我在sqlite中创建了一个包含两个表的数据库。 我有一个非常具体的CSV文件，我必须在数据库中插入。 表＆＃39; hyddnev＆＃39;我需要在列中插入＆＃39; Station＆＃39;（站点数是文件中每行的第一个元素）和＆＃39; Dat＆＃39; （年份是文件中的每一行的第二个元素，mounth的日期是文件中每行的第三个元素 - 第一行是第1天，第二行是第2天到第31天）。几天之后，我有12列，其中包含1月到12月的mounths值。我需要在Hydnev表中的Station列中插入№的站点，在同一个表中的列Dat中插入日期，并在每行的12列中插入1月到12月的值。 现在我尝试插入№的电台和日期，但我有例外：
Constraint failed
NOT NULL constraint failed: hyddnev.Dat
Constraint failed
NOT NULL constraint failed: hyddnev.Station
CSV文件包含1976年至2015年的年份，每年有31行..
18050,1976,1,0.390,0.660,0.290,0.740,9.160,1.400,0.670,3.120,0.460,0.420,0.360,0.400,
18050,1976,2,0.390,0.520,0.290,0.740,7.540,1.270,0.670,2.660,0.460,0.420,0.360,0.380,
18050,1976,3,0.390,0.450,0.240,0.660,5.260,1.270,0.670,2.510,0.460,0.420,0.410,0.400,
18050,1976,4,0.390,0.450,0.240,0.660,4.400,1.180,0.620,2.360,0.460,0.410,0.400,0.440,
18050,1976,5,0.390,0.450,0.290,0.660,4.220,1.080,0.620,2.360,0.460,0.410,0.400,4.750,
18050,1976,6,0.520,0.390,0.240,0.580,4.040,1.270,0.620,4.200,0.460,0.410,0.380,2.810,
18050,1976,7,0.390,0.390,0.240,0.520,3.680,37.800,0.620,5.870,0.460,0.400,0.360,1.620,
18050,1976,8,0.390,0.390,0.200,0.580,3.330,22.900,0.580,4.570,0.460,0.380,0.360,0.980,
18050,1976,9,0.390,0.390,0.200,0.660,2.830,11.200,0.580,4.020,0.460,0.360,0.360,0.740,
18050,1976,10,0.390,0.340,0.200,1.380,2.650,8.120,0.580,3.660,0.440,0.360,0.360,0.520,
18050,1976,11,0.340,0.390,0.200,2.260,2.350,5.870,0.580,3.270,0.440,0.360,0.360,0.460,
18050,1976,12,0.340,0.450,0.200,1.700,2.350,4.750,0.580,4.570,0.440,0.360,0.360,0.460,
18050,1976,13,0.340,0.390,0.200,1.590,2.350,3.840,0.540,4.020,0.440,0.340,0.360,0.440,
18050,1976,14,0.340,0.390,0.290,2.120,2.200,3.120,0.540,3.660,0.420,0.340,0.340,0.520,
18050,1976,15,0.290,0.390,0.290,2.400,2.050,2.970,0.540,3.270,0.420,0.400,0.340,0.520,
18050,1976,16,0.290,0.390,0.240,1.590,1.770,2.810,0.540,2.970,0.420,0.360,0.340,0.440,
18050,1976,17,0.290,0.340,0.290,1.170,1.520,2.660,0.540,2.660,0.410,0.360,0.330,0.420,
18050,1976,18,0.290,0.340,0.290,1.170,1.270,2.360,0.540,2.210,0.410,0.410,0.340,0.420,
18050,1976,19,0.240,0.340,0.390,1.170,1.080,2.210,0.540,2.060,0.410,0.410,0.400,0.410,
18050,1976,20,0.290,0.340,0.390,1.010,1.080,2.060,0.520,1.760,0.400,0.400,1.340,0.400,
18050,1976,21,0.290,0.290,0.390,0.920,1.270,1.760,0.520,1.200,0.740,0.400,2.660,0.400,
18050,1976,22,0.340,0.290,0.450,0.820,2.860,1.480,0.520,1.080,0.580,0.380,1.760,0.400,
18050,1976,23,0.340,0.290,0.520,0.740,3.050,1.200,0.520,0.980,0.580,0.380,0.980,0.400,
18050,1976,24,0.340,0.290,0.520,0.660,4.000,0.980,0.540,0.810,0.540,0.380,0.520,0.380,
18050,1976,25,0.340,0.290,0.920,0.740,2.680,0.890,2.810,0.670,0.520,0.360,0.460,0.380,
18050,1976,26,0.390,0.290,1.380,1.380,2.060,0.810,2.510,0.580,0.520,0.360,0.440,0.380,
18050,1976,27,0.740,0.290,1.490,2.570,1.770,0.810,2.510,0.580,0.490,0.360,0.420,0.380,
18050,1976,28,1.280,0.290,1.380,2.730,1.770,0.740,4.750,0.520,0.460,0.360,0.410,0.360,
