CYQ. The path to the lightweight Data layer of Data using the triqu MAction value assignment (14)

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Content Overview

This article continues with the previous article. This section describes all operations related to values and assignments.
1: Native: Like Row Operations
2: extended: GetFrom and SetTo operations on the UI
3. Extension: Get and Set for non-UI operations

 

The common part of the code is described in advance. We assume that a row of data is queried using the following method.

MAction action = new MAction (TableNames. Users );
If (action. Fill ("UserName = ' '"))
{
// Here is the value and value assignment operation today
Action. Close ();
}

 

 

I. Native operations

1. Get row data

MDataRow row = action. Data;

2: Use the field value

String username = row ["UserName"]. Value;
// When enumeration exists
String username = row [Users. UserName]. Value;

3: Index Value

String userName = row [1]. Value;

 

Ii. Extended UI operations

Note: Control IDs comply with naming conventions: three letter prefixes + Field Names

For example, the TextBox Control ID is txtUserName.
Txt (prefix) + UserName (database field name)

 

1: GetFrom: set the value from the control to the row.

Method prototype:
Public void GetFrom (Control ct)
Public void GetFrom (Control ct, object value)

Example 1:

Action. GetFrom (txtUserName );
// Equivalent
Action. Data ["UserName"]. Value = txtUserName. Text;

Example 2:

Action. GetFrom (txtUserName, "passing by autumn ");
// Equivalent
Action. Data ["UserName"]. Value = "passing by autumn ";

 

2: SetTo: Set the data in the row to the control.

Original method:
Public void SetTo (Control ct)
Public void SetTo (Control ct, object value)
Public void SetTo (Control ct, object value, bool isControlEnabled)

Example 1:

Action. SetTo (txtUserName );
// Equivalent:
TxtUserName. Text = action. Data ["UserName"]. Value. ToString ();

Example 2:

Action. SetTo (txtUserName, "passing by autumn ");
// Equivalent
TxtUserName. Text = "passing by autumn ";

Example 3:

Action. SetTo (txtUserName, null, false );
// Equivalent:
TxtUserName. Text = action. Data ["UserName"]. Value. ToString ();
TxtUserName. Enabled = false;

 

Iii. Scaling: Non-UI operations

1: Get data from the row

Native method: public T Get <T> (object key)

Example 1:

String userName = action. Get <string> ("UserName ");
String userName = action. Get <string> (Users. UserName); // when enumeration exists
// Equivalent
String userName = action. Data ["UserName"]. Value. ToString ();

 

2: Set the value from the variable to the row.

Native method: public void Set (object key, object value)

Example 1:

Action. Set ("UserName", "passing by autumn ");
// Equivalent:
Action. Data ["UserName"]. Value = "passing by autumn ";

 

Statement:

This section describes the basic operations on a single row of data.
For the following instructions: the content and name are still not fixed.