将 JSON 文件中的数据插入 MySql 表答案

【问题标题】：Insert data from JSON file to MySql Table将 JSON 文件中的数据插入 MySql 表
【发布时间】：2019-09-12 07:34:47
【问题描述】：

我正在尝试将数据插入 MySQL 数据库表。我已经创建了这样的表：

mysql> SHOW COLUMNS FROM sampledata;
+------------------+---------------+------+-----+---------+-------+
| Field            | Type          | Null | Key | Default | Extra |
+------------------+---------------+------+-----+---------+-------+
| Confidence       | bigint(20)    | YES  |     | NULL    |       |
| ConnectionId     | bigint(20)    | YES  |     | NULL    |       |
| Imei             | bigint(20)    | YES  |     | NULL    |       |
| Imsi             | bigint(20)    | YES  |     | NULL    |       |
| IsData           | varchar(10)   | YES  |     | NULL    |       |
| IsSignalling     | varchar(10)   | YES  |     | NULL    |       |
| IsVoice          | varchar(10)   | YES  |     | NULL    |       |
| Latitude         | double(20,20) | YES  |     | NULL    |       |
| Longitude        | double(20,20) | YES  |     | NULL    |       |
| Mcc              | int(11)       | YES  |     | NULL    |       |
| Mnc              | int(11)       | YES  |     | NULL    |       |
| SegmentDuration  | time          | YES  |     | NULL    |       |
| SegmentStartTime | datetime      | YES  |     | NULL    |       |
| ServingCellLabel | varchar(20)   | YES  |     | NULL    |       |
| Sv               | int(11)       | YES  |     | NULL    |       |
| TrackingAreaCode | int(11)       | YES  |     | NULL    |       |
| Uncertainity     | int(11)       | YES  |     | NULL    |       |
+------------------+---------------+------+-----+---------+-------+
17 rows in set (0.00 sec)

我试过下面的代码

package mysql;

import java.sql.Connection;

import java.sql.DriverManager;
import java.sql.PreparedStatement;

import javax.tools.JavaFileObject;

import jdk.nashorn.internal.parser.JSONParser;

public class sampleData {
    public int insertJSONtoDB() throws Exception {
    int status = 0;
    try {
        Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "user", "user123");
            PreparedStatement preparedStatement = con.prepareStatement("insert into  sampledata values ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? )");
            JSONParser parser = new JSONParser();
            Object obj = parser.parse(new FileReader("/home/Desktop/PD/sampledata.json")); 
            JavaFileObject jsonObject = (JSONObject) obj;

            String id = (String) jsonObject.get("Confidence"); // from JSON tag
            preparedStatement.setString(1, Confidence); // to the Database table

            String name = (String) itemize.get("ConnectionId");
            preparedStatement.setString(2, ConnectionId);

            status = preparedStatement.executeUpdate();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (con != null) {
                    con.close();
                }

            } catch (Exception e1) {
                e1.printStackTrace();
            }
        }
        return status;
    }
}

但它不起作用。此外，当我尝试导入任何 SQL 或 JSON 包时，它会显示错误。我尝试在 Eclipse 中设置构建路径，但无济于事。谁能告诉我我做错了什么。下面是我的 JSON 文件中的 sn-p。

