1、查出的數據直接放到dataset中，並bind
string strcon = ConfigurationManager.AppSettings["conStr"];
string sqlstr = "select * from mrbccd";
SqlConnection con = new SqlConnection(strcon);
SqlDataAdapter da = new SqlDataAdapter(sqlstr,strcon);
DataSet ds = new DataSet();
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataKeyNames = new String[] {"BccdID" };
GridView1.DataBind();
2、查出的數據放入到datareader中，用法 http://blog.csdn.net/yanjun_xiaoli/article/details/4002736
需要conn.open，且需要關閉，使用commandBehavior.closeConnection 進行自動關閉
public static SqlDataReader ExecuteReader(string strSQL)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand(strSQL, connection);
try
{
connection.Open();
SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
//ExecuteReader（c）中，返回對象前不能關閉數據庫連接，須用CommandBehavior.CloseConnection；
//流模式讀取數據庫時，很難確定何時關閉數據連接，所以加上這個參數後，datareader讀取完畢後，數據庫連接自動斷開
return myReader;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
}
3、使用SqlDataAdapter 將數據放入DataSet，不需要做con.open和con.close
會自動開啓和關閉
public static DataSet Query(string SQLString)
{
using (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);
}
return ds;
}
}
4、SqlCommand.ExecuteNonQuery() 進行無返回值的查詢，
需要做connetion.open 不需要做close
public static int ExecuteSql(string SQLString)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
connection.Close();
throw e;
}
}
}
}
5、
/// <summary>
/// 執行多條SQL語句，實現數據庫事務。
/// </summary>
/// <param name="SQLStringList">多條SQL語句</param>
public static int ExecuteSqlTran(List<String> SQLStringList)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
SqlTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
{
int count = 0;
for (int n = 0; n < SQLStringList.Count; n++)
{
string strsql = SQLStringList[n];
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
count += cmd.ExecuteNonQuery();
}
}
tx.Commit();
return count;
}
catch
{
tx.Rollback();
return 0;
}
}
}
6、返回結果爲object，可以強行轉換爲model，只要欄位能對應
/// <summary>
/// 執行一條計算查詢結果語句，返回查詢結果（object）。
/// </summary>
/// <param name="SQLString">計算查詢結果語句</param>
/// <returns>查詢結果（object）</returns>
public static object GetSingle(string SQLString)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (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 e;
}
}
}
}
7、 IDataParameter[] iDATA = new SqlParameter[4]; // 建立一個傳入存儲過程的參數集合
iDATA[0] = new SqlParameter("@table", "ordertest");//添加
iDATA[1] = new SqlParameter("@table_prefix_date", "14610");
iDATA[2] = new SqlParameter("@prefix", "W12-");
iDATA[3] = new SqlParameter("@prefix_date", "146A");
DataSet ds = DbHelperSQL.RunProcedure("P_GetSeqVal", iDATA, "TEST");
/// <summary>
/// 執行存儲過程
/// </summary>
/// <param name="storedProcName">存儲過程名</param>
/// <param name="parameters">存儲過程參數</param>
/// <param name="tableName">DataSet結果中的表名</param>
/// <returns>DataSet</returns>
public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
{
using (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;
}
}
public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.SelectCommand.CommandTimeout = Times;
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
}
/// <summary>
/// 構建 SqlCommand 對象(用來返回一個結果集，而不是一個整數值)
/// </summary>
/// <param name="connection">數據庫連接</param>
/// <param name="storedProcName">存儲過程名</param>
/// <param name="parameters">存儲過程參數</param>
/// <returns>SqlCommand</returns>
private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
{
SqlCommand command = new SqlCommand(storedProcName, connection);
command.CommandType = CommandType.StoredProcedure;
foreach (SqlParameter parameter in parameters)
{
if (parameter != null)
{
// 檢查未分配值的輸出參數,將其分配以DBNull.Value.
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
command.Parameters.Add(parameter);
}
}
return command;
}