public class DBHelper
{
private static string DBConnectString = "Data Source=.;Initial Catalog=Roseonly;Integrated Security=True";
private static SqlConnection conn;
public static SqlDataAdapter dap;
private static SqlCommand cmd;
private static SqlCommandBuilder builder;
private static DBHelper dBHelper;
public static DataSet ds = new DataSet();
public DBHelper()
{
conn = new SqlConnection(DBConnectString);
}
/// <summary>
/// 實例化DBHelper對象
/// </summary>
/// <returns></returns>
public static DBHelper Instance()
{
if (dBHelper == null)
{
dBHelper = new DBHelper();
}
return dBHelper;
}
/// <summary>
/// 打開數據庫連接
/// </summary>
void DBOpen()
{
if (conn.State == ConnectionState.Closed)
{
conn.Open();
}
}
/// <summary>
/// 關閉數據庫連接
/// </summary>
void DBClose()
{
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
}
/// <summary>
/// 執行SQL語句獲取數據集
/// </summary>
/// <param name="sql">sql語句</param>
/// <returns>DataTable數據集</returns>
public DataTable GetDataTableBySql(string sql)
{
DBOpen();
DataTable dt = new DataTable();
dap = new SqlDataAdapter(sql, conn);
try
{
dap.Fill(dt);
return dt;
}
catch
{
return null;
}
finally
{
DBClose();
}
}
/// <summary>
/// 執行SQL語句
/// </summary>
/// <param name="sql">SQL語句</param>
/// <returns>是否執行成功</returns>
public bool ExcuteSql(string sql)
{
DBOpen();
cmd = new SqlCommand(sql, conn);
try
{
cmd.ExecuteNonQuery();
return true;
}
catch
{
return false;
}
finally
{
DBClose();
}
}
/// <summary>
/// 執行存儲過程
/// </summary>
/// <param name="proName">存儲過程名稱</param>
/// <param name="paras">存儲過程參數</param>
/// <returns>是否執行成功</returns>
public bool ExcuteProcedure(string proName, SqlParameter[] paras)
{
DBOpen();
cmd = new SqlCommand(proName, conn);
cmd.CommandType = CommandType.StoredProcedure;
for (int i = 0; i < paras.Length; i++)
{
cmd.Parameters.Add(paras[i]);
}
try
{
cmd.ExecuteNonQuery();
return true;
}
catch
{
return false;
}
finally
{
DBClose();
}
}
/// <summary>
/// 執行存儲過程獲得數據集
/// </summary>
/// <param name="proName">存儲過程名</param>
/// <param name="paras">存儲過程參數</param>
/// <returns>DataTable數據集</returns>
public DataTable GetDataTableByProcedure(string proName, SqlParameter[] paras)
{
DBOpen();
cmd = new SqlCommand(proName, conn);
cmd.CommandType = CommandType.StoredProcedure;
dap = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
for (int i = 0; i < paras.Length; i++)
{
cmd.Parameters.Add(paras[i]);
}
try
{
dap.Fill(dt);
return dt;
}
catch
{
return null;
}
finally
{
DBClose();
}
}
/// <summary>
///
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public DataSet GetDataSetBySql(string sql)
{
DBOpen();
dap = new SqlDataAdapter(sql, conn);
try
{
builder = new SqlCommandBuilder(dap);
return ds;
}
catch
{
return null;
}
finally
{
DBClose();
}
}
}
.NET 中數據訪問用的 DBHelper 類
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