Php 返回过多重复项的游标

我的程序似乎有问题。这是一个搜索，它得到了正确的搜索结果，但多次返回相同的答案，导致内存耗尽的致命错误。这是我的代码：

FUNCTION pet_search(PETTYPE in VARCHAR2, BREED in VARCHAR2, COLOR in VARCHAR2, PETSIZE in VARCHAR2, TS in VARCHAR2, ENERGY in VARCHAR2, SPACE in VARCHAR2)
       RETURN SYS_REFCURSOR
       IS 
          pet_search_result SYS_REFCURSOR; 
          type_id NUMBER;
          breed_id NUMBER;
          color_id NUMBER;
          size_id NUMBER;  
          TS_id NUMBER; 
          energy_id NUMBER; 
          space_id NUMBER;

       BEGIN  

       select TP.pet_type_code into type_id
       from dbadmin.petType TP
       where TP.pet_type_name = PETTYPE;

       select B.pet_race_code into breed_id
       from dbadmin.petRace B
       where B.pet_race_name = BREED;

      select PC.pet_color_code into color_id
      from dbadmin.PetColor PC
      where PC.pet_color = COLOR;

      select PS.pet_size_code into size_id
      from dbadmin.PetSize PS
      where PS.pet_size = PETSIZE;  

      select LS.pet_learn_code into TS_id
      from dbadmin.petlearningskill LS
      where LS.pet_learn_skill = TS;

      select EN.pet_energy_code into energy_id
       from dbadmin.petEnergy EN
       where EN.pet_energy_level = ENERGY;

       select SP.pet_space_code into space_id
       from dbadmin.petSpace SP
       where SP.pet_space = SPACE; 

    OPEN pet_search_result FOR select pet_type_name, pet_race_name, pet_cond_name, pet_energy_level, pet_learn_skill, vet_name, person_name, petlocation, petnotes, petabandondescription, pet_space, pet_treatment, pet_color, pet_sickness_name, pet_med_name
    from pet, pettype, petrace, petCondition, petSize,petEnergy, petlearningskill, veterinary, person, petSpace, pettreatments, petcolor, petsickness, petmedicine
    WHERE pettype.pet_type_code = type_id
    AND petrace.pet_race_code = breed_id  
    AND pet.pet_color_code = color_id
    AND pet.pet_size_code = size_id  
    AND pet.pet_learn_code = TS_id 
    AND pet.pet_energy_code = energy_id 
    AND pet.petspace_id = space_id;
        RETURN pet_search_result; 

      EXCEPTION 
        WHEN NO_DATA_FOUND THEN 
          RETURN null;
      END; 

END pet_search_package; 

你能看出我的错误吗？

---

如果您有任何建议，我们将不胜感激。

问题似乎出在select查询中，如果您的where子句没有完全满足所有条件，那么由于连接，这些行将被复制。。 请参阅下面的示例，说明问题以及如何解决问题

select pet_type_name, pet_race_name, pet_cond_name, pet_energy_level, pet_learn_skill, vet_name, person_name, petlocation, petnotes, petabandondescription, pet_space, pet_treatment, pet_color, pet_sickness_name, pet_med_name
    from pet, pettype, petrace, petCondition, petSize,petEnergy, petlearningskill, veterinary, person, petSpace, pettreatments, petcolor, petsickness, petmedicine
    WHERE pettype.pet_type_code = type_id
    AND petrace.pet_race_code = breed_id  
    AND pet.pet_color_code = color_id
    AND pet.pet_size_code = size_id  
    AND pet.pet_learn_code = TS_id 
    AND pet.pet_energy_code = energy_id 
    AND pet.petspace_id = space_id;

例如，这里有两个表emp和dept

        SQL> select * from emp;

      EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
 ---------- ---------- --------- ---------- --------- ---------- ---------- ----------
       7369 SMITH      CLERK           7902 17-DEC-80        800                    20
       7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
       7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
       7566 JONES      MANAGER         7839 02-APR-81       2975                    20
       7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
       7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
       7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
       7788 SCOTT      ANALYST         7566 19-APR-87       3000                    20
       7839 KING       PRESIDENT            17-NOV-81       5000                    10
       7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
       7876 ADAMS      CLERK           7788 23-MAY-87       1100                    20
       7900 JAMES      CLERK           7698 03-DEC-81        950                    30
       7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
       7934 MILLER     CLERK           7782 23-JAN-82       1300                    10

 14 rows selected.

SQL> select * from dept;

    DEPTNO DNAME          LOC
---------- -------------- -------------
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 SALES          CHICAGO
        40 OPERATIONS     BOSTON

如果满足where子句中的所有条件，此查询将仅返回1行

SQL> select a.empno,b.deptno,a.ename from emp a,dept b where a.empno=7369 and b.deptno=20;

     EMPNO     DEPTNO ENAME
---------- ---------- ----------
      7369         20 SMITH

在这里，如果where子句的条件不完全匹配，或者微分器的数量较少，它将返回重复项

SQL> select a.empno,b.deptno,a.ename from emp a,dept b where a.empno=7369 ;

      EMPNO     DEPTNO ENAME
  --------- ---------- ----------
       7369         10 SMITH
       7369         20 SMITH
       7369         30 SMITH
       7369         40 SMITH

---

如果这些表之间有一个引用，那么建议在where子句中使用它，然后比较在主查询的FROM子句中包含十几个左右的引用数据表。但您不限制它们，因此它们将返回所有行。此外，您不需要将它们加入数据表，PET。这将导致交叉联接或笛卡尔积，它为来自这些表的记录的每个组合生成一行

这里是您的查询重写，以便清楚地了解发生了什么，也使其正常工作：

OPEN pet_search_result FOR 
    select pet_type_name
            , pet_race_name
            , pet_cond_name
            , pet_energy_level
            , pet_learn_skill
            , vet_name
            , person_name
            , petlocation
            , petnotes
            , petabandondescription
            , pet_space
            , pet_treatment
            , pet_color
            , pet_sickness_name
            , pet_med_name
    from pet
        join pettype TP
            on pet.pet_type_code = TP.pet_type_code
        join petrace B
            on pet.pet_race_code = B.pet_race_code
        join petSize PS
            on pet.pet_size_code = PS.pet_size_code
        join petEnergy EN
            on pet.pet_energy_code = EN.pet_energy_code
        join petcolor pc
            on pet.pet_color_code = PC.pet_color_code
        join petlearningskill LS
            on pet.pet_learn_code = LS.pet_learn_code 
        join petSpace SP
            on pet.petspace_id = SP.pet_space_code
    where TP.pet_type_name = PETTYPE
    and   B.pet_race_name = BREED
    and   PS.pet_size = PETSIZE
    and   PC.pet_color = COLOR
    and   EN.pet_energy_level = ENERGY
    and   LS.pet_learn_skill = TS
    and   SP.pet_space = SPACE;

以这种方式编写意味着您可以在过程开始时放弃所有这些小查找

我省略了下列表格。您没有提供任何限制它们的条件，因此它们不会影响结果集

• pet治疗

• petCondition

• petsick

• petmedicine

• 兽医

• person

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您正在连接14个没有正确连接条件的表。再次检查光标查询。简而言之，您只为pet、pettype和petreace表提供了where条件，其他11个表呢？