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C return multiple values getter setter queries the database and adds the list return value to the window
2022-07-02 02:13:00 【weixin_ forty million nine hundred and thirty-eight thousand th】
Reference article C# Medium setter and getter
C# Medium setter and getter
How to use it? return Returns two or more values ?
Create a storage data object suoyou
class suoyou {
//private string utime;
// private string uin;
//private int flag;
// //private string unum;
// private string qnum;
// private string qtime;
// private string qname;
public string qname
{
get;
set;
}
public string qtime
{
get;
set;
}
public string qnum
{
get;
set;
}
public string unum
{
get;
set;
}
public string utime {
get;
set;
}
public string uin {
get;
set;
}
public int flag {
get;
set;
}
}
Create query object cha
class cha {
public List<suoyou> chasuoyou(string wenpath){
string qunp;
db b = new db();
List<suoyou> s=new List<suoyou>();
// Create connection string
string path = wenpath;
//string databaseFileName = "C:/QQ.db";
//string connectionString = "data source = " + databaseFileName;
// Linked database
//SQLiteConnection dbConnection = new SQLiteConnection(connectionString);
// Open database
//dbConnection.Open();
//sql sentence
string sql = "select name from sqlite_master where type='table' order by name;";
// load sql
SQLiteCommand cd = new SQLiteCommand(sql, b.lian(path));
// perform
SQLiteDataReader dr = cd.ExecuteReader();
//
// Query all table names
while (dr.Read())// Read
{
try
{
//Console.Write(dr["name"]+"\n");
string str = dr["name"].ToString();
if (str.Length > 12)// Filter less than 9 Table name of , Because the table names of user messages and group messages are greater than 9
{
qunp = str.Substring(0, 12);
string pan = str.Substring(0, 9);
//Console.Write(pan + "\n" + " I am a ");
if (pan == "tb_c2cMsg")
{
// Determine whether it is a user message or a group message
string pp = str;
//string str1 = dr["name"].ToString();
//string pan1 = str1.Substring(0, 9);
//Console.Write(str + "\n");
string sqls = "select * from '" + str + "';";
// load sql
SQLiteCommand cds = new SQLiteCommand(sqls, b.lian(path));
// perform
SQLiteDataReader drs = cds.ExecuteReader();
if (drs.Read())// Read
{
string count;
string sqlc = "select count(*) as num from '" + str + "';";// Get the number of messages
// load sql
SQLiteCommand cdsc = new SQLiteCommand(sqlc, b.lian(path));
// perform
SQLiteDataReader drc = cdsc.ExecuteReader();
if (drc.Read())
{
count = drc["num"].ToString();
//Console.Write(count+"\n");
}
//Console.Write(drs["uin"]);
DateTime d = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));// Turn the timestamp to mm / DD / yyyy
long t = long.Parse(drs["time"] + "0000000");
TimeSpan to = new TimeSpan(t);
//Console.Write(d.Add(to) + "\n");
var time6 = d.Add(to);
suoyou y = new suoyou();
y.uin = drs["uin"].ToString();
y.utime = time6.ToString();
y.unum = drc["num"].ToString();
s.Add(y);
ListViewItem lt = new ListViewItem();
// Convert database data into ListView A row of data of type
}
}
else if (qunp == "tb_TroopMsg_" && str.Length > 16)// The filter table name starts with troopm But less than 12 Characters , Because this is not a table with content
{
// It's a group message
//if (str.Length > 16 && qunp == "tb_TroopMsg_")
//{
string qun;
try
{
Console.Write(str + ".." + str.Length + "\n");
//string pan1 = str.Substring(9, 12);
qun = str.Substring(12);
Console.Write(qun + "\n");
}
catch (Exception e2)
{
Console.Write(e2 + " Group Fault ");
