如何在JDBC中调用存储过程 [英] How to call a stored procedure in JDBC

问题描述

对于家庭作业，我必须创建一个pl/sql存储过程以向数据库中添加常规成员

For homework I have to create a pl/sql stored procedure to add a facutly member to a database

CREATE OR REPLACE PROCEDURE ADDFACULTYDEPTSAL
  (facid IN NUMBER,
  facname IN VARCHAR,
  depID IN NUMBER)
AS
  sal NUMBER;
BEGIN
  CALCSALDEPT(depID, sal);
  IF sal >= 50000
  THEN 
    sal := sal*.9;
  ELSE
    IF sal >= 30000
    THEN
      sal := sal*.8;
    END IF;
  END IF;

  INSERT INTO FACULTY(fid, fname, deptid, salary)
  VALUES(facid, facname, depID, sal);
END ADDFACULTYDEPTSAL;

要做到这一点，我需要对上述过程进行java调用，我已经很累了:

Having done that, I need to make a java call for said procedure, which I've tired to do with:

Statement stmt = dbConnection.createStatement();
String in;
if(a == 1){
    in = "ADDFACULTYDEPTSAL("
        + fid.getText() + "','"
        + fname.getText() + "','"
        + did.getText() + "')";
} else {
    in = "ADDFACULTYUNISAL("
        + fid.getText() + "','"
        + fname.getText() + "','"
        + did.getText() + "')";
}
stmt.executeQuery(in);

我在try catch块中有上述内容，该块不断引发错误.我根据在其他网站上看到的内容，对字符串"in"尝试了几种变体: in ="{致电ADDFACULTYDEPSAL ... in =调用ADDFACULTYDEPSAL ...

I have the above in a try catch block that keeps throwing an error. I have tried several variants on the string "in" based on what I saw on other websites: in = "{call ADDFACULTYDEPSAL ... in = "call ADDFACULTYDEPSAL ...

在这里查看: MySQL连接器指南 我还尝试将stmt更改为可调用语句，例如:

looking here: MySQL Connector Guide I also tried changing stmt to a callable statement as such:

CallableStatement stmt;
if(a == 1){
    stmt = dbConnection.prepareCall("{call ADDFACULTYDEPTSAL(?,?,?)}");
} else {
    stmt = dbConnection.prepareCall("{call ADDFACULTYUNISAL(?,?,?)}");
}

但是，尝试这种方法似乎不起作用，因为我需要向过程中传递两个以上的变量.

However, trying this way doesn't seem to work because I need to pass more than two variables into the procedure.

有人可以告诉我我在做什么错吗?

Can anyone tell me what I'm doing wrong?

推荐答案

您快到了:

String call = (a == 1 ? "{call ADDFACULTYDEPTSAL(?,?,?)}"
                      : "{call ADDFACULTYUNISAL(?,?,?)}");
try (CallableStatement stmt = dbConnection.prepareCall(call)) {
    stmt.setInt(1, Integer.parseInt(fid.getText()));
    stmt.setString(2, fname.getText());
    stmt.setInt(3, Integer.parseInt(did.getText()));
    stmt.execute();
}

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