数据库访问类的编写

数据库连接类的使用：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public class DataBase
{
//使用单件模式，只能实例化一个对象，所有方法都是静态方法；
private static DataBase _instance;
public DataBase()
{
}
public static DataBase GetInstance()
{
if(_instance==null)
{
_instance = new DataBase();
}
return _instance;
}
//得到并返回一个打开的数据库链接。
public static SqlConnection ReturnConn()
{
string strConn = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"];
SqlConnection Conn = new SqlConnection(strConn);
if (Conn.State.Equals(ConnectionState.Closed))
{
Conn.Open();
}
return Conn;
}
//①将存储过程转换成SqlCommand；（存储过程名，字段集合，数据库连接）
public static SqlCommand CreateCmd(string procName, SqlParameter[] prams, SqlConnection Conn)
{
SqlConnection SqlConn = Conn;
if (SqlConn.State.Equals(ConnectionState.Closed))
{
SqlConn.Open();
}
SqlCommand Cmd = new SqlCommand();
Cmd.CommandType = CommandType.StoredProcedure;
Cmd.Connection = SqlConn;
Cmd.CommandText = procName;
if (prams != null)
{
foreach (SqlParameter parameter in prams)
{
if (parameter != null)
{
Cmd.Parameters.Add(parameter);
}
}
}
return Cmd;
}
//②将存储过程转换成SqlCommand；（存储过程名，字段集合）
public static SqlCommand CreateCmd(string procName, SqlParameter[] prams)
{
SqlConnection Conn = ReturnConn();
SqlCommand Cmd = new SqlCommand();
Cmd.CommandType = CommandType.StoredProcedure;
Cmd.Connection = Conn;
Cmd.CommandText = procName;
if (prams != null)
{
foreach (SqlParameter parameter in prams)
{
if (parameter != null)
{
Cmd.Parameters.Add(parameter);
}
}
}
return Cmd;
}
//③将存储过程转换成SqlCommand；（存储过程名，数据库连接）
public static SqlCommand CreateCmd(string procName,SqlConnection Conn)
{
SqlConnection SqlConn = Conn;
if (SqlConn.State.Equals(ConnectionState.Closed))
{
SqlConn.Open();
}
SqlCommand Cmd = new SqlCommand();
Cmd.CommandType = CommandType.StoredProcedure;
Cmd.Connection = SqlConn;
Cmd.CommandText = procName;
return Cmd;
}
//④将存储过程转换成SqlCommand；（存储过程名）
public static SqlCommand CreateCmd(string procName)
{
SqlConnection Conn = ReturnConn();
SqlCommand Cmd = new SqlCommand();
Cmd.CommandType = CommandType.StoredProcedure;
Cmd.Connection = Conn;
Cmd.CommandText = procName;
return Cmd;
}
//①执行存储过程并返回一个SqlDataReader对象，（存储过程名，字段集合）
public static SqlDataReader RunProcGetReader(string procName, SqlParameter[] prams)
{
SqlCommand Cmd = CreateCmd(procName, prams);
SqlDataReader Dr = Cmd.ExecuteReader(CommandBehavior.CloseConnection);
return Dr;
}
//②执行存储过程并返回一个SqlDataReader对象，（存储过程名，字段集合，数据库连接）
public static SqlDataReader RunProcGetReader(string procName, SqlParameter[] prams, SqlConnection Conn)
{
SqlCommand Cmd = CreateCmd(procName, prams,Conn);
SqlDataReader Dr = Cmd.ExecuteReader(CommandBehavior.CloseConnection);
return Dr;
}
//③执行存储过程并返回一个SqlDataReader对象，（存储过程名，数据库连接）
public static SqlDataReader RunProcGetReader(string procName, SqlConnection Conn)
{
SqlCommand Cmd = CreateCmd(procName,Conn);
SqlDataReader Dr = Cmd.ExecuteReader(CommandBehavior.CloseConnection);
return Dr;
}
//④执行存储过程并返回一个SqlDataReader对象，（存储过程名）
public static SqlDataReader RunProcGetReader(string procName)
{
SqlCommand Cmd = CreateCmd(procName);
SqlDataReader Dr = Cmd.ExecuteReader(CommandBehavior.CloseConnection);
return Dr;
}
//执行存储过程并返回一个DataTable对象，（存储过程名，字段集合，数据库连接）
public static DataTable RunProcGetTable(string procName, SqlParameter[] prams, SqlConnection Conn)
{
SqlCommand Cmd = CreateCmd(procName, prams, Conn);
SqlDataAdapter Dtr = new SqlDataAdapter();
DataSet Ds = new DataSet();
Dtr.SelectCommand = Cmd;
Dtr.Fill(Ds);
DataTable Dt = Ds.Tables[0];
Conn.Close();
return Dt;
}
//①直接执行存储过程，返回整形数据。（存储过程名）
public static int RunExecute(string procName)
{
SqlConnection Conn = ReturnConn();
SqlCommand Cmd = CreateCmd(procName,Conn);
int intResult = Cmd.ExecuteNonQuery();
Conn.Close();
return intResult;
}
//②直接执行存储过程，返回整形数据。（存储过程名，字段集合）
public static int RunExecute(string procName,SqlParameter[] prams)
{
SqlConnection Conn = ReturnConn();
SqlCommand Cmd = CreateCmd(procName,prams,Conn);
int intResult = Cmd.ExecuteNonQuery();
Conn.Close();
return intResult;
}
public static int RunExecuteScalar(string procName)
{
SqlConnection Conn = ReturnConn();
SqlCommand Cmd = CreateCmd(procName, Conn);
int intResult = Convert.ToInt32(Cmd.ExecuteScalar());
Conn.Close();
return intResult;
}
public static int RunExecuteScalar(string procName, SqlParameter[] prams)
{
SqlConnection Conn = ReturnConn();
SqlCommand Cmd = CreateCmd(procName, prams, Conn);
int intResult =Convert.ToInt32(Cmd.ExecuteScalar());
Conn.Close();
return intResult;
}
}