PostgreSQL提示:您需要重写或转换表达式.列"state"的类型为status,但表达式的类型为字符变化

Question

我正在尝试使用java创建一个SQL语句.问题是我正在使用

 stmt.setString(9, ev.getState().status());

对于我试图插入类型为status的SQL列的变量

 CREATE TYPE STATUS AS ENUM ('APPROVED', 'CLOSED','STARTED', 'WAITING');

它给我一个例外

column "state" is of type status but expression is of type character varying
Hint: You will need to rewrite or cast the expression.

我犯了错误还是我真的需要在sql中转换值？如果是的话,在这种情况下如何投射？

完整声明:

     PreparedStatement stmt = conn.prepareStatement("INSERT INTO Event (EventNum, EventName, startHour, endHour, startMin, endMin, startDate, endDate, State, depName) VALUES (?, ?, ?, ?, ?, ?, ?::date, ?::date, ?, ?)");




     stmt.setInt(1, ev.getEventNum());
     stmt.setString(2, ev.getName());
     stmt.setInt(3, ev.getStartHour());
     stmt.setInt(4, ev.getEndHour());
     stmt.setInt(5, ev.getStartMinute());
     stmt.setInt(6, ev.getEndMinute());
     stmt.setString(7, ev.getStartYear() + "-" + ev.getStartMonth() + "-" + ev.getStartDate());
     stmt.setString(8, ev.getEndYear() + "-" + ev.getEndMonth() + "-" + ev.getEndDate());
     stmt.setString(9, ev.getState().status());
     stmt.setString(10, ev.getDepartment());



     stmt.executeUpdate();

Answer 1

您正在使用Prepared Statements - PostgreSQL从客户端获取信息,因此参数是varchar因为您正在使用setString方法.您应该通知Postgres,因此输入数据类型与显式强制转换不同.

PreparedStatement stmt = conn.prepareStatement(
  "INSERT INTO Event (EventNum, EventName, startHour, endHour, startMin, endMin, startDate, endDate, State, depName)
               VALUES (?, ?, ?, ?, ?, ?, ?::date, ?::date, ?::status, ?)");

所有数据都以文本形式传递(默认情况下) - 因此传递的值没有问题.PostgreSQL使用严格的类型系统-并没有明确的铸造不允许从铸造varchar到date,enum,int,...