using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
namespace GameStatistics
{
/// <summary>
/// 数据库操作类
/// </summary>
class SqlHelp
{
private static SqlConnection connection;
#region 1.数据库连接字符串
/// <summary>
/// 连接数据库
/// </summary>
public static SqlConnection Connection
{
get
{
//获取连接字符串
string connString = @"Data Source=D1\SQL2008R2SP2;Initial Catalog=GameStatistics;User ID=sa;Password=123456";
if (connection == null)
{
connection = new SqlConnection(connString);
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Closed)
{
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Broken)
{
connection.Close();
connection.Open();
}
return connection;
}
}
#endregion
#region 2.执行查询,并返回查询所返回的结果集中第一行的第一列。忽略其他列或行
/// <summary>
/// 执行查询,并返回查询所返回的结果集中第一行的第一列。忽略其他列或行,返回受影响的行数
/// </summary>
/// <param name="sqlString">SQL查询语句</param>
/// <param name="commType">指定如何解释命令字符串</param>
/// <param name="parameters">表示 System.Data.SqlClient.SqlCommand 的参数</param>
/// <returns>受影响的行数</returns>
public static int ExecuteScalar(string sqlString, CommandType commType, params SqlParameter[] parameters)
{
SqlCommand command = new SqlCommand(sqlString, Connection);
command.Parameters.AddRange(parameters);
return (int)command.ExecuteScalar();
}
#endregion
#region 3.对连接执行 Transact-SQL语句并返回受影响的行数
/// <summary>
/// 对连接执行 Transact-SQL语句并返回受影响的行数,返回受影响的行数
/// </summary>
/// <param name="commText">SQL查询语句</param>
/// <param name="commType">指定如何解释命令字符串</param>
/// <param name="parameters">表示 System.Data.SqlClient.SqlCommand 的参数</param>
/// <returns>受影响的行数</returns>
public static int ExecuteCommand(string commText, CommandType commType, params SqlParameter[] parameters)
{
SqlCommand command = new SqlCommand(commText, Connection);
command.Parameters.AddRange(parameters);
return command.ExecuteNonQuery();
}
#endregion
#region 4.根据查询语句返回一个DataTable
/// <summary>
/// 根据查询语句返回一个DataTable
/// </summary>
/// <param name="commText">查询语句</param>
/// <param name="commType">命令字符串类型</param>
/// <returns>Table</returns>
public static DataTable GetDataTable(string commText, CommandType commType)
{
SqlCommand command = new SqlCommand(commText, Connection);
SqlDataAdapter da = new SqlDataAdapter(command);
DataSet ds = new DataSet();
da.Fill(ds, "table");
return ds.Tables["table"];
}
#endregion
#region 5.根据查询语句返回一个DataView
/// <summary>
/// 根据查询语句返回一个DataView
/// </summary>
/// <param name="commText">查询语句</param>
/// <param name="commType">命令字符串类型</param>
/// <returns>DataView</returns>
public static DataView GetDataView(string commText, CommandType commType)
{
SqlCommand command = new SqlCommand(commText, Connection);
SqlDataAdapter da = new SqlDataAdapter(command);
DataSet ds = new DataSet();
da.Fill(ds, "table");
return ds.Tables["table"].DefaultView;
}
#endregion
#region 6.根据查询语句返回一个datatable
/// <summary>
/// 根据查询语句返回一个datatable
/// </summary>
/// <param name="commText">连接字符串</param>
/// <param name="commType">命令字符串类型</param>
/// <param name="parameters">返回一组映射</param>
/// <returns>datatable</returns>
public static DataTable GetDataTable(string commText, CommandType commType, params SqlParameter[] parameters)
{
DataSet ds = new DataSet();
SqlCommand command = new SqlCommand(commText, Connection);
command.Parameters.AddRange(parameters);
SqlDataAdapter adapter = new SqlDataAdapter(command);
adapter.Fill(ds, "myTable");
return ds.Tables["myTable"];