18050,1976,29,1.010,0.290,1.090,3.610,1.650,0.740,5.480,0.520,0.420,0.360,0.410,0.360,
18050,1976,30,0.820,,0.820,4.000,1.520,0.670,4.210,0.490,0.420,0.360,0.400,0.360,
18050,1976,31,0.660,,0.740,,1.520,,3.660,0.460,,0.360,,0.440,
我不知道如何插入表格，我需要在我用它来绘制带有选择查询的图形后插入。
我的代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SQLite;
namespace WindowsFormsApp1
{
public partial class Form1 : Form
{
private SQLiteConnection Connection;
public Form1()
{
InitializeComponent();
label3.Hide();
label4.Hide();
SQLiteConnection.CreateFile("hydrodb.sqlite");
SQLiteConnection Connection = new SQLiteConnection("Data Source=hydrodb.sqlite;Version=3;");
Connection.Open();
string createTable = ("CREATE TABLE hyddnev (Station UNSIGNED INT(5) NOT NULL, Dat datetime NOT NULL, Stoej int(5) DEFAULT NULL, Vkol UNSIGNED FLOAT(7,3) DEFAULT NULL, PRIMARY KEY (Station, Dat))");
SQLiteCommand createHydDnev = new SQLiteCommand(createTable, Connection);
createHydDnev.ExecuteNonQuery();
string createTable2 = ("CREATE TABLE hydmes (Station UNSIGNED INT(5) NOT NULL, Dat datetime NOT NULL, StoejMin smallint(5) DEFAULT NULL, VkolMin UNSIGNED FLOAT(7,3) DEFAULT NULL, StoejSre smallint(5) DEFAULT NULL, VkolSre UNSIGNED FLOAT(7,3) DEFAULT NULL, StoejMax smallint(5) DEFAULT NULL, VkolMax UNSIGNED FLOAT(7,3) DEFAULT NULL, PRIMARY KEY (Station, Dat))");
SQLiteCommand createHydMes = new SQLiteCommand(createTable2, Connection);
createHydMes.ExecuteNonQuery();
string deleteTable = ("DELETE FROM hyddnev");
SQLiteCommand deleteHydDnev = new SQLiteCommand(deleteTable, Connection);
deleteHydDnev.ExecuteNonQuery();
string deleteTable2 = ("DELETE FROM hydmes");
SQLiteCommand deleteHydMes = new SQLiteCommand(deleteTable2, Connection);
deleteHydMes.ExecuteNonQuery();
this.Connection = Connection;
}
string pathFolder;
string pathFolder2;
string resultStation;
string resultStation2;
List<string> resultYears = new List<string>();
List<string> resultYears2 = new List<string>();
private void button1_Click(object sender, EventArgs e)
{
using (OpenFileDialog dialog = new OpenFileDialog())
{
if (dialog.ShowDialog(this) == DialogResult.OK)
{
string sFileName = dialog.FileName;
pathFolder = sFileName;
label3.Text = pathFolder;
label3.Show();
string[] lines = System.IO.File.ReadAllLines(dialog.FileName);
int i = 0;
foreach (var line in lines)
{
var splittedValues = line.Split(',');
var firstWord = splittedValues[0];
var firstYear = splittedValues[1];
if (!resultYears.Contains(firstYear))
{
resultYears.Add(firstYear);
}
if (i == 0)
{
resultStation = firstWord;
}
else
{
if (resultStation != firstWord)
{
MessageBox.Show("Файла с дневни данни трябва да съдържа само една станция!");
return;
}
}
i++;
string addDat = ("INSERT INTO hyddnev (Dat) values ('" + resultYears + "')");
SQLiteCommand insertDat = new SQLiteCommand(addDat, Connection);
try
{
insertDat.ExecuteNonQuery();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
