class SqlHelper
{
public static readonly string dbConnStr = ConfigurationManager.ConnectionStrings["dbConnStr"].ConnectionString;
//增删改 操作
public static int ExecuteNonQuery(string sql, params SqlParameter[] parameters)
{
using (SqlConnection conn = new SqlConnection(dbConnStr))
{
conn.Open();
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = sql;
if (null != parameters)
{
cmd.Parameters.AddRange(parameters);
}
return cmd.ExecuteNonQuery();
}
}
}
//查询 操作
public static object ExecuteScalar(string sql, params SqlParameter[] parameters)
{
using (SqlConnection conn = new SqlConnection(dbConnStr))
{
conn.Open();
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = sql;
if (null != parameters)
{
cmd.Parameters.AddRange(parameters);
}
return cmd.ExecuteScalar();
}
}
}
//查询结果少的sql
public static DataTable ExecuteDataTable(string sql, params SqlParameter[] parameters)
{
using (SqlConnection conn = new SqlConnection(dbConnStr))
{
conn.Open();
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = sql;
if (null != parameters)
{
cmd.Parameters.AddRange(parameters);
}
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataSet dataSet = new DataSet();
adapter.Fill(dataSet);
return dataSet.Tables[0];
}
}
}
//查询结果少的sql
public static DataSet ExecuteDataSet(string sql,SqlParameter[] parameters,String cls)
{
using (SqlConnection conn = new SqlConnection(dbConnStr))
{
conn.Open();
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = sql;
if (null != parameters)
{
cmd.Parameters.AddRange(parameters);
}
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataSet dataSet = new DataSet();
adapter.Fill(dataSet, cls);
// return dataSet.Tables[0];
return dataSet;
}
}
}
public static object FromDbValue(object value)
{
if (value == DBNull.Value)
{
return null;
}
else
{
return value;
}
}
public static object ToDbValue(object value)
{
if (value == null)
{
return DBNull.Value;
}
else
{
return value;
}
}
