不能使靜態參考非靜態方法getUnit_id（）從類型官

Question

我想從下面這段代碼插入值：

public int create(Officer officer) { 
    String sql = "insert into officer values(" + officer.getOfficer_id() + ", " + officer.getCollege_id() + ", " + Officer.getUnit_id() + ", " + officer.getRole_id() + ")"; 
    return template.update(sql); 
} 

Answer 1

這應該是一個編譯錯誤。 getUnit_id不是一個靜態方法，所以你需要使用一個Officer實例來調用它。

public int create(Officer officer) { String sql = "insert into officer values(" + officer.getOfficer_id() + ", " + officer.getCollege_id() + ", " + officer.getUnit_id() + ", " + officer.getRole_id() + ")"; return template.update(sql); }