java - Oracle JDBC 从过程获取 SYS_REFCURSOR

Question

我正在使用 Oracle 12g，并尝试从 SYS_REFCURSOR 获取 ResultSet

我有一个带有以下签名的过程:

CREATE OR REPLACE PROCEDURE proc_search(user IN VARCHAR2, res OUT SYS_REFCURSOR)

这是我正在使用的 Java JDBC 代码:

try {
    CallableStatement cstmt = con.prepareCall("exec proc_search(?, ?)");
    cstmt.setString(1, login);
    cstmt.registerOutParameter(2, Types.REF);
    cstmt.execute();
    ResultSet rs = (ResultSet)cstmt.getObject(2);

    while (rs.next()) {
        System.out.println(rs.getString(1));
    }
} catch (Exception e) {
    System.err.println(e);
    e.printStackTrace();
}

但是，我收到以下错误:

java.sql.SQLException: ORA-03115: unsupported network datatype or representation

Answer 1

首先，getCursor方法应该用于SYS_REFCURSOR而不是getObject

其次，prepareCall应该有BEGIN和END

代码片段

try {
    CallableStatement cstmt = con.prepareCall("BEGIN proc_search(?, ?); END;");
    cstmt.setString(1, login);
    cstmt.registerOutParameter(2, OracleTypes.CURSOR); 
    cstmt.execute();
    ResultSet rs = ((OracleCallableStatement)cstmt).getCursor(2);

    while (rs.next()) {
        System.out.println(rs.getString("name"));
    }
} catch (Exception e) {
    System.err.println(e);
    e.printStackTrace();
}

顺便说一句，必须有一个finally block 来关闭Connection、CallableStatement、ResultSet 等。

finally {
    try {
        if (con != null)
            con.close();

        if (cstmt!= null)
            cstmt.close();

        if (rs!= null)
            rs.close();

    } catch (SQLException sqlexc) {
        sqlexc.printStackTrace();
    }
}

更新1

使用CallableStatement

    Connection conn = null;
    CallableStatement callableStatement = null;
    ResultSet rs = null;

    try {
        conn = getconn();
        callableStatement = conn.prepareCall("{call proc_search(?, ?)}");    
        callableStatement.setString(1, login);
        callableStatement.registerOutParameter(2, OracleTypes.CURSOR);

        callableStatement.executeUpdate();    

        rs = (ResultSet) callableStatement.getObject(2);    
        while (rs.next()) {
            String userid = rs.getString("name");
        }

    } catch (SQLException e) {

        System.out.println(e.getMessage());
        e.printStackTrace();

    } finally {

        if (rs != null) {
            rs.close();
        }

        if (callableStatement != null) {
            callableStatement.close();
        }

        if (conn != null) {
            conn.close();
        }

    }

    }