WinForm] [Miscellany (2): C # SQLite database operations (summary)

Operation list of features:

Function 1: Read all table / index / view
Function 2: to read table data

Function 1: Read all table / index / view

Each SQLite database has called sqlit_master table, which stores a data structure of the database (table structure, view of the structure, the index structure). Therefore, by reading sqlit_master it will be able to obtain all the information table.

Gets the table name

SELECT name FROM sqlite_master WHERE TYPE='table' ORDER BY name

Gets the index

SELECT name FROM sqlite_master WHERE TYPE='index' ORDER BY name

Get View

SELECT name FROM sqlite_master WHERE TYPE='view' ORDER BY name

To get the table name, for example, the complete code

 1 public DataSet GetTableNames(string path) {
 2     string strSQL = "SELECT name FROM sqlite_master WHERE TYPE='table' ORDER BY name";
 3     DataSet ds = null;
 4     try {
 5         SQLiteConnection conn = new SQLiteConnection(path);
 6         SQLiteCommand cmd = new SQLiteCommand(strSQL, conn);
 7         SQLiteDataAdapter reciever = new SQLiteDataAdapter(cmd);
 8         ds = new DataSet();
 9         reciever.Fill(ds);
10         return ds;
11     } catch {
12         MessageBox.Show("There is no data table");
13     }
14     return ds;
15 }
16 DataSet dbnames = GetTableNames(DBPath);

Note that at this time is returned ds element contains a number only, all the table names in column vector form is stored in a table (i.e. ds only element).

Reading the table of code number

int tablecount = dbnames.Tables[0].Rows.Count;

Read the index for the X table name

string tablename = dbnames.Table[0].Rows[X].ItemArray[0].ToString();//X starts from 0

Function 2: to read table data

 1 public DataTable GetDataTable(string strSQL, string path){
 2     DataTable dt = null;
 3     try {
 4         SQLiteConnection conn = new SQLiteConnection(path);
 5         SQLiteCommand cmd = new SQLiteCommand(strSQL,conn);
 6         SQLiteDataAdapter reciever = new SQLiteDataAdapter(cmd);
 7         dt = new DataTable();
 8         reciever.Fill(dt);
 9         return dt;
10     } catch{
11         MessageBox.Show("There is no such a datatable");
12     }
13     return dt;
14 }

Wherein strSQL is acquired instruction data in the file table db

string sSQL = "SELECT * FROM item_compound;";

Here the data table called " item_compound ."

Road Path to file

public static string DBPath = string.Format(@"Data Source={0}",
                    Application.StartupPath + @"\CCUS_supstr_temp.db");//the path of .db file

Here db file named " CCUS_supstr_temp.db ."

WinForm] [Miscellany (2): C # SQLite database operations (summary)

Guess you like