ibatis与存储过程(带输出参数的存储过程)

WindySky 2011-06-15

展开全文

全部是针对Microsoft SQL Server 2000的Stored Procedure的例子：
参照《iBATIS in Action》书写：
1. max_in_example
Stored Procedure:

CREATE PROCEDURE [dbo].[max_in_example]
@a INTEGER = 0 OUTPUT,
@b INTEGER = 0 OUTPUT,
@c INTEGER = 0 OUTPUT
AS

BEGIN
       IF (@a > @b)
              SET @c = @a
       ELSE
              SET @c = @b
       RETURN @c
END
GO

SqlMap:

<parameterMap id="pm_in_example" class="java.util.Map">
       <parameter property="c" javaType="int" jdbcType="INTEGER"
           mode="OUT" />
       <parameter property="a" javaType="int" jdbcType="INTEGER" />
       <parameter property="b" javaType="int" jdbcType="INTEGER" />

    </parameterMap>
    <procedure id="in_example" parameterMap="pm_in_example"
       resultClass="int">
       { ? = call max_in_example(?, ?) }
    </procedure>

Java Code:

publicstatic Integer getMax_in_example(int a, int b) throws SQLException {
    Map<String, Integer> m = new HashMap<String, Integer>(2);
    m.put("a", new Integer(a));
    m.put("b", new Integer(b));
    m.put("c", new Integer(0));
    //执行存储过程in_example
    sqlMapper.queryForObject("in_example", m);

    return m.get("c");
}

2. swap
Stored Procedure:

CREATE PROCEDURE [dbo].[swap]
@a INTEGER OUTPUT,
@b INTEGER OUTPUT

AS

BEGIN
       DECLARE @temp INTEGER

       SET @temp = @a
       SET @a = @b
       SET @b = @temp
END
GO

SqlMap:

Java Code:

publicstatic Map swap(int a, int b) throws SQLException {
    Map<String, Integer> m = new HashMap<String, Integer>(2);
    m.put("a", new Integer(a));
    m.put("b", new Integer(b));

    //执行存储过程swap
    sqlMapper.queryForObject("swapProcedure", m);

    return m;
}

3. maximum
Stored Procedure:

CREATE PROCEDURE [dbo].[maximum]
@a INT OUTPUT,
@b INT OUTPUT,
@c INT OUTPUT

AS

BEGIN
    IF(@a > @b)
         SET @c = @a

    IF(@b >= @a)
         SET @c = @b
END
GO

SqlMap:

<parameterMap id="maxOutProcedureMap" class="java.util.Map">
    <parameter property="a" mode="IN" />
    <parameter property="b" mode="IN" />
    <parameter property="c" jdbcType="INTEGER" mode="OUT" />
</parameterMap>
<procedure id="maxOutProcedure"parameterMap="maxOutProcedureMap">
       { call maximum (?, ?, ?) }
</procedure>

Java Code:

publicstatic Integer maximum(int a, int b) throws SQLException {
    Map<String, Integer> m = new HashMap<String, Integer>(2);
    m.put("a", new Integer(a));
    m.put("b", new Integer(b));
    m.put("c", new Integer(0));

    //执行存储过程maximum
    sqlMapper.queryForObject("maxOutProcedure", m);

    return m.get("c");
}

以上的Java Code类方法都是写在相应的ProcedureDAOImpl类中，可以通过ProcedureDAOImpl类调用相应得方法和传入对应参数来与数据库存储过程交互。

注意：在SqlMap.xml文件中<parameterMap>中参数的顺序跟<Procedure>中”?”的顺序一致。
如：a, b, c; ? = procedurename(?, ?) 则，第一个问号表示a，依次类推。