postgresql的 sqlhelper
算是积累一下自己的代码库，这几天虽然压抑了些，但也算有成长
public string ConnectionString { get; set; }
public PgHelper(string connStr)
{
ConnectionString = connStr;
}
///
/// 执行SQL语句
///
/// SQL
/// 成功返回大于0的数字
public int ExecuteSQL(string sql)
{
int num2 = -1;
using (NpgsqlConnection connection = new NpgsqlConnection(ConnectionString))
{
using (NpgsqlCommand command = new NpgsqlCommand(sql, connection))
{
try
{
connection.Open();
num2=command.ExecuteNonQuery();
}
catch (NpgsqlException exception)
{
throw new Exception(string.Format("执行SQL【{0}】出错，详细信息为：{1}", sql, exception.Message));
}
finally
{
connection.Close();
}
}
}
return num2;
}
///
/// 参数化执行SQL语句
///
/// 带参数的SQL语句
/// 参数列表
///
public static int ExecuteParameterSQL(string sql, Dictionary paras)
{
int num2 = -1;
string strConn = ConfigurationManager.AppSettings["dbconn"].ToString();
using (NpgsqlConnection connection = new NpgsqlConnection(strConn))
{
using (NpgsqlCommand command = new NpgsqlCommand(sql, connection))
{
try
{
connection.Open();
foreach (string key in paras.Keys)
{
command.Parameters.Add(key, paras[key]);
}
num2 = command.ExecuteNonQuery();
}
catch (NpgsqlException exception)
{
throw new Exception(string.Format("执行SQL【{0}】出错，详细信息为：{1}", sql, exception.Message));
}
finally
{
connection.Close();
}
}
}
return num2;
}
///
/// 批量执行SQL语句(事务)
///
/// SQL语句
/// true:执行成功，false：执行失败
public bool ExecuteTransSQL(List lstSql)
{
if (lstSql == null || lstSql.Count == 0)
{
return false;
}
else
{
using (NpgsqlConnection dbConnection = new NpgsqlConnection(ConnectionString))
{
using (NpgsqlCommand command = new NpgsqlCommand())
{
NpgsqlTransaction ts = null;
try
{
dbConnection.Open();
ts = dbConnection.BeginTransaction();
command.Connection = dbConnection;
int cnt = 0;
foreach (string item in lstSql)
{
if (!String.IsNullOrEmpty(item) && item.Trim().Length > 0)
{
command.CommandText = item;
cnt += command.ExecuteNonQuery();
}
}
ts.Commit();
return true;
}
catch (NpgsqlException ex)
{
if (ts != null)
{
ts.Rollback();
}
throw new Exception(string.Format("执行SQL出错:{0}", ex.Message));
return false;
}
finally
{
dbConnection.Close();
}
}
}
}
}
///
/// 参数化批量执行SQL语句（事务）
///
///
///
public bool ExecuteParameterListSQL(Dictionary> dic)
{
string strConn = ConnectionString;
if (dic == null || dic.Count == 0)
{
return false;
}
else
{
NpgsqlTransaction ts = null;
using (NpgsqlConnection connection = new NpgsqlConnection(strConn))
{
using (NpgsqlCommand command = new NpgsqlCommand())
{
try
{
connection.Open();
ts = connection.BeginTransaction();
command.Connection = connection;
foreach (KeyValuePair> item in dic)
{
command.CommandText = item.Key;
foreach (KeyValuePair para in item.Value)
{
command.Parameters.Add(para.Key, para.Value);
}
command.ExecuteNonQuery();
}
ts.Commit();
return true;
}
catch (Exception ex)
{
if (ts != null)
{
ts.Rollback();
}
throw ex;
}
finally
{
connection.Close();
}
}
}
}
}
目前我用的最多的就是：批量插入。以前在用sql的时候没怎么批量插入过，现在发现真的蛮省事的。
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