Question

我有一个plsql函数，它返回记录类型challan_rec。

create or replace package xx_bal_api as
    type challan_rec is record (
        challan_number varchar2(40),
        challan_amount number
    );


    FUNCTION get_challan(foo number) return challan_rec;
end;



create or replace package body xx_bal_api as

    FUNCTION get_challan(foo number) return challan_rec
    is
    cr challan_rec;
    begin
        cr.challan_number := '00002154215'; 
        cr.challan_amount := 2265;
        return cr;
    end get_challan;
end;

我想从java代码调用此函数并在java中获取该记录类型。请指导我如何做到这一点。感谢

Answer 1

首先，您只能调用从Java返回SQL对象的函数，而不是PLSQL对象。所以相应地改变你的challan_rec。整个过程应包括以下4个步骤。

在架构级别（不在包中）创建对象类型。此外，您的类型应为OBJECT类型，而不是RECORD。
```
CREATE OR REPLACE TYPE Some_schema.chellan_rec IS OBJECT (
challan_number varchar2(40),
challan_amount number
)
```

2。更改函数get_chellan以返回此对象

实现SQLData接口

public class Chellan_Rec implements SQLData{

//override readSQL, writeSQL and getSQLTypeName methods
}

从Java代码中调用PLSQL

ResultSet rs=null;
CallableStatement stmt=null;
Chellan_Rec rec = null;
try{

  String sqlQuery = "{call get_chellan(?,?)}";

//map plsql type to Java type
  Map m = conn.getTypeMap();
  m.put("schema_name.chellan_rec", Class.forName("some_java_package.Chellan_Rec"));//this maps the Java class to the Oracle custom type
  conn.setTypeMap(m);

  stmt=conn.prepareCall(sqlQuery);
  stmt.registerOutParameter(1, Types.STRUCT, "chellan_rec");
  stmt.setObject(2, fooNum);
  stmt.execute();    

  rec = (Chellan_Rec)stmt.getObject(1);

}catch(Exception e){
  //log the exception;
}

Answer 2

首先让我们开始纠正您的代码。我可以看到你发布的代码不会编译，会引发问题。正确的代码如下：

CREATE OR REPLACE PACKAGE xx_bal_api
AS
   TYPE challan_rec IS RECORD
   (
      challan_number   VARCHAR2 (40),
      challan_amount   NUMBER
   );

   TYPE rec IS TABLE OF challan_rec index by pls_integer;

   FUNCTION get_challan (foo NUMBER)
      RETURN rec;
END;
/
CREATE OR REPLACE PACKAGE BODY xx_bal_api
AS
   FUNCTION get_challan (foo NUMBER)
      RETURN rec
   IS
      cr   rec;
   BEGIN
      cr (1).challan_number := '00002154215';
      cr (1).challan_amount := foo;
      RETURN cr;
   END get_challan;
END;

执行此代码时，您可能会面临invalid datatype等问题。这是因为RECORD仅限于PLSQL内使用。

select xx_bal_api.get_challan(2265) from dual;

ORA-00902：数据类型无效

执行此操作的最佳方法是创建对象的OBJECT和TYPE，然后在函数中创建return：

CREATE OR REPLACE TYPE challan_rec IS OBJECT
(
   challan_number VARCHAR2 (40),
   challan_amount NUMBER
);
/    
CREATE OR REPLACE Type rec is table of challan_rec;
/ 
 CREATE OR REPLACE FUNCTION get_challan(foo number) 
    return rec
  is  
    cr rec:=rec();

   begin
        cr.extend();
        cr(1):= challan_rec('00002154215',foo);        
        return cr;
   end get_challan;   
end;

/

执行：

SQL> select get_challan(2265) from dual;
     /

从java中的plsql函数获取返回的记录类型

2 个答案: