public class MySqlHelper
{
private string ConnString; public MySqlHelper(string connectionString)
{
ConnString = connectionString;
}
public IList<T> RunMySqlSelect4ReturnList<T>(string strCommand) where T : new()
{ MySqlCommand mySqlCommand = new MySqlCommand();
mySqlCommand.CommandText = strCommand.ToString();
IList<PropertyInfo> ilPropertyInfo = typeof(T).GetProperties().ToList(); //p[0].Name =travel_id;
IList<T> ilResult = new List<T>(); DataTable dt = new DataTable();
using (MySqlConnection conn = new MySqlConnection(this.ConnString))
{
conn.Open();
using (MySqlCommand cmd = mySqlCommand)
{
cmd.Connection = conn;
using (MySqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.SequentialAccess))
{
dt.Load(rdr);
}
}
} foreach (DataRow dr in dt.Rows)
{
T tItem = new T();
foreach (var v in ilPropertyInfo)
{
if (dt.Columns[v.Name] == null) continue;
ConvertionExtensions.SetValue(tItem, v.Name, dr[v.Name]);
}
ilResult.Add(tItem);
}
return ilResult;
}
public T getSinggleObj<T>(string strCommand) where T : new()
{ MySqlCommand mySqlCommand = new MySqlCommand();
mySqlCommand.CommandText = strCommand.ToString();
IList<PropertyInfo> ilPropertyInfo = typeof(T).GetProperties().ToList(); //p[0].Name =travel_id;
T ilResult = new T(); DataTable dt = new DataTable();
using (MySqlConnection conn = new MySqlConnection(this.ConnString))
{
conn.Open();
using (MySqlCommand cmd = mySqlCommand)
{
cmd.Connection = conn;
using (MySqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.SequentialAccess))
{
dt.Load(rdr);
}
}
}
if (dt.Rows.Count <= )
{
return default(T);
}
else
{
foreach (DataRow dr in dt.Rows)
{
T tItem = new T();
foreach (var v in ilPropertyInfo)
{
if (dt.Columns[v.Name] == null) continue;
ConvertionExtensions.SetValue(tItem, v.Name, dr[v.Name]);
}
ilResult = tItem;
}
}
return ilResult;
}
public IList<T> RunMySqlSelect4ReturnList<T>(DataTable dts) where T : new()
{ IList<PropertyInfo> ilPropertyInfo = typeof(T).GetProperties().ToList(); //p[0].Name =travel_id;
IList<T> ilResult = new List<T>(); DataTable dt = dts; foreach (DataRow dr in dt.Rows)
{
T tItem = new T();
foreach (var v in ilPropertyInfo)
{
if (dt.Columns[v.Name] == null) continue;
ConvertionExtensions.SetValue(tItem, v.Name, dr[v.Name]);
}
ilResult.Add(tItem);
}
return ilResult;
}
}
public static class ConvertionExtensions
{
public static T ConvertTo<T>(this IConvertible convertibleValue)
{
var t = typeof(T);
if (null == convertibleValue)
{
return default(T);
}
if (!typeof(T).IsGenericType)
{
return (T)Convert.ChangeType(convertibleValue, typeof(T));
}
else
{
Type genericTypeDefinition = typeof(T).GetGenericTypeDefinition();
if (genericTypeDefinition == typeof(Nullable<>))
{
return (T)Convert.ChangeType(convertibleValue, Nullable.GetUnderlyingType(typeof(T)));
}
}
throw new InvalidCastException(string.Format("Invalid cast from type \"{0}\" to type \"{1}\".", convertibleValue.GetType().FullName, typeof(T).FullName));
} public static void SetValue(object inputObject, string propertyName, object propertyVal)
{
//find out the type
Type type = inputObject.GetType(); //get the property information based on the type
System.Reflection.PropertyInfo propertyInfo = type.GetProperty(propertyName); //find the property type
Type propertyType = propertyInfo.PropertyType; //Convert.ChangeType does not handle conversion to nullable types
//if the property type is nullable, we need to get the underlying type of the property
var targetType = IsNullableType(propertyInfo.PropertyType) ? Nullable.GetUnderlyingType(propertyInfo.PropertyType) : propertyInfo.PropertyType; //Returns an System.Object with the specified System.Type and whose value is
//equivalent to the specified object.
propertyVal = Convert.ChangeType(propertyVal, targetType); //Set the value of the property
propertyInfo.SetValue(inputObject, propertyVal, null); } private static bool IsNullableType(Type type)
{
return type.IsGenericType && type.GetGenericTypeDefinition().Equals(typeof(Nullable<>));
} }