从Java访问存储过程的%ROWTYPE

时间:2014-10-01 12:23:05

标签: java oracle jdbc plsql

我有一个类似的存储过程:

 PROCEDURE get_curx(    p_buf     IN  ni_imsi%ROWTYPE,
                        p_bufx    IN  ni_imsi%ROWTYPE,
                        p_cur     OUT CurTyp,
                        p_where   IN  VARCHAR2 DEFAULT '',
                        p_orderby IN  VARCHAR2 DEFAULT '',
                        p_max     IN  NUMBER   DEFAULT 0,
                        p_lock    IN  NUMBER   DEFAULT 0,
                        p_hint    IN  VARCHAR2 DEFAULT 'NONE',
                        p_debug   IN  NUMBER   DEFAULT 0,
                        p_count   IN  BOOLEAN  DEFAULT FALSE);

我从这样的JAVA程序中调用此程序

CallableStatement cs = connection.prepareCall("{call ni_imsi_pkg.get_curx(?,?,?,?,?,?)}");

            cs.setObject( 1, ? );  // i have no clue what to mention here
            cs.setObject( 2, ? );  //i have no clue what to mention here

            cs.registerOutParameter(3, OracleTypes.CURSOR);
            cs.setString(4, " WHERE current_state = 60000 AND rownum <= 2 ");
            cs.setString(5, " ORDER BY imsi_number");
            cs.setInt(6, 5);

但我不知道如何设置前两个参数。请帮帮我。谢谢

1 个答案:

答案 0 :(得分:4)

正如Mike所说,你不能在JDBC调用中直接引用行类型,因为行类型只在PL / SQL中有效,并且驱动程序使用的所有类型都必须在SQL级别定义。

您可以定义自己的SQL对象类型,它会影响您的表结构(如果表被更改,您必须记住更新),以及采用该类型并将其转换为对您的实际调用的包装程序程序。这是一个基于dual的演示,因为我不知道你真正的表结构:

create type ni_imsi_rowtype as object (dummy varchar2(1)) -- use your real table's columns/types
/

create package ni_imsi_pkg as
  procedure get_curx(p_buf dual%rowtype, p_cur out sys_refcursor);
  procedure get_curx_wrapper(p_buf ni_imsi_rowtype, p_cur out sys_refcursor);
end ni_imsi_pkg;
/

create package body ni_imsi_pkg as
  -- original procedure, simplified for demo
  procedure get_curx(p_buf dual%rowtype, p_cur out sys_refcursor) is
  begin
    open p_cur for select * from dual where dummy = p_buf.dummy;
  end;

  -- wrapper procedure taking new type instead of rowtype
  procedure get_curx_wrapper(p_buf ni_imsi_rowtype, p_cur out sys_refcursor) is
    l_buf dual%rowtype;
  begin
    l_buf.dummy := p_buf.dummy;
    get_curx(l_buf, p_cur);
  end;
end ni_imsi_pkg;
/

然后在Java端,您可以填充并将其作为STRUCT发送:

// Object array containing the values corresponding to your row type
Object[] rowObj = { "X" };
// Struct based on the SQL type you created
StructDescriptor structDesc = StructDescriptor.createDescriptor("NI_IMSI_ROWTYPE", conn);
STRUCT rowStruct = new STRUCT(structDesc, conn, rowObj);

// Call wrapper function instead of real one
cs = conn.prepareCall("{ call ni_imsi_pkg.get_curx_wrapper(?,?) }");
// Pass the struct defined earlier
cs.setObject(1, rowStruct);
cs.registerOutParameter(2, OracleTypes.CURSOR);
// and other arguments for your real calll

如果您无法修改您的真实包,那么您可以为包装器创建一个新包,或者一个简单的过程;或者您甚至可以在匿名块中进行转换,但这会使Java代码更加复杂:

cs = (OracleCallableStatement) conn.prepareCall(
    "declare l_typ ni_imsi_rowtype; l_buf dual%rowtype; "
        + "begin l_typ := ?; l_buf.dummy := l_typ.dummy; ni_imsi_pkg.get_curx(l_buf, ?); "
        + "end;"
);

...仍然绑定相同的结构,因此仍然需要SQL类型。只有语句发生了变化,但它现在可以在没有包装器的情况下调用原始过程。