Home Database Mysql Tutorial [置顶] ORACLE编程的套路字符串分解

[置顶] ORACLE编程的套路字符串分解

Jun 07, 2016 pm 02:51 PM
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作 者按,字符串分解在ORACLE编程中可用于词、字的解析,继而可实现单词搜索的合并,为基础代码。 代码如下,作者保留所有权。 create or replace function FUN_STRING_SPLIT ( v_string IN VARCHAR2, v_sep IN VARCHAR2) return fs.stringList IS/*********

者按,字符串分解在ORACLE编程中可用于词、字的解析,继而可实现单词搜索的合并,为基础代码。

代码如下,作者保留所有权。

create or replace function FUN_STRING_SPLIT (
       v_string IN VARCHAR2, 
       v_sep IN VARCHAR2)
  return fs.stringList IS
/***************************************************************************/
/*                                                                         */
/* 字符串分割函数 for ORACLE                                               */
/* @param v_string 母字符串                                                   */
/* @param v_sep 分隔符                                                     */
/* @return                字符串列表                                       */
/*   TYPE stringList IS TABLE OF VARCHAR2(256) INDEX BY BINARY_INTEGER;    */
/* @author foolstudio@qq.com                                               */
/* All rights reserved. 未经许可,不得用于商业用途                         */
/*                                                                         */
/***************************************************************************/

  --分隔符长度
  C_LEN int;
  --删除空格后的字符串
  v_str varchar2(256);
  --分隔符位置
  v_pos int;
  --子字符串
  v_sub varchar2(256);
  --数组计数器
  v_i int;
  --结果
  Result fs.stringList;

BEGIN

   v_str := TRIM(v_string);
   --dbms_output.put_line(v_str);
   v_pos := INSTR(v_str, v_sep);
   v_i := 0;
   C_LEN := LENGTH(v_sep);

   --无匹配,整字符串返回
   IF v_pos  0 THEN
      Result(v_i) := v_str;
      return Result;
   END IF;

   WHILE v_pos > 0 LOOP

      v_sub := SUBSTR(v_str, 0, v_pos-1);

      --添加到结果数组
      IF LENGTH(v_sub) > 0 THEN
         Result(v_i) := v_sub;
         v_i := v_i+1;
      END IF;

      --dbms_output.put_line(v_sub);
      v_str := SUBSTR(v_str, v_pos+C_LEN);
      --dbms_output.put_line(v_str);
      v_pos := INSTR(v_str, v_sep);

   END LOOP;

    --已无匹配,剩余字符串添加到结果数组
    IF LENGTH(v_str) > 0 THEN
       Result(v_i) := v_str;
    END IF;

    --调试输出结果
    dbms_output.put_line('列表项数量: '||result.count() );
    dbms_output.put_line('--['||v_string||'] split by ['||v_sep||']--');
    v_i := 0;
    FOR v_i IN 0..(result.count()-1) LOOP
        dbms_output.put_line('('||v_i||'): '||result(v_i) );
   end loop;

   --返回结果数组
   return  Result;

END FUN_STRING_SPLIT;
Copy after login

代码注释相当详细,不再对代码进行解释。

经测试,代码支持ORACLE 10及以上版本。

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