}
//}
string pp = str.Substring(0, 12);
if (pp == "tb_TroopMsg_" && str.Length > 12)
{
//string pan1 = str.Substring(0, str.Length);
//Console.Write(pan1 + "\n"+str.Length+"\n");
//string qun = str.Substring(4, str.Length);
//Console.Write(str+"\n");
string sqls = "select * from '" + str + "';";
// load sql
SQLiteCommand cds = new SQLiteCommand(sqls, b.lian(path));
// perform
SQLiteDataReader drs = cds.ExecuteReader();
if (drs.Read())// Read
{
string count;
string sqlc = "select count(*) as num from '" + str + "';";// Get the number of messages
// load sql
SQLiteCommand cdsc = new SQLiteCommand(sqlc, b.lian(path));
// perform
SQLiteDataReader drc = cdsc.ExecuteReader();
if (drc.Read())
{
count = drc["num"].ToString();
//Console.Write(count+"\n");
}
//Console.Write(drs["uin"]);
DateTime d = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));// Turn the timestamp to mm / DD / yyyy
long t = long.Parse(drs["MsgTime"] + "0000000");
TimeSpan to = new TimeSpan(t);
//Console.Write(d.Add(to) + "\n");
var time6 = d.Add(to);
suoyou y = new suoyou();
y.qname = " Group " + str.Substring(12);
y.qtime = time6.ToString();
y.qnum = drc["num"].ToString();
}
}
//string str1 = dr["name"].ToString();
//string pan1 = str1.Substring(0, 9);
//Console.Write(str + "\n");
// pan1 = pp.Substring(0, pp.Length);
//Console.Write(pan1+"\n");
}
else
{
Console.Write(str + " Group mismatch ");
}
}
else
{
Console.Write(str + " User messages do not match ");
}
}
catch (Exception e1)
{
Console.Write(e1 + " The following error ");
}
}
return s;
}
}
cha in chasuoyou Method return value is list , Save the queried data into the object , Then put the object into list
Here is the extracted value
cha c = new cha();
List<suoyou> s=c.chasuoyou(wenpath);
for (int i = 0; i < s.Count;i++ )
{
ListViewItem lt = new ListViewItem();
lt.Text = s[i].uin;
lt.SubItems.Add(s[i].utime);
lt.SubItems.Add(s[i].unum);
// take lt Data added to listView1 Control
listView1.Items.Add(lt);
Console.Write(s[0].unum);
}
Here is the complete code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SQLite;
using System.IO;
namespace qq
{
public partial class Form1 : Form
{
class db
{
private SQLiteConnection dbConnection;
//private SQLiteCommand cd;
//private SQLiteDataReader read;
public SQLiteConnection lian(string path)
{
// Create connection string
try
{
string databaseFileName = path;
string connectionString = "data source = " + databaseFileName;
// Linked database
dbConnection = new SQLiteConnection(connectionString);
dbConnection.Open();
}
catch (Exception e)
{
Console.Write(e + " object ");
}
return dbConnection;
}
}
class suoyou {
//private string utime;
// private string uin;
//private int flag;
// //private string unum;
// private string qnum;
// private string qtime;
// private string qname;
public string qname
{
get;
set;
}
public string qtime
{
get;
set;
}
public string qnum
{
get;
set;
}
public string unum
{
get;
set;
}
public string utime {
get;
set;
}
public string uin {
get;
set;
}
public int flag {
get;
set;
}
}
class cha {
public List<suoyou> chasuoyou(string wenpath){
string qunp;
db b = new db();
List<suoyou> s=new List<suoyou>();
// Create connection string
string path = wenpath;
//string databaseFileName = "C:/QQ.db";
//string connectionString = "data source = " + databaseFileName;
// Linked database
//SQLiteConnection dbConnection = new SQLiteConnection(connectionString);
// Open database
//dbConnection.Open();
//sql sentence
string sql = "select name from sqlite_master where type='table' order by name;";
