winform中通⽤的数据库操作类using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using System.Data;
using System.Data.SqlClient;
namespace酒店管理系统
{
public class DBManage
{
private static string connectionString ;
//获取连接字符串，参数为服务器、数据库、⽤户名、密码
public static void connectToServer(string server,string database,string user,string pwd)
{
string con = "server="+server+";database="+database+";uid="+user+";pwd="+pwd;
}
//执⾏SQL语句，返回影响的记录数
public static int ExecuteSql(string SQLString)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand(SQLString, connection);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException E)
{
connection.Close();
throw new Exception(E.Message);
}
}
//执⾏多条SQL语句，实现数据库事务。
public static void ExecuteSqlTran(ArrayList SQLStringList)
{
SqlConnection conn = new SqlConnection(connectionString);
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
SqlTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
{
for (int n = 0; n < SQLStringList.Count; n++)
{
string strsql = SQLStringList[n].ToString();
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
cmd.ExecuteNonQuery();
}
}
tx.Commit();
throw new Exception(E.Message);
}
}
/
/执⾏⼀条计算查询结果语句，返回查询结果（object）。
public static object GetSingle(string SQLString)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand(SQLString, connection);
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))                {
return null;
}
else
{
return obj;
}
}
catch (System.Data.SqlClient.SqlException e)
{
connection.Close();
throw new Exception(e.Message);
}
}
//执⾏查询语句，返回SqlDataReader.
public static SqlDataReader ExecuteReader(string strSQL)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand(strSQL, connection);
try
{
connection.Open();
SqlDataReader myReader = cmd.ExecuteReader();
return myReader;
}
catch (System.Data.SqlClient.SqlException e)
{
throw new Exception(e.Message);
}
}
//执⾏查询语句，返回DataSet.
public static DataSet Query(string SQLString)
{
SqlConnection connection = new SqlConnection(connectionString);
DataSet ds = new DataSet();
try
{
connection.Open();
SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);                command.Fill(ds, "ds");
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
//参数为字段名和表名，返回最⼤值
public static int GetMaxID(string FieldName, string TableName)
{
string strsql = "select max (" + FieldName + ") from " + TableName;
object obj = GetSingle(strsql);
if (obj == null)
{
return1;
}
else
{
return int.Parse(obj.ToString());
}
}
//构建 SqlCommand 对象(⽤来返回⼀个结果集，⽽不是⼀个整数值)，参数为数据库连接、存储过程名、存储过程参数。
sqltransaction什么意思public static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)        {
SqlCommand command = new SqlCommand(storedProcName, connection);
command.CommandType = CommandType.StoredProcedure;
foreach (SqlParameter parameter in parameters)
{
command.Parameters.Add(parameter);
}
return command;
}
//创建 SqlCommand 对象实例(⽤来返回⼀个整数值)，参数为数据库连接、存储过程名、存储过程参数。
public static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
{
SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.Parameters.Add(new SqlParameter("ReturnValue",
SqlDbType.Int, 4, ParameterDirection.ReturnValue,
false, 0, 0, string.Empty, DataRowVersion.Default, null));
return command;
}
//执⾏存储过程，返回SqlDataReader
public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlDataReader returnReader;
connection.Open();
SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.CommandType = CommandType.StoredProcedure;
returnReader = command.ExecuteReader();
return returnReader;
}
//执⾏存储过程，返回结果集
public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
{
SqlConnection connection = new SqlConnection(connectionString);
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
int result;
connection.Open();
SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);            rowsAffected = command.ExecuteNonQuery();
result = (int)command.Parameters["ReturnValue"].Value;
//Connection.Close();
return result;
}
//public int count(string sqls)
//{
//    System.Data.SqlClient.SqlConnection sqlf = ateConnection();
//    System.Data.SqlClient.SqlCommand cmdf = new SqlCommand(sqls, sqlf);
//    sqlf.Open();
//    int num = Convert.ToInt32(cmdf.ExecuteScalar());
//    if (num > 0)
/
/    {
//        sqlf.Close();
//        return num;
//    }
//    else
//    {
//        sqlf.Close();
//        return 0;
//    }
//} //返回执⾏结果的总数
}
}

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