C # Use System. Data. SQLite to operate SQLite,

Source: Internet
Author: User

C # Use System. Data. SQLite to operate SQLite,

Use System. Data. SQLite: http://system.data.sqlite.org/index.html/doc/trunk/www/downloads.wiki

Add System. Data. SQLite. dll to the project reference;

Create and insert tables

  1. Static void Main (string [] args)
  2. {
  3. SQLiteConnection conn = null;
  4. String dbPath = "Data Source =" + Environment. CurrentDirectory + "/test. db ";
  5. Conn = new SQLiteConnection (dbPath); // create a database instance and specify the file location
  6. Conn. Open (); // Open the database. It is automatically created if the file does not exist.
  7. String SQL = "CREATE TABLE IF NOT EXISTS student (id integer, name varchar (20), sex varchar (2);"; // TABLE creation statement
  8. SQLiteCommand created createtable = new SQLiteCommand (SQL, conn );
  9. CmdCreateTable. ExecuteNonQuery (); // If the table does not exist, create a data table.
  10. SQLiteCommand cmdInsert = new SQLiteCommand (conn );
  11. CmdInsert. CommandText = "insert into student VALUES (1, 'red', 'male')"; // INSERT several pieces of data
  12. CmdInsert. ExecuteNonQuery ();
  13. CmdInsert. CommandText = "insert into student VALUES (2, 'lil', 'femal ')";
  14. CmdInsert. ExecuteNonQuery ();
  15. CmdInsert. CommandText = "insert into student VALUES (3, 'xiaoming ', 'male ')";
  16. CmdInsert. ExecuteNonQuery ();
  17. Conn. Close ();
  18. }

You can use SQLite Database Browser to view data:

: Http://sourceforge.net/projects/sqlitebrowser/

 

Table created successfully.

Of course, this method is not efficient for data insertion. If the data volume is large, use the following method:

  1. Static void Main (string [] args)
  2. {
  3. String dbPath = Environment. CurrentDirectory + "/test. db"; // specify the database path
  4. Using (SQLiteConnection conn = new SQLiteConnection ("Data Source =" + dbPath) // create a connection
  5. {
  6. Conn. Open (); // Open the connection
  7. Using (SQLiteTransaction tran = conn. BeginTransaction () // instantiate a transaction
  8. {
  9. For (int I = 0; I <100000; I ++)
  10. {
  11. SQLiteCommand cmd = new SQLiteCommand (conn); // instantiate an SQL command
  12. Cmd. Transaction = tran;
  13. Cmd. CommandText = "insert into student values (@ id, @ name, @ sex)"; // sets an SQL statement with a parameter
  14. Cmd. Parameters. AddRange (new [] {// Add Parameters
  15. New SQLiteParameter ("@ id", I ),
  16. New SQLiteParameter ("@ name", "Chinese "),
  17. New SQLiteParameter ("@ sex", "male ")
  18. });
  19. Cmd. ExecuteNonQuery (); // execute the query
  20. }
  21. Tran. Commit (); // submit
  22. }
  23. }
  24. }

 

It takes about 5 seconds to insert such 100,000 data records.

 

Read data:

 

  1. Static void Main (string [] args)
  2. {
  3. SQLiteConnection conn = null;
  4. String dbPath = "Data Source =" + Environment. CurrentDirectory + "/test. db ";
  5. Conn = new SQLiteConnection (dbPath); // create a database instance and specify the file location
  6. Conn. Open (); // Open the database. It is automatically created if the file does not exist.
  7. String SQL = "select * from student ";
  8. SQLiteCommand cmdQ = new SQLiteCommand (SQL, conn );
  9. SQLiteDataReader reader = cmdQ. ExecuteReader ();
  10. While (reader. Read ())
  11. {
  12. Console. WriteLine (reader. GetInt32 (0) + "" + reader. GetString (1) + "" + reader. GetString (2 ));
  13. }
  14. Conn. Close ();
  15. Console. ReadKey ();
  16. }

 

Data is read successfully.

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