C# 创建动态sqlite表创建和插入函数
我有大约8-9个函数用于填充从SQL到Sqlite的表,我正在尝试创建一个动态函数,在这个函数上我将只传递一些参数,它将创建Sqlite表(如果它不存在),在一个循环中创建多个我想要插入到特定表中的类型的实例,设置它的属性,然后插入它。以下是示例函数:C# 创建动态sqlite表创建和插入函数,c#,android,sql,sqlite,xamarin,C#,Android,Sql,Sqlite,Xamarin,我有大约8-9个函数用于填充从SQL到Sqlite的表,我正在尝试创建一个动态函数,在这个函数上我将只传递一些参数,它将创建Sqlite表(如果它不存在),在一个循环中创建多个我想要插入到特定表中的类型的实例,设置它的属性,然后插入它。以下是示例函数: private bool ReloadItemsFromServer() { try { using (GS.cnn) { S
private bool ReloadItemsFromServer()
{
try
{
using (GS.cnn)
{
SqlCommand command = new SqlCommand("rsp_FillItem_MobileDevice;", GS.cnn);
command.CommandType = System.Data.CommandType.StoredProcedure;
GS.cnn.Open();
SqlDataReader reader = command.ExecuteReader();
if (reader.HasRows)
{
string dbPath = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "DataBase.PremierAndroid");
using (var sqliteConn = new SQLiteConnection(dbPath))
{
sqliteConn.CreateTable<Item>();
while (reader.Read())
{
{
var newItem = new Item();
newItem.ItemID = reader.GetInt32(0);
newItem.ItemBaseID = reader.GetInt32(1);
newItem.BrandID = reader.GetInt32(2);
newItem.Issue = reader.GetInt32(3);
sqliteConn.Insert(newItem);
}
}
}
}
else
{
_dlgAlert = new AlertDialog.Builder(this).Create();
_dlgAlert.SetMessage(Resources.GetString(Resource.String.NoRowsForItemFound));
_dlgAlert.SetTitle(Resources.GetString(Resource.String.Error));
_dlgAlert.SetButton("OK", delegate { });
_dlgAlert.Show();
return false;
}
reader.Close();
}
return true;
}
catch (Exception ex)
{
_dlgAlert = new AlertDialog.Builder(this).Create();
_dlgAlert.SetMessage(ex.Message);
_dlgAlert.SetTitle(Resources.GetString(Resource.String.Error));
_dlgAlert.SetButton("OK", delegate { });
_dlgAlert.Show();
return false;
}
finally
{
if (GS.cnn.State != ConnectionState.Closed)
{
GS.cnn.Close();
}
}
}
感谢您让反射和继承这样的帮助:
class Caller{
// see how it sends objects to method 'processAllClasses' with different classes
void main(){
ItemClass1 i1 = new ItemClass1();
i1.setItemsB(1,2);
processAllClasses(i1);
ItemClass2 i2 = new ItemClass2();
i2.setItemsB(10, 20);
processAllClasses(i2);
}
//using reflection and inherit to process different classes, obj is what need to be processed on.
//alternative way:
//get members from the type, then assign values to them one by one
void processAllClasses(ParentClass myobjvalue)
{
Type realtype = myobjvalue.GetType();
ParentClass myobj = new ParentClass();
MethodInfo mi = realtype.GetMethod("setItemsA");
object obj = Activator.CreateInstance(realtype);
Object[] parameter = new Object[] { myobjvalue };
mi.Invoke(obj, parameter);
}
}
class ParentClass {
}
class ItemClass1: ParentClass
{
int ItemID;
int ItemBaseID;
public void setItemsA(ItemClass1 itemclass1)
{
this.ItemID = itemclass1.ItemID;
this.ItemBaseID = itemclass1.ItemBaseID;
}
public void setItemsB(int ItemID, int ItemBaseID)
{
this.ItemID = ItemID;
this.ItemBaseID = ItemBaseID;
}
}
class ItemClass2 : ParentClass
{
int ContragentID;
int ContragentTypeID;
public void setItemsA(ItemClass2 itemclass2)
{
this.ContragentID = itemclass2.ContragentID;
this.ContragentTypeID = itemclass2.ContragentTypeID;
}
public void setItemsB(int ContragentID, int ContragentTypeID)
{
this.ContragentID = ContragentID;
this.ContragentTypeID = ContragentTypeID;
}
}
private bool LoadDataFromServer(string procedure, Type passedType)
{
try
{
using (GS.cnn)
{
SqlCommand command = new SqlCommand(procedure, GS.cnn);
command.CommandType = System.Data.CommandType.StoredProcedure;
GS.cnn.Open();
SqlDataReader reader = command.ExecuteReader();
if (reader.HasRows)
{
string dbPath = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "DataBase.PremierAndroid");
using (var sqliteConn = new SQLiteConnection(dbPath))
{
sqliteConn.CreateTable(passedType);
while (reader.Read()) //to do > i++ bla bla
{
{
var newItem = Activator.CreateInstance(passedType);
//newItem - loop through properties and set = reader.get(int/string)(i)
sqliteConn.Insert(newItem);
}
}
}
}
else
{
_dlgAlert = new AlertDialog.Builder(this).Create();
_dlgAlert.SetMessage(Resources.GetString(Resource.String.NoRowsForItemFound));
_dlgAlert.SetTitle(Resources.GetString(Resource.String.Error));
_dlgAlert.SetButton("OK", delegate { });
_dlgAlert.Show();
return false;
}
reader.Close();
}
return true;
}
catch (Exception ex)
{
_dlgAlert = new AlertDialog.Builder(this).Create();
_dlgAlert.SetMessage(ex.Message);
_dlgAlert.SetTitle(Resources.GetString(Resource.String.Error));
_dlgAlert.SetButton("OK", delegate { });
_dlgAlert.Show();
return false;
}
finally
{
if (GS.cnn.State != ConnectionState.Closed)
{
GS.cnn.Close();
}
}
}
class Caller{
// see how it sends objects to method 'processAllClasses' with different classes
void main(){
ItemClass1 i1 = new ItemClass1();
i1.setItemsB(1,2);
processAllClasses(i1);
ItemClass2 i2 = new ItemClass2();
i2.setItemsB(10, 20);
processAllClasses(i2);
}
//using reflection and inherit to process different classes, obj is what need to be processed on.
//alternative way:
//get members from the type, then assign values to them one by one
void processAllClasses(ParentClass myobjvalue)
{
Type realtype = myobjvalue.GetType();
ParentClass myobj = new ParentClass();
MethodInfo mi = realtype.GetMethod("setItemsA");
object obj = Activator.CreateInstance(realtype);
Object[] parameter = new Object[] { myobjvalue };
mi.Invoke(obj, parameter);
}
}
class ParentClass {
}
class ItemClass1: ParentClass
{
int ItemID;
int ItemBaseID;
public void setItemsA(ItemClass1 itemclass1)
{
this.ItemID = itemclass1.ItemID;
this.ItemBaseID = itemclass1.ItemBaseID;
}
public void setItemsB(int ItemID, int ItemBaseID)
{
this.ItemID = ItemID;
this.ItemBaseID = ItemBaseID;
}
}
class ItemClass2 : ParentClass
{
int ContragentID;
int ContragentTypeID;
public void setItemsA(ItemClass2 itemclass2)
{
this.ContragentID = itemclass2.ContragentID;
this.ContragentTypeID = itemclass2.ContragentTypeID;
}
public void setItemsB(int ContragentID, int ContragentTypeID)
{
this.ContragentID = ContragentID;
this.ContragentTypeID = ContragentTypeID;
}
}