带有返回值的存储过程

Question

我有一个存储过程"test",看起来像:

CREATE PROCEDURE test
@name varchar(32)  
AS
DECLARE 
        @login_status  TINYINT, 
    @syb_login   varchar(20),
        @syb_pass   varchar(20)
...
..     


BEGIN   
            SELECT @status = 0
            SELECT @login as login,
                   @pass as pass,
                   @status as status   
             RETURN 0 
        END

我需要将一个输入参数"myName"作为输入参数传递给此过程,然后返回登录,传递和状态作为输出(仅来自一个记录)参数.

在JDBC中,我试着像下面这样做:

 String query = "{call test(?,?,?)}";
    System.out.println(query);
    CallableStatement proc = null;
    ResultSet rs;
    try {
        proc = connection.prepareCall(query);
        proc.setString(1, "myName");

    proc.registerOutParameter(2, java.sql.Types.VARCHAR);
    proc.registerOutParameter(3, java.sql.Types.VARCHAR);

    proc.execute();

    System.out.println(proc.getString(2));

这总是给出例外:

java.sql.SQLException: JZ0SG: A CallableStatement did not return as many output parameters as the application had registered for it.
    at com.sybase.jdbc4.jdbc.SybConnection.getAllExceptions(Unknown Source)
    at com.sybase.jdbc4.jdbc.SybStatement.handleSQLE(Unknown Source)
    at com.sybase.jdbc4.jdbc.ParamManager.nextResult(Unknown Source)
    at com.sybase.jdbc4.jdbc.ParamManager.doGetOutValueAt(Unknown Source)
    at com.sybase.jdbc4.jdbc.ParamManager.getOutValueAt(Unknown Source)
    at com.sybase.jdbc4.jdbc.SybCallableStatement.getString(Unknown Source)

我尝试使用JDBC执行带有返回值和输入/输出参数的SQL Server存储过程, https://msdn.microsoft.com/en-us/library/ms378108.aspx但这不起作用.

Answer 1

有两种方法:

1.重新定义您的程序(推荐)

创建存储过程时必须声明输出参数:

CREATE PROCEDURE test
    @name varchar(32),           
    @login varchar(32) = null output,
    @pass varchar(32) = null output,
    @status int = -1 output
AS
BEGIN   
        SET @status = 0
        SELECT @login = logincolumn,
               @pass = passcolumn
        FROM usertable

END

然后您可以将它与JDBC一起使用,如下所示:

String query = "{call test(?,?,?,?)}";
[...]
proc = connection.prepareCall(query);
proc.setString(1, "myName");
proc.registerOutParameter(2, java.sql.Types.VARCHAR);
proc.registerOutParameter(3, java.sql.Types.VARCHAR);
proc.registerOutParameter(4, java.sql.Types.INTEGER);

注意:

• 您必须set或select在声明的变量中为它们提供输出值.
• 通常,传递密码并不是一个好主意

2.从多个结果集中捕获结果(不推荐)

Connection con;
CallableStatement proc = null;
ResultSet rs;

String qry = "{call test(?)}";
proc = con.prepareCall(qry);
proc.setString(1, "name");
proc.executeQuery();

// first result set returning the status
rs = proc.getResultSet();
if (rs.next()) {
    System.out.println(rs.getString(1));
}

 // second result set returning login and pass
if (proc.getMoreResults()) {
    rs = proc.getResultSet();
    if (rs.next()) {
        System.out.println(rs.getString("login"));
        System.out.println(rs.getString("pass"));
    }
}