C#操作SQLite方法实例详解_C# 读sqlite_gridview
首先下载DLL文件
using System.Data.SQLite;Connection和Command:
private SQLiteConnection conn;
private SQLiteCommand cmd;
连接db：
conn = new SQLiteConnection("Data Source=c:\\test.db");
conn.Open();
INSERT/UPDATE:
cmd = conn.CreateCommand();
cmd.CommandText = "INSERT INTO user(email,name) VALUES ('email','name')";
cmd.ExecuteNonQuery();
cmd.CommandText = "UPDATE userSET name = 'Codelicious' WHERE ID = 1";
cmd.ExecuteNonQuery();
SELECT:
cmd.CommandText = "SELECT ID, name FROM user";
SQLiteDataReader reader = cmd.ExecuteReader();
if (reader.HasRows)
{
while (reader.Read())
{
Console.WriteLine("ID: " + reader.GetInt16(0));
Console.WriteLine("name: " + reader.GetString(1));
}
}
模板程序：
using System;
using System.Data;
using System.Data.Common;
using System.Data.SQLite;
namespace SQLiteQueryBrowser
{
///
/// 说明：这是一个针对System.Data.SQLite的数据库常规操作封装的通用类。
///
public class SQLiteDBHelper
{
private string connectionString = string.Empty;
///
/// 构造函数
///
/// SQLite数据库文件路径
public SQLiteDBHelper(string dbPath)
{
this.connectionString = "Data Source=" + dbPath;
}
///
/// 创建SQLite数据库文件
///
/// 要创建的SQLite数据库文件路径
public static void CreateDB(string dbPath)
{
using (SQLiteConnection connection = new SQLiteConnection("Data Source=" + dbPath))
{
connection.Open();
using (SQLiteCommand command = new SQLiteCommand(connection))
{
command.CommandText = "CREATE TABLE Demo(id integer NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE)";
command.ExecuteNonQuery();
command.CommandText = "DROP TABLE Demo";
command.ExecuteNonQuery();
}
}
}
///
/// 对SQLite数据库执行增删改操作，返回受影响的行数。
///
/// 要执行的增删改的SQL语句
/// 执行增删改语句所需要的参数，参数必须以它们在SQL语句中的顺序为准
///
/// 执行一个查询语句，返回一个关联的SQLiteDataReader实例
///
/// 要执行的查询语句
/// 执行SQL查询语句所需要的参数，参数必须以它们在SQL语句中的顺序为准
///
/// 执行一个查询语句，返回一个包含查询结果的DataTable
///
/// 要执行的查询语句
/// 执行SQL查询语句所需要的参数，参数必须以它们在SQL语句中的顺序为准
///
/// 执行一个查询语句，返回查询结果的第一行第一列
///
/// 要执行的查询语句
/// 执行SQL查询语句所需要的参数，参数必须以它们在SQL语句中的顺序为准
///
/// 查询数据库中的所有数据类型信息
///
/// 完整的程序例子：
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.Common;
using System.Data.SQLite;
using SQLiteQueryBrowser;
namespace SQLiteDemo
{
class Program
{
static void Main(string[] args)
{
//CreateTable();
//InsertData();
ShowData();
Console.ReadLine();
}
public static void CreateTable()
{
string dbPath = "D:\\Demo.db3";
//如果不存在改数据库文件，则创建该数据库文件
if (!System.IO.File.Exists(dbPath))
{
SQLiteDBHelper.CreateDB("D:\\Demo.db3");
}
SQLiteDBHelper db = new SQLiteDBHelper("D:\\Demo.db3");
string sql = "CREATE TABLE Test3(id integer NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,Name char(3),TypeName varchar(50),addDate datetime,UpdateTime Date,Time time,Comments blob)";
db.ExecuteNonQuery(sql, null);
}
public static void InsertData()
{
string sql = "INSERT INTO Test3(Name,TypeName,addDate,UpdateTime,Time,Comments)values(@Name,@TypeName,@addDate,@UpdateTime,@Time,@Comments)";
SQLiteDBHelper db = new SQLiteDBHelper("D:\\Demo.db3");
for (char c = "A"; c <= "Z"; c++)
{
for (int i = 0; i < 100; i++)
{
SQLiteParameter[] parameters = new SQLiteParameter[]{
new SQLiteParameter("@Name",c+i.ToString()),
new SQLiteParameter("@TypeName",c.ToString()),
new SQLiteParameter("@addDate",DateTime.Now),
new SQLiteParameter("@UpdateTime",DateTime.Now.Date),
new SQLiteParameter("@Time",DateTime.Now.ToShortTimeString()),
new SQLiteParameter("@Comments","Just a Test"+i)
};
db.ExecuteNonQuery(sql, parameters);
}
}
}
public static void ShowData()
{
//查询从50条起的20条记录
string sql = "select * from test3 order by id desc limit 50 offset 20";
SQLiteDBHelper db = new SQLiteDBHelper("D:\\Demo.db3");
using (SQLiteDataReader reader = db.ExecuteReader(sql, null))
{
while (reader.Read())
{
Console.WriteLine("ID:{0},TypeName{1}", reader.GetInt64(0), reader.GetString(1));
}
}
}
}
}