How can i call a function that return a BOOLEAN using MyBatis?

问题

i'm using MyBatis to call a function in a PL SQL database. The function have one of the OUT parameter as BOOLEAN like this:

FUNCTION f_foo_function(foo IN VARCHAR, foo_output OUT BOOLEAN, error OUT VARCHAR2)

My problem is when i try to call the function from my xml mapper, every try i do mybatis don't recognize the boolean output and throw me and error like incompatible types. Also when i try to test the function from PLSQL Developer it make a convertion like this :pout_boolean_result := sys.diutil.bool_to_int(pout_boolean_result); and return me the boolean as a bit.

It is posible to ignore that integer and specify MyBatis to treat the ouput as a boolean? How can i do that?

My xml is something like this:

<select id="getFooFunction" statementType="CALLABLE">
        {#{result, mode=OUT, jdbcType=INTEGER} = call f_foo_function
        (
            #{foo, mode=IN, jdbcType=VARCHAR},
            #{foo_output, mode=OUT, jdbcType=DOUBLE},
            #{error, mode=OUT, jdbcType=VARCHAR}
        )
        }
</select>

回答1:

To test it, I defined the function as follows.

create or replace function f_foo_function(
  foo in varchar, 
  foo_output out integer, 
  error out varchar2
) return integer is
begin
    foo_output := 1;
    error := 'No error';
  return 99;
end;

foo_output is defined as INTEGER as BOOLEAN is invalid as APC pointed out.

The mapper method is defined as...

void getFooFunction(FooFuncParam param);

The parameter is a POJO.

public class FooFuncParam {
  private Integer result;
  private String foo;
  private boolean fooOutput;
  private String error;
  // getters/setters
}

And here is the mapper statement.

<update id="getFooFunction" statementType="CALLABLE">
  {#{result,jdbcType=INTEGER,mode=OUT} = call f_foo_function(
    #{foo,mode=IN},
    #{fooOutput,jdbcType=INTEGER,javaType=_boolean,mode=OUT}, 
    #{error,jdbcType=VARCHAR,mode=OUT})}
</update>

Note that javaType is specified to convert INTEGER to boolean.
If the function sets 0 to foo_output, false is set to FooFuncParam.fooOutput. And non-zero value means true. If necessary, you can write a custom type handler to change the behavior.

Here is an executable demo tested with Oracle 18c and ojdbc 19.3.0.0.

来源：https://stackoverflow.com/questions/58205549/how-can-i-call-a-function-that-return-a-boolean-using-mybatis

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