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The first step is to select the object that needs to be updated. The method _getItem() selects an object that matches the passed item id in the variable itemID: private static Struct _getItem( Connection conn, int itemID ) throws SQLException { PreparedStatement pstmt = null; ResultSet rset = null; try { The main thing to note in this method is that we use a for update nowait clause. This means that the select will lock the table row if it succeeds, preventing any other user from updating the same row before we update it. If someone else has locked the row already, we will get an error message. The locking issues associated with this situation are discussed in much more detail in 16. The remainder of the method should be self-explanatory. pstmt = conn.prepareStatement( "select value(it) from item_table it" + " where it.id = and for update NOWAIT" ); pstmt.setInt( 1, itemID ); rset = pstmt.executeQuery(); Struct itemStruct = null; if (rset.next()) { // get the "item" object and its attributes itemStruct = (Struct) rset.getObject ( 1 ); } return itemStruct; } finally { // release resources in the finally clause. JDBCUtil.close( rset, pstmt); } } The method _demoUpdateUsingSTRUCT() that actually performs the update follows. It updates a supplied item object (that was selected in the form of a Struct using the method _getItem() presented earlier): private static void _demoUpdateUsingSTRUCT( Connection conn, int itemID, Struct itemStruct ) throws SQLException { PreparedStatement pstmt = null; STRUCT itemSTRUCT = (STRUCT) itemStruct; try { vb.net gs1 128 Packages matching GS1-128 - NuGet Gallery
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Generate, create EAN 128 in Visual Basic . NET applications; Easy to install & integrate barcode EAN 128 generation library SDK into VB . NET evelopments ... There are two overloads for each method that returns column data, one that takes an ordinal column position, and the other that takes the string name of the property. This second overload is a convenience, but makes the code in a business object much more readable. All the methods that return column data are null protected with code like this: public string GetString(string name) { return GetString(_dataReader.GetOrdinal(name)); } public virtual string GetString(int i) { if( _dataReader.IsDBNull(i)) return string.Empty; else return _dataReader.GetString(i); } If the value in the database is null, the method returns some more palatable value typically, whatever passes for empty for the specific data type. If the value isn t null, it simply returns the value from the underlying data reader object. For string values, the empty value is string.Empty; for numeric types, it is 0; and for Boolean types, it is false. You can look at the full code for SafeDataReader to see all the translations. Notice that the GetString() method that actually does the translation of values is marked as virtual. This allows you to override the behavior of any of these methods by creating a subclass of SafeDataReader. The GetOrdinal() method translates the column name into an ordinal (numeric) value, which can be used to actually retrieve the value from the underlying IDataReader object. GetOrdinal() looks like this: public int GetOrdinal(string name) { return _dataReader.GetOrdinal(name); } Every data type supported by IDataReader (and there are a lot of them) has a pair of methods that reads the data from the underling IDataReader object, replacing null values with empty default values as appropriate. word 2010 ean 128, create barcode in word 2007, birt pdf 417, birt code 39, birt upc-a, free code 39 font for word vb.net ean 128 reader .NET GS1 - 128 / EAN - 128 Generator for C#, ASP.NET, VB . NET ...
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VB . NET GS1-128 Generator for .NET class, Data Matrix, PDF417, QRCode, Code128, Code39. (Continued) As the first step, we retrieve the attributes of the object we selected earlier by invoking the method _getItem(): Object[] itemAttributes = itemStruct.getAttributes(); We modify the third attribute (the description) to a new value. This change happens only in memory. itemAttributes[2] = "item2 desc updated using prepared statement"; Next, we need to create the modified Struct object for which the first step is to retrieve the StructDescriptor from the object already selected: StructDescriptor itemDescriptor = itemSTRUCT.getDescriptor(); Then we create the STRUCT object with the modified attributes: Struct itemObject = new STRUCT ( itemDescriptor, conn, itemAttributes ); and use the standard update statement (note the use of the value() function again) to carry out the update: pstmt = conn.prepareStatement( "update item_table it set value(it) = " + " where it.id = " ); pstmt.setObject(1, itemObject ); pstmt.setInt(2, itemID ); int numOfRowsUpdated = pstmt.executeUpdate(); System.out.println( "Updated " + numOfRowsUpdated + " rows"); conn.commit(); } finally { // release resources in the finally clause. JDBCUtil.close( pstmt); } } vb.net ean 128 reader GS1 128 Generator DLL in VB | Free . NET program sample code ...
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