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我有一个程序可以查看用户模型并将值添加到准备好的更新语句中,如果它们不为空,如下所示

    PreparedStatement pst = conn.prepareStatement("UPDATE users SET name=?,email=?,pwd=?,avatar=?,sts=?,bio=?,country=? WHERE uuid=?");
    if(this.name != null) pst.setString(1, this.name);
    if(this.email != null) pst.setString(2, this.email);
    if(this.password != null) pst.setString(3, this.password);
    if(this.avatar != null) pst.setString(4, this.avatar);
    if(this.status != null) pst.setString(5, this.status);
    if(this.bio != null) pst.setString(6, this.bio);
    if(this.country != null) pst.setString(7, this.country);
    pst.setString(6, this.id);

我面临的问题是准备好的语句中不能有未定义的字段。我可以将不想更改的字段设置为等于什么?

4

1 回答 1

1

添加参数,即使带有NULL值。然后将其更改update为:

UPDATE users
    SET name = coalesce(?, name),
       email = coalesce(?, email),
       . . .
   WHERE uuid = ?;
于 2018-09-27T13:57:22.237 回答