如何在 JDBC 中调用存储过程

Question

对于家庭作业，我必须创建一个 pl/sql 存储过程来将一个 facutly 成员添加到数据库中

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;

完成后，我需要为所述过程进行 java 调用，我已经厌倦了：

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);

我在一个不断抛出错误的 try catch 块中有上述内容。根据我在其他网站上看到的内容，我尝试了字符串“in”的几种变体： in = "{调用 ADDFACULTYDEPSAL ... in = "调用 ADDFACULTYDEPSAL ...

看这里：MySQL Connector Guide 我还尝试将 stmt 更改为这样的可调用语句：

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

但是，尝试这种方式似乎不起作用，因为我需要将两个以上的变量传递到过程中。

谁能告诉我我做错了什么？

Answer 1

你快到了：

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();
}