PL/SQL 动态插入
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【中文标题】PL/SQL 动态插入【英文标题】：PL/SQL dynamic INSERT 【发布时间】：2017-06-01 15:26:17 【问题描述】：我有一个 TABLE_A，其中包含一个以逗号分隔的值作为数据的列。现在我必须将这些逗号分隔值放入 250 列的表 B 中，这必须动态完成吗？
【问题讨论】：
一个简单的“不”会是一个好的答案吗？如果没有，请查看How to Ask 和minimal reproducible example 以改进您的问题 逗号分隔值在 SQL 中并不是真正有用的格式。如果您想要将字符串拆分为行的技术，那么有quite a few suggestions on SO already。 【参考方案1】：这是一个快速而肮脏的脚本让你开始
SQL> create table T ( c clob );
Table created.
SQL>
SQL> create table t1 ( c1 varchar2(50) );
Table created.
SQL> begin
2 for i in 2 .. 250 loop
3 execute immediate 'alter table t1 add c'||i||' varchar2(50)';
4 end loop;
5 end;
6 /
PL/SQL procedure successfully completed.
SQL>
SQL> declare
2 v clob := 'somedata1';
3 begin
4 for i in 2 .. 250 loop
5 v := v || ',somedata'||i;
6 end loop;
7 insert into t
8 select v from dual connect by level <= 2000;
9 end;
10 /
PL/SQL procedure successfully completed.
SQL>
SQL> set timing on
SQL> declare
2 type t_cols is table of varchar2(100) index by pls_integer;
3 l_cols t_cols;
4
5 l_comma pls_integer;
6 l_text varchar2(32767);
7
8 l_insert_sql varchar2(4000) := 'insert into t1 values (:1';
9 begin
10 for i in 2 .. 250 loop
11 l_insert_sql := l_insert_sql || ',:'||i;
12 end loop;
13 l_insert_sql := l_insert_sql || ')';
14
15 for i in ( select rownum r, c from t ) loop
16 l_text := i.c||',';
17
18 for x in 1 .. 250 loop
19 l_comma := instr(l_text,',');
20 l_cols(x) := substr(l_text,1,l_comma-1);
21 l_text := substr(l_text,l_comma+1);
22 end loop;
23
24 execute immediate l_insert_sql
25 using
26 l_cols(1)
27 ,l_cols(2)
28 ,l_cols(3)
29 ,l_cols(4)
30 ,l_cols(5)
31 ,l_cols(6)
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85 ,l_cols(60)
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149 ,l_cols(124)
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158 ,l_cols(133)
159 ,l_cols(134)
160 ,l_cols(135)
161 ,l_cols(136)
162 ,l_cols(137)
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170 ,l_cols(145)
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195 ,l_cols(170)
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197 ,l_cols(172)
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200 ,l_cols(175)
201 ,l_cols(176)
202 ,l_cols(177)
203 ,l_cols(178)
204 ,l_cols(179)
205 ,l_cols(180)
206 ,l_cols(181)
207 ,l_cols(182)
208 ,l_cols(183)
209 ,l_cols(184)
210 ,l_cols(185)
211 ,l_cols(186)
212 ,l_cols(187)
213 ,l_cols(188)
214 ,l_cols(189)
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218 ,l_cols(193)
219 ,l_cols(194)
220 ,l_cols(195)
221 ,l_cols(196)
222 ,l_cols(197)
223 ,l_cols(198)
224 ,l_cols(199)
225 ,l_cols(200)
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227 ,l_cols(202)
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230 ,l_cols(205)
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268 ,l_cols(243)
269 ,l_cols(244)
270 ,l_cols(245)
271 ,l_cols(246)
272 ,l_cols(247)
273 ,l_cols(248)
274 ,l_cols(249)
275 ,l_cols(250);
276
277 end loop;
278
279 end;
280 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.11
SQL>
【讨论】：
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