// load sql
SQLiteCommand cd = new SQLiteCommand(sql, b.lian(path));
// perform
SQLiteDataReader dr = cd.ExecuteReader();
//
// Query all table names
while (dr.Read())// Read
{
try
{
//Console.Write(dr["name"]+"\n");
string str = dr["name"].ToString();
if (str.Length > 12)// Filter less than 9 Table name of , Because the table names of user messages and group messages are greater than 9
{
qunp = str.Substring(0, 12);
string pan = str.Substring(0, 9);
//Console.Write(pan + "\n" + " I am a ");
if (pan == "tb_c2cMsg")
{
// Determine whether it is a user message or a group message
string pp = str;
//string str1 = dr["name"].ToString();
//string pan1 = str1.Substring(0, 9);
//Console.Write(str + "\n");
string sqls = "select * from '" + str + "';";
// load sql
SQLiteCommand cds = new SQLiteCommand(sqls, b.lian(path));
// perform
SQLiteDataReader drs = cds.ExecuteReader();
if (drs.Read())// Read
{
string count;
string sqlc = "select count(*) as num from '" + str + "';";// Get the number of messages
// load sql
SQLiteCommand cdsc = new SQLiteCommand(sqlc, b.lian(path));
// perform
SQLiteDataReader drc = cdsc.ExecuteReader();
if (drc.Read())
{
count = drc["num"].ToString();
//Console.Write(count+"\n");
}
//Console.Write(drs["uin"]);
DateTime d = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));// Turn the timestamp to mm / DD / yyyy
long t = long.Parse(drs["time"] + "0000000");
TimeSpan to = new TimeSpan(t);
//Console.Write(d.Add(to) + "\n");
var time6 = d.Add(to);
suoyou y = new suoyou();
y.uin = drs["uin"].ToString();
y.utime = time6.ToString();
y.unum = drc["num"].ToString();
s.Add(y);
ListViewItem lt = new ListViewItem();
// Convert database data into ListView A row of data of type
}
}
else if (qunp == "tb_TroopMsg_" && str.Length > 16)// The filter table name starts with troopm But less than 12 Characters , Because this is not a table with content
{
// It's a group message
//if (str.Length > 16 && qunp == "tb_TroopMsg_")
//{
string qun;
try
{
Console.Write(str + ".." + str.Length + "\n");
//string pan1 = str.Substring(9, 12);
qun = str.Substring(12);
Console.Write(qun + "\n");
}
catch (Exception e2)
{
Console.Write(e2 + " Group Fault ");
}
//}
string pp = str.Substring(0, 12);
if (pp == "tb_TroopMsg_" && str.Length > 12)
{
//string pan1 = str.Substring(0, str.Length);
//Console.Write(pan1 + "\n"+str.Length+"\n");
//string qun = str.Substring(4, str.Length);
//Console.Write(str+"\n");
string sqls = "select * from '" + str + "';";
// load sql
SQLiteCommand cds = new SQLiteCommand(sqls, b.lian(path));
// perform
SQLiteDataReader drs = cds.ExecuteReader();
if (drs.Read())// Read
{
string count;
string sqlc = "select count(*) as num from '" + str + "';";// Get the number of messages
// load sql
SQLiteCommand cdsc = new SQLiteCommand(sqlc, b.lian(path));
// perform
SQLiteDataReader drc = cdsc.ExecuteReader();
if (drc.Read())
{
count = drc["num"].ToString();
//Console.Write(count+"\n");
}
//Console.Write(drs["uin"]);
DateTime d = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));// Turn the timestamp to mm / DD / yyyy
long t = long.Parse(drs["MsgTime"] + "0000000");
TimeSpan to = new TimeSpan(t);
//Console.Write(d.Add(to) + "\n");
var time6 = d.Add(to);
suoyou y = new suoyou();
y.qname = " Group " + str.Substring(12);
y.qtime = time6.ToString();
y.qnum = drc["num"].ToString();
}
}
//string str1 = dr["name"].ToString();
//string pan1 = str1.Substring(0, 9);
//Console.Write(str + "\n");
// pan1 = pp.Substring(0, pp.Length);
//Console.Write(pan1+"\n");