{
        "Confidence": "1.994667E-07", 
        "Uncertainty": "178", 
        "IsData": "FALSE", 
        "Latitude": "1.694202", 
        "ConnectionId": "330708186825281", 
        "Mcc": "999", 
        "Sv": "01", 
        "Longitude": "0.434623", 
        "IsVoice": "FALSE", 
        "IsSignalling": "TRUE", 
        "SegmentStartTime": "16/02/2017 09:56:59.912", 
        "Imei": "99999006686069", 
        "SegmentDuration": "00:00:00.0350000", 
        "Mnc": "99", 
        "ServingCellLabel": "Cell18", 
        "Imsi": "999992223223602", 
        "TrackingAreaCode": "1234"
    }, 
    {
        "Confidence": "1.504506E-12", 
        "Uncertainty": "314", 
        "IsData": "FALSE", 
        "Latitude": "1.633704", 
        "ConnectionId": "260339442647675", 
        "Mcc": "999", 
        "Sv": "02", 
        "Longitude": "0.668554", 
        "IsVoice": "FALSE", 
        "IsSignalling": "TRUE", 
        "SegmentStartTime": "16/02/2017 09:57:01.377", 
        "Imei": "99999207564306", 
        "SegmentDuration": "00:00:00.0280000", 
        "Mnc": "99", 
        "ServingCellLabel": "Cell19", 
        "Imsi": "999993793410366", 
        "TrackingAreaCode": "1235"
    }, 
    {
        "Confidence": "0.3303348", 
        "Uncertainty": "129", 
        "IsData": "FALSE", 
        "Latitude": "1.847635", 
        "ConnectionId": "260339442647676", 
        "Mcc": "999", 
        "Sv": "14", 
        "Longitude": "1.356349", 
        "IsVoice": "FALSE", 
        "IsSignalling": "TRUE", 
        "SegmentStartTime": "16/02/2017 09:57:01.555", 
        "Imei": "99999605176135", 
        "SegmentDuration": "00:00:00.0290000", 
        "Mnc": "99", 
        "ServingCellLabel": "Cell13", 
        "Imsi": "999992216631694", 
        "TrackingAreaCode": "1236"
    }, 
    {
        "Confidence": "0.01800376", 
        "Uncertainty": "463", 
        "IsData": "FALSE", 
        "Latitude": "1.914598", 
        "ConnectionId": "330708186825331", 
        "Mcc": "999", 
        "Sv": "74", 
        "Longitude": "1.222736", 
        "IsVoice": "FALSE", 
        "IsSignalling": "TRUE", 
        "SegmentStartTime": "16/02/2017 09:57:02.689", 
        "Imei": "99999007880884", 
        "SegmentDuration": "00:00:00.0260000", 
        "Mnc": "99", 
        "ServingCellLabel": "Cell7", 
        "Imsi": "999992226681236", 
        "TrackingAreaCode": "1237"
    }

【问题讨论】：

“它不工作”是什么意思？错误？数据错误？没有数据？永远不要说“显示错误”。包括错误。他们不只是为了好玩，他们解释了问题所在。
您的 JSON 文件似乎是一个数组（尽管括号中没有显示 snipplet），所以您应该这样对待它并遍历它的元素。
@SamiKuhmonen 当我尝试运行该文件时，出现构建错误，例如包导入未完成。
@MauricePerry 是的，它是一个数组，sn-p 位于中间位置。

标签： java mysql json jdbc

【解决方案1】：

您似乎在文件中有数据数组，因此您应该创建一个模型对象来读取。使用 Google 提供的免费 gson 库喜欢

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.moieen.stack.overflow.question;

import java.util.List;

/**
 *
 * @author moieen.abbas
 */
public class MyDataVO {

    private List<Data> list_data;

    public List<Data> getData() {
        return list_data;
    }

    public void setData(List<Data> list_data) {
        this.list_data = list_data;
    }

}
class Data{
    private String Confidence;
    private String Uncertainty;
    private String IsData;
    private String Latitude;
    private String ConnectionId;
    private String Mcc;
    private String Sv;
    private String Longitude;
    private String IsVoice;
    private String IsSignalling;
    private String SegmentStartTime;
    private String Imei;
    private String SegmentDuration;
    private String Mnc;
    private String ServingCellLabel;
    private String Imsi;
    private String TrackingAreaCode;

    public String getConfidence() {
        return Confidence;
    }

    public void setConfidence(String Confidence) {
        this.Confidence = Confidence;
    }

    public String getUncertainty() {
        return Uncertainty;
    }

    public void setUncertainty(String Uncertainty) {
        this.Uncertainty = Uncertainty;
    }

