Question

我有一份存储员工详细信息的文件。这是我的文档结构。

{
    "emp_id" : 1,
    "Employee_Name" : "Fareed Khan Jan",
    "Employee_Contact" : "07492897789",
    "Employee_Gender" : "Male",
    "Employee_Address" : "Lewisham",
    "IS_Available" : "YES",
    "Employee_Reports" : [ 
        {
     "Report_Title" : "Initial Project Design",
     "Report_Details" : "This is a sample report.",
     "Date_Submit" : "26/10/2015"
        }
    ],
    "Employee_Salary" : [ 
        {
            "month_year" : "Jan-2015",
            "actual_salary" : 200.0000000000000000,
            "bonus" : 0.0000000000000000,
            "penalty" : 0.0000000000000000,
            "bonus_pen_detail" : "NA",
            "total_amount_paid" : 200.0000000000000000
        }, 
        {
            "month_year" : "Feb-2015",
            "actual_salary" : 200.0000000000000000,
            "bonus" : 0.0000000000000000,
            "penalty" : 0.0000000000000000,
            "bonus_pen_detail" : "NA",
            "total_amount_paid" : 200.0000000000000000
        }
    ]
}

现在我想更新嵌入式文档'Employee_Salary'，其中“month-year”是'Feb-2015'。我编写了以下查询但它删除了'Employee_Salary'中的所有数据并更新了一个。我不想删除其中的其他数据。

db.employees.update
(
      { 'emp_id': 1, 'Employee_Salary.month_year' : "Feb-2015" }, 
      { '$set': { 
        'Employee_Salary': [
            {
            "month_year" : "Feb-2015",
            "actual_salary" : 200.0000000000000000,
            "bonus" : 80.0000000000000000,
            "penalty" : 0.0000000000000000,
            "bonus_pen_detail" : "NA",
            "total_amount_paid" : 280.0000000000000000 
            }
            ]
    }}
)

Answer 1

它是因为你用新数组告诉$set Employee_Salary。

要修改您在查找中查找的那个，您必须使用$运算符：

{ '$set': { 
        "Employee_Salary.$.bonus" : "80.0000000000000000"
}}

更新mongodb中的查询无法正常工作

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