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; }}