    public String getIsData() {
        return IsData;
    }

    public void setIsData(String IsData) {
        this.IsData = IsData;
    }

    public String getLatitude() {
        return Latitude;
    }

    public void setLatitude(String Latitude) {
        this.Latitude = Latitude;
    }

    public String getConnectionId() {
        return ConnectionId;
    }

    public void setConnectionId(String ConnectionId) {
        this.ConnectionId = ConnectionId;
    }

    public String getMcc() {
        return Mcc;
    }

    public void setMcc(String Mcc) {
        this.Mcc = Mcc;
    }

    public String getSv() {
        return Sv;
    }

    public void setSv(String Sv) {
        this.Sv = Sv;
    }

    public String getLongitude() {
        return Longitude;
    }

    public void setLongitude(String Longitude) {
        this.Longitude = Longitude;
    }

    public String getIsVoice() {
        return IsVoice;
    }

    public void setIsVoice(String IsVoice) {
        this.IsVoice = IsVoice;
    }

    public String getIsSignalling() {
        return IsSignalling;
    }

    public void setIsSignalling(String IsSignalling) {
        this.IsSignalling = IsSignalling;
    }

    public String getSegmentStartTime() {
        return SegmentStartTime;
    }

    public void setSegmentStartTime(String SegmentStartTime) {
        this.SegmentStartTime = SegmentStartTime;
    }

    public String getImei() {
        return Imei;
    }

    public void setImei(String Imei) {
        this.Imei = Imei;
    }

    public String getSegmentDuration() {
        return SegmentDuration;
    }

    public void setSegmentDuration(String SegmentDuration) {
        this.SegmentDuration = SegmentDuration;
    }

    public String getMnc() {
        return Mnc;
    }

    public void setMnc(String Mnc) {
        this.Mnc = Mnc;
    }

    public String getServingCellLabel() {
        return ServingCellLabel;
    }

    public void setServingCellLabel(String ServingCellLabel) {
        this.ServingCellLabel = ServingCellLabel;
    }

    public String getImsi() {
        return Imsi;
    }

    public void setImsi(String Imsi) {
        this.Imsi = Imsi;
    }

    public String getTrackingAreaCode() {
        return TrackingAreaCode;
    }

    public void setTrackingAreaCode(String TrackingAreaCode) {
        this.TrackingAreaCode = TrackingAreaCode;
    }

}
public class sampleData {
    public static void main(String[] args) throws IOException {
          String contents = new String(Files.readAllBytes(Paths.get("/home/Desktop/PD/sampledata.json")));

            //Use Google GSON Library 
            Gson obj_gson = new Gson();
            MyDataVO obj_dataVo= obj_gson.fromJson(contents, MyDataVO.class);

            Data obj_data=obj_dataVo.getData().get(0);
            //Get all data from obj_data.
             System.out.println(obj_data.getConfidence());
    }
}

【讨论】：

我怎样才能将数据发送到我的数据库？之后有点失落。
运行时出现以下错误：预期为 BEGIN_OBJECT 但在第 1 行第 2 列路径为 BEGIN_ARRAY
json文件为数组形式：[ { "Confidence": "1.994667E-07", "Uncertainty": "178", "IsData": "FALSE", "Latitude" ：“1.694202”，“ConnectionId”：“330708186825281”，“Mcc”：“999”，“Sv”：“01”，“经度”：“0.434623”，}]
如果文件中有 JSON 数据数组，则仅使用 Data 类获取值，例如 public static void main(String[] args) throws IOException { String contents = new String(Files.readAllBytes(Paths.get("C:\\Users\\moieen.abbas\\Desktop\\json.txt"))); //Use Google GSON Library Gson obj_gson = new Gson(); Data[] obj_data= obj_gson.fromJson(contents, Data[].class); Data obj_data=obj_data[0]; //Get all data from obj_data. System.out.println(obj_data.getConfidence()); }