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重写ComboBox类 Imports System.Windows.FormsPublic Class AutoCompleteComboBoxClass AutoCompleteComboBox Inherits ComboBox Public Sub New()Sub New() MyBase.New() End Sub Private mResetOn... 阅读全文
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A cursor is a mechanism by which you can assign a name to a "select statement" and manipulate the information within that SQL statement.Declare a Cursor OPEN Statement FETCH Statement CLOSE Statement ... 阅读全文
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The final step of working with cursors is to close the cursor once you have finished using it.The basic syntax to CLOSE the cursor is:CLOSE cursor_name;For example, you could close a cursor called c1 ... 阅读全文
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The purpose of using a cursor, in most cases, is to retrieve the rows from your cursor so that some type of operation can be performed on the data. After declaring and opening your cursor, the next st... 阅读全文
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Once you've declared your cursor, the next step is to open the cursor.The basic syntax to OPEN the cursor is:OPEN cursor_name;For example, you could open a cursor called c1 with the following command:... 阅读全文
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A cursor is a SELECT statement that is defined within the declaration section of your PLSQL code. We'll take a look at three different syntaxes for cursors.Cursor without parameters (simplest)The basi... 阅读全文