}
else
{
Console.Write(str + " Group mismatch ");
}
}
else
{
Console.Write(str + " User messages do not match ");
}
}
catch (Exception e1)
{
Console.Write(e1 + " The following error ");
}
}
return s;
}
}
public Form1()
{
InitializeComponent();
}
string wenpath;
private void Form1_Load(object sender, EventArgs e)
{
}
private void button2_Click(object sender, EventArgs e)
{
OpenFileDialog P_File_Folder = new OpenFileDialog();
P_File_Folder.Multiselect = true;// This value determines whether multiple files can be selected
P_File_Folder.Title = " Please select a folder ";
P_File_Folder.Filter = "QQ.db(QQ.db)|QQ.db";
if (P_File_Folder.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
string file = P_File_Folder.FileName;
wenpath = file;
Console.Write(file);
}
}
private void button3_Click(object sender, EventArgs e)
{
// Find data Show all tables
if (wenpath != null && wenpath != "")
{
cha c = new cha();
List<suoyou> s=c.chasuoyou(wenpath);
for (int i = 0; i < s.Count;i++ )
{
ListViewItem lt = new ListViewItem();
lt.Text = s[i].uin;
lt.SubItems.Add(s[i].utime);
lt.SubItems.Add(s[i].unum);
// take lt Data added to listView1 Control
listView1.Items.Add(lt);
Console.Write(s[0].unum);
}
}
else
{
MessageBox.Show(" I haven't chosen the corresponding QQ.db file ");
}
}
}
}
/* // Create connection string db b = new db(); // Create connection string string path = "C:/QQ.db"; //string s = "tb_c2cMsg_1030031037"; //sql sentence string s = "tb_c2cMsg_1030331506"; string count; int c; string sqlc = "select count(*) as num from '" + s + "';";// Get the number of messages // load sql SQLiteCommand cdsc = new SQLiteCommand(sqlc, b.lian(path)); // perform SQLiteDataReader drc = cdsc.ExecuteReader(); if (drc.Read()) { c = drc.GetInt32(drc.GetOrdinal("num")); count = drc["num"].ToString(); Console.Write(count+"\n"+c); if (c != 0) { string ui3 = "p"; FileStream stream = File.Create("c:\\jl\\" + ui3 + ".txt"); // FileStream fs1 = new FileStream("c:\\jl\\'" + uin3 + "'.txt", FileMode.Create, FileAccess.Write);// Create write file // Set the file property to hidden // System.IO.File.SetAttributes(@"c:\\users\\cc\\desktop\\jl\\'" + uin + "'.txt", FileAttributes.Hidden); StreamWriter sw = new StreamWriter(stream); string sql = "select * from '" + s + "'"; // load sql SQLiteCommand cd = new SQLiteCommand(sql, b.lian(path)); // perform SQLiteDataReader dr = cd.ExecuteReader(); while (dr.Read())// Read { DateTime d = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));// Turn the timestamp to mm / DD / yyyy long t = long.Parse(dr["time"] + "0000000"); TimeSpan to = new TimeSpan(t); Console.Write(d.Add(to) + "\n"); var time6 = d.Add(to); string uin = dr["uin"].ToString(); int panduan = dr.GetInt32(dr.GetOrdinal("flag")); //Console.Write(panduan); if (panduan == 1) { Console.Write(" other party -----"+time6); } else { Console.Write(" I -------"+time6); } //var tempStr =dr["time"]; var p = dr["content"]; // Get plain text with getstring Get serial number with getordinal For getting numbers getint32 Console.Write(p + "\n"); string uin3 = "0"; if (panduan == 1) { Console.Write(" other party "); sw.WriteLine(" other party --------" +time6+ "\n"+"_____________________________"+"");// Start writing values } else { Console.Write(" I "); sw.WriteLine(" I -------"+time6 + "\n");// Start writing values } sw.WriteLine(p + "\n");// Start writing values } sw.Close(); stream.Close(); } else { Console.Write(" Table empty "); } } */
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