 ">新值</font>1: INSERT INTO DEPARTMENT VALUES('4','Math & Science','444')</font> <font size="3"><font face="宋體 ">已創(chuàng)建</font> 1 <font face="宋體 ">行。</font></font> <font size="3">SQL> select * from department;</font><font size="3"> DEPTID DEPTNAME FACULTYID</font> <font size="3">---------- -------------------- ----------</font><font size="3"> 4 Math & Science 444</font> </td></tr></tbody></table><font face="Times New="New" Roman="Roman" "></font> <strong><font face="宋體 ">解決方法</font><font face="Times New="New" Roman="Roman" ">4</font></strong><font face="宋體 ">：用</font><font face="Times New="New" Roman="Roman" ">chr</font><font face="宋體 ">函數(shù)來替換</font><font face="Times New="New" Roman="Roman" ">'&'</font><font face="宋體 ">字符</font> <table class="t_table" cellspacing="0"> <tbody> <tr> <td width="595"><font size="3">SQL> truncate table department;</font> <font size="3"><font face="宋體 ">表已截掉。</font></font> <font size="3">SQL> select ascii('&') from dual;</font> <font size="3">ASCII('&')</font> <font size="3">----------</font> <font size="3"> 38</font> <p align="left"><font size="3">SQL>INSERT INTO DEPARTMENT VALUES('4','Math '\|\|chr(38)\|\|' Science','444');</font> <font size="3"><font face="宋體 ">已創(chuàng)建</font> 1 <font face="宋體 ">行。</font></font> <font size="3">SQL> select * from department;</font><font size="3"> DEPTID DEPTNAME FACULTYID</font> <font size="3">---------- -------------------- ----------</font> <font size="3"> 4 Math & Science 444</font> </td></tr></tbody></table><font face="Times New="New" Roman="Roman" "></font><strong><font face="宋體 ">問題總結</font></strong><font face="宋體 ">：在上述問題的解決方法中方法</font><font face="Times New="New" Roman="Roman" ">1</font><font face="宋體 ">與方法</font><font face="Times New="New" Roman="Roman" ">2</font><font face="宋體 ">屬于</font><font face="Times New="New" Roman="Roman" ">SQLPlus</font><font face="宋體 ">命令類型，且只能用于</font><font face="Times New="New" Roman="Roman" ">SQLPlus</font><font face="宋體 ">環(huán)境中，通用性不夠。方法</font><font face="Times New="New" Roman="Roman" ">3</font><font face="宋體 ">需要人機交互，不適合<span class="t_tag" onclick="tagshow(event)" href="tag.php?name=%CF%B5%CD%B3">系統(tǒng)</span>的大規(guī)模的記錄。方法</font><font face="Times New="New" Roman="Roman" ">4</font><font face="宋體 ">是函數(shù)法，通用性與批處理能力都不錯，只是在可讀性方面差點。</font> <font face="Times New="New" Roman="Roman" "></font> <font face="Times New="New" Roman="Roman" "></font> <font face="Times New="New" Roman="Roman" "> B06060314</font> <font face="Times New="New" Roman="Roman" "> </font><font face="宋體 ">davelv</font>
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