//预处理命令
private bool PrepareCommand(BeyonDBCommand cmd, BeyonDBConnection conn, ref BeyonDBTransaction trans, bool useTrans, CommandType cmdType, string cmdText, params IDataParameter[] cmdParms)
{
try
{
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
cmd.Connection = conn;
cmd.CommandText = cmdText;
if (useTrans)
{
//启动事务，关联事务
trans = conn.BeginTransaction(IsolationLevel.ReadCommitted);
cmd.Transaction = trans;
}
cmd.CommandType = cmdType;
if (cmdParms != null)
{
foreach (BeyonDBParameter p in cmdParms)
{
cmd.Parameters.Add(p);
}
}
return(true);
}
catch (Exception ex)
{
return(false);
}
}
//执行数据库查询，返回DataReader对象
public BeyonDBDataReader ExecuteReader(string commandText)
{
BeyonDBDataReader result = null;
if (ConnectString == null || ConnectString.Length == 0)
{
throw new ArgumentNullException("connectionString");
}
if (commandText == null || commandText.Length == 0)
{
throw new ArgumentNullException("commandText");
}
BeyonDBCommand cmd = new BeyonDBCommand();
BeyonDBConnection con = new BeyonDBConnection(ConnectString);
BeyonDBTransaction trans = null;
if (!PrepareCommand(cmd, con, ref trans, true, CommandType.Text, commandText, null))
{
return(null);
}
try
{
result = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return(result);
}
catch (Exception ex)
{
con.Close();
return(null);
throw ex;
}
}
//测试数据库是否成功连接
public bool DetectDBConnectState()
{
using (BeyonDBConnection conn = new BeyonDBConnection(ConnectString))
{
try
{
//打开连接
conn.Open();
return(true);
}
catch (Exception ex)
{
//捕捉异常，不作其他处理
string str = ex.ToString();
return(false);
}
}
}
//执行数据库查询
public DataSet ExecuteDataSet(string commandText)
{
DataSet ds = new DataSet();
if (ConnectString == null || ConnectString.Length == 0)
{
throw new Exception("数据库连接字符串为空！");
}
if (commandText == null || commandText.Length == 0)
{
throw new Exception("SQL 语句为空！");
}
BeyonDBCommand cmd = new BeyonDBCommand();
using (BeyonDBConnection con = new BeyonDBConnection(ConnectString))
{
BeyonDBTransaction trans = null;
if (!PrepareCommand(cmd, con, ref trans, true, CommandType.Text, commandText, null))
{
return(ds);
}
try
{
BeyonDBDataAdapter sda = new BeyonDBDataAdapter(cmd);
sda.Fill(ds);
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (con != null)
{
if (con.State == ConnectionState.Open)
{
con.Clone();
}
}
}
}
return(ds);
}
//执行数据库操作，插入、更新、删除
public object ExecuteScalar(string commandText, params IDataParameter[] cmdParams)
{
object result;
if (ConnectString == null || ConnectString.Length == 0)
{
throw new ArgumentNullException("connectionString");
}
if (commandText == null || commandText.Length == 0)
{
throw new ArgumentNullException("commandText");
}
BeyonDBCommand cmd = new BeyonDBCommand();
using (BeyonDBConnection conn = new BeyonDBConnection(ConnectString))
{
//BeyonDB事务
BeyonDBTransaction trans = null;
if (!PrepareCommand(cmd, conn, ref trans, true, CommandType.Text, commandText, cmdParams))
{
return(null);
}
try
{
result = cmd.ExecuteScalar();
//提交事务
trans.Commit();
}
catch (Exception ex)
{
//回滚事务
trans.Rollback();
// return null;
throw ex;
}
}
return(result);
}