string addStation = ("INSERT INTO hyddnev (Station) values(" + firstWord + ")");
SQLiteCommand insertStation = new SQLiteCommand(addStation, Connection);
try
{
insertStation.ExecuteNonQuery();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
resultYears.Sort();
}
}
}
private void button2_Click(object sender, EventArgs e)
{
using (OpenFileDialog dialog = new OpenFileDialog())
{
if (dialog.ShowDialog(this) == DialogResult.OK)
{
string sFileName = dialog.FileName;
pathFolder2 = sFileName;
label4.Text = pathFolder2;
label4.Show();
string[] lines = System.IO.File.ReadAllLines(dialog.FileName);
int i = 0;
foreach (var line in lines)
{
var splittedValues = line.Split(',');
var firstWord = splittedValues[0];
var firstYear2 = splittedValues[1];
if (!resultYears2.Contains(firstYear2))
{
resultYears2.Add(firstYear2);
}
if (i == 0)
{
resultStation2 = firstWord;
}
else
{
if (resultStation2 != firstWord)
{
MessageBox.Show("Файла с месечни данни трябва съдържа само една станция!");
return;
}
}
i++;
}
resultYears2.Sort();
}
}
}
public void label3_Click(object sender, EventArgs e)
{
}
public void label4_Click(object sender, EventArgs e)
{
}
private void button3_Click(object sender, EventArgs e)
{
if (resultStation != resultStation2)
{
MessageBox.Show("Номера на станцията в единия файл не отговаря на номера на станцията в другият файл!" + Environment.NewLine + Environment.NewLine +
"ЗАБЕЛЕЖКА!" + Environment.NewLine + Environment.NewLine + "В двата файла, номера на станцията трябва да бъде един и същ!");
}
comboBox1.Items.Add(resultStation);
if (string.Join(", ", resultYears) == string.Join(", ", resultYears2))
//if (resultYears.Equals(resultYears2))
{
for (int i = 0; i < this.resultYears.Count; i++)
{
comboBox2.Items.Add(resultYears[i]);
}
}
else
{
MessageBox.Show("Годините от двата файла не съвпадат.");
}
}
}
}
答案 0 :(得分：0)
您的CSV文件是否包含标题行？
CSV文件中有哪些列？
如果CSV文件中有列标题，则可以直接将CSV文件加载到数据表中，然后只需查询该表即可。 See this: Loading CSV file in data table (then query/apply filters on data table to extract required data)
注意：注意＆＃34; HDR =是/否＆＃34;和＆＃34;数据源= CSV文件的路径＆＃34;在连接字符串中。
// using System.Data;
// using System.Data.OleDb;
// using System.Globalization;
// using System.IO;
static DataTable GetDataTableFromCsv(string path, bool isFirstRowHeader)
{
string header = isFirstRowHeader ? "Yes" : "No";
string pathOnly = Path.GetDirectoryName(path);
string fileName = Path.GetFileName(path);
string sql = @"SELECT * FROM [" + fileName + "]";
using(OleDbConnection connection = new OleDbConnection(
@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + pathOnly +
";Extended Properties=\"Text;HDR=" + header + "\""))
using(OleDbCommand command = new OleDbCommand(sql, connection))
using(OleDbDataAdapter adapter = new OleDbDataAdapter(command))
{
DataTable dataTable = new DataTable();
dataTable.Locale = CultureInfo.CurrentCulture;
adapter.Fill(dataTable);
return dataTable;
}
}