}
#endregion
{
/// <summary>
/// 数据库操作类
/// </summary>
class SqlHelp
{
private static SqlConnection connection;
#region 1.数据库连接字符串
/// <summary>
/// 连接数据库
/// </summary>
public static SqlConnection Connection
{
get
{
//获取连接字符串
string connString = @"Data Source=D1\SQL2008R2SP2;Initial Catalog=GameStatistics;User ID=sa;Password=123456";
if (connection == null)
{
connection = new SqlConnection(connString);
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Closed)
{
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Broken)
{
connection.Close();
connection.Open();
}
return connection;
}
}
#endregion
#region 2.执行查询,并返回查询所返回的结果集中第一行的第一列。忽略其他列或行
/// <summary>
/// 执行查询,并返回查询所返回的结果集中第一行的第一列。忽略其他列或行,返回受影响的行数
/// </summary>
/// <param name="sqlString">SQL查询语句</param>
/// <param name="commType">指定如何解释命令字符串</param>
/// <param name="parameters">表示 System.Data.SqlClient.SqlCommand 的参数</param>
/// <returns>受影响的行数</returns>
public static int ExecuteScalar(string sqlString, CommandType commType, params SqlParameter[] parameters)
{
SqlCommand command = new SqlCommand(sqlString, Connection);
command.Parameters.AddRange(parameters);
return (int)command.ExecuteScalar();
}
#endregion
#region 3.对连接执行 Transact-SQL语句并返回受影响的行数
/// <summary>
/// 对连接执行 Transact-SQL语句并返回受影响的行数,返回受影响的行数
/// </summary>
/// <param name="commText">SQL查询语句</param>
/// <param name="commType">指定如何解释命令字符串</param>
/// <param name="parameters">表示 System.Data.SqlClient.SqlCommand 的参数</param>
/// <returns>受影响的行数</returns>
public static int ExecuteCommand(string commText, CommandType commType, params SqlParameter[] parameters)
{
SqlCommand command = new SqlCommand(commText, Connection);
command.Parameters.AddRange(parameters);
return command.ExecuteNonQuery();
}
#endregion
#region 4.根据查询语句返回一个DataTable
/// <summary>
/// 根据查询语句返回一个DataTable
/// </summary>
/// <param name="commText">查询语句</param>
/// <param name="commType">命令字符串类型</param>
/// <returns>Table</returns>
public static DataTable GetDataTable(string commText, CommandType commType)
{
SqlCommand command = new SqlCommand(commText, Connection);
SqlDataAdapter da = new SqlDataAdapter(command);
DataSet ds = new DataSet();
da.Fill(ds, "table");
return ds.Tables["table"];
}
#endregion
#region 5.根据查询语句返回一个DataView
/// <summary>
/// 根据查询语句返回一个DataView
/// </summary>
/// <param name="commText">查询语句</param>
/// <param name="commType">命令字符串类型</param>
/// <returns>DataView</returns>
public static DataView GetDataView(string commText, CommandType commType)
{
SqlCommand command = new SqlCommand(commText, Connection);
SqlDataAdapter da = new SqlDataAdapter(command);
DataSet ds = new DataSet();
da.Fill(ds, "table");
return ds.Tables["table"].DefaultView;
}
#endregion
#region 6.根据查询语句返回一个datatable
/// <summary>
/// 根据查询语句返回一个datatable
/// </summary>
/// <param name="commText">连接字符串</param>
/// <param name="commType">命令字符串类型</param>
/// <param name="parameters">返回一组映射</param>
/// <returns>datatable</returns>
public static DataTable GetDataTable(string commText, CommandType commType, params SqlParameter[] parameters)
{
DataSet ds = new DataSet();
SqlCommand command = new SqlCommand(commText, Connection);
command.Parameters.AddRange(parameters);
SqlDataAdapter adapter = new SqlDataAdapter(command);
adapter.Fill(ds, "myTable");
return ds.Tables["myTable"];
}
#endregion
}
}
}
转载于:https://my.oschina.net/dongri/blog/610893