五：SQLiteHelper
最后，提供一个自己写的SQLiteHelper：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SQLite;
using System.Data;
using System.Data.Common;
namespace Com.Luminji.DataService.SQLHelpers
{
public class SQLiteHelper
{
/// <summary>
/// ConnectionString样例：Datasource=Test.db3;Pooling=true;FailIfMissing=false
/// </summary>
public static string ConnectionString { get; set; }
private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, string cmdText, params object[] p)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Parameters.Clear();
cmd.Connection = conn;
cmd.CommandText = cmdText;
cmd.CommandType = CommandType.Text;
cmd.CommandTimeout = 30;
if (p != null)
{
foreach (object parm in p)
cmd.Parameters.AddWithValue(string.Empty, parm);
}
}
public static DataSet ExecuteQuery(string cmdText, params object[] p)
{
using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))
{
using (SQLiteCommand command = new SQLiteCommand())
{
DataSet ds = new DataSet();
PrepareCommand(command, conn, cmdText, p);
SQLiteDataAdapter da = new SQLiteDataAdapter(command);
da.Fill(ds);
return ds;
}
}
}
public static int ExecuteNonQuery(string cmdText, params object[] p)
{
using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))
{
using (SQLiteCommand command = new SQLiteCommand())
{
PrepareCommand(command, conn, cmdText, p);
return command.ExecuteNonQuery();
}
}
}
public static SQLiteDataReader ExecuteReader(string cmdText, params object[] p)
{
using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))
{
using (SQLiteCommand command = new SQLiteCommand())
{
PrepareCommand(command, conn, cmdText, p);
return command.ExecuteReader(CommandBehavior.CloseConnection);
}
}
}
public static object ExecuteScalar(string cmdText, params object[] p)
{
using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))
{
using (SQLiteCommand command = new SQLiteCommand())
{
PrepareCommand(command, conn, cmdText, p);
return command.ExecuteScalar();
}
}
}
}
}
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SQLite;
using System.Data;
using System.Data.Common;
namespace Com.Luminji.DataService.SQLHelpers
{
public class SQLiteHelper
{
/// <summary>
/// ConnectionString样例：Datasource=Test.db3;Pooling=true;FailIfMissing=false
/// </summary>
public static string ConnectionString { get; set; }
private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, string cmdText, params object[] p)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Parameters.Clear();
cmd.Connection = conn;
cmd.CommandText = cmdText;
cmd.CommandType = CommandType.Text;
cmd.CommandTimeout = 30;
if (p != null)
{
foreach (object parm in p)
cmd.Parameters.AddWithValue(string.Empty, parm);
}
}
public static DataSet ExecuteQuery(string cmdText, params object[] p)
{
using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))
{
using (SQLiteCommand command = new SQLiteCommand())
{
DataSet ds = new DataSet();
PrepareCommand(command, conn, cmdText, p);
SQLiteDataAdapter da = new SQLiteDataAdapter(command);
da.Fill(ds);
return ds;
}
}
}
public static int ExecuteNonQuery(string cmdText, params object[] p)
{
using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))
{
using (SQLiteCommand command = new SQLiteCommand())
{
PrepareCommand(command, conn, cmdText, p);
return command.ExecuteNonQuery();
}
}
}
public static SQLiteDataReader ExecuteReader(string cmdText, params object[] p)
{
using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))
{
using (SQLiteCommand command = new SQLiteCommand())
{
PrepareCommand(command, conn, cmdText, p);
return command.ExecuteReader(CommandBehavior.CloseConnection);
}
}
}
public static object ExecuteScalar(string cmdText, params object[] p)
{
using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))
{
using (SQLiteCommand command = new SQLiteCommand())
{
PrepareCommand(command, conn, cmdText, p);
return command.ExecuteScalar();
}
}
}
}
}
六：附注
SQLite官方网站: http://www.sqlite. org/ 时第一眼看到关于SQLite的特性。
1. ACID事务
2. 零配置 – 无需安装和管理配置
3. 储存在单一磁盘文件中的一个完整的数据库
4. 数据库文件可以在不同字节顺序的机器间自由的共享
5. 支持数据库大小至2TB
6. 足够小, 大致3万行C代码, 250K
7. 比一些流行的数据库在大部分普通数据库操作要快
8. 简单, 轻松的API
9. 包含TCL绑定, 同时通过Wrapper支持其他语言的绑定
10. 良好注释的源代码, 并且有着90%以上的测试覆盖率
11. 独立: 没有额外依赖
12. Source完全的Open, 你可以用于任何用途, 包括出售它
13. 支持多种开发语言,C, PHP, Perl, Java, ASP .NET,Python
