Creating dynamic data window principle and implementation of: Flow square Home: http: //liulee.myrice.com
In practical applications, it is often necessary to dynamically create data windows according to user needs, and the general method is like this.
Add a data window control in a Window, such as dw_new, but the data window does not have Data Object, (blank)
You can use the following syntax to create:
DW_NEW.CREATE (LS_SYNTAX, LS_ERROR) // Create a syntax, error message
LS_SYNTAX can be formed by the following three methods:
First, the dynamic is created by SQL syntax:
// Connect to the example database of the PB
String ls_sql, ls_syntax, ls_error
LS_SYNTAX = 'SELECT * from Department'
LS_SYNTAX = SQLCA.SYNTAXFROMSQL (ls_sql, 'style (type = grid)', LS_ERROR)
IF LEN (LS_ERROR)> 0 THEN
MessageBox ('Error', 'SyntaxFromsql Error: ~ R' LS_ERROR)
Else
DW_NEW.CREATE (Ls_Syntax, Ls_ERROR)
IF LEN (LS_ERROR)> 0 THEN
MessageBox ("Error", "Create Have these Errors: ~ r" ls_error)
Else
DW_New.SetTransObject (SQLCA)
DW_New.Retrieve ()
END IF
END IF
Second, create the Syntax of another data window to create
String ls_syntax, ls_error
Ls_syntax = dw_test.describe ('DataWindow.Syntax')
DW_NEW.CREATE (Ls_Syntax, Ls_ERROR)
IF ls_error <> '' THEN
MessageBox ('Create Error', LS_ERROR)
Else
DW_New.SetTransObject (SQLCA)
DW_New.Retrieve ()
END IF
Third, read the PSR file to create
Sample
String ls_syntax, ls_error, ls_ret
LS_RET = char (13) char (10) // Enter key
INT Li_Filenum
Long li_length
Li_filenum = fileopen ("efef.psr", streammode !, read !, shared !, replace!)
/ / The following is the code of PB5
IF li_filenum> 0 THEN
Fileseek (li_filenum, 158, frombeginning!)
LI_LENGTH = FileRead (li_filenum, ls_syntax)
END IF
FILECLOSE (li_filenum)
IF li_length = 0 THEN RETURN
Ls_syntax = "Release 5;" LS_RET LS_SYNTAX
/ / Take the data section in LS_SYNTAX, 5.0 "sparse (names =" dept_name?) As a reference location
//6.0 with HTML (as a reference position)
Long Pos1, POS2
POS1 = POS (ls_syntax, 'spival (names = ", 1) POS2 = POS (ls_syntax,'", POS1 16)
LS_SYNTAX = Left (Ls_SYNTAX, POS1) MID (Ls_SYNTAX, POS1 1, POS2 - POS1 1)
DW_NEW.CREATE (Ls_Syntax, Ls_ERROR)
IF ls_error <> '' THEN
MessageBox ('Create Error', LS_ERROR)
Else
DW_New.SetTransObject (SQLCA)
DW_New.Retrieve ()
END IF
// PB6, PB7 code can be written by PB5 itself, but the file header and data window end tag are different.
