Java Reference
In-Depth Information
40
41
// update database connection status
connectedToDatabase =
true
;
42
43
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// set query and execute it
45
setQuery(query);
46
}
47
48
// get class that represents column type
49
public
Class getColumnClass(
int
column)
throws
IllegalStateException
50
{
51
// ensure database connection is available
if
(!connectedToDatabase)
throw
new
IllegalStateException(
"Not Connected to Database"
);
52
53
54
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// determine Java class of column
56
try
57
{
58
String className = metaData.getColumnClassName(column +
1
);
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// return Class object that represents className
return
Class.forName(className);
61
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}
63
catch
(Exception exception)
64
{
65
exception.printStackTrace();
66
}
67
68
return
Object.
class
;
// if problems occur above, assume type Object
69
}
70
71
// get number of columns in ResultSet
72
public
int
getColumnCount()
throws
IllegalStateException
73
{
74
// ensure database connection is available
75
if
(!connectedToDatabase)
76
throw
new
IllegalStateException(
"Not Connected to Database")
;
77
78
// determine number of columns
79
try
80
{
81
return
metaData.getColumnCount();
82
}
83
catch
(SQLException sqlException)
84
{
85
sqlException.printStackTrace();
86
}
87
88
return
0
;
// if problems occur above, return 0 for number of columns
89
}
90
Fig. 24.25
|
A
TableModel
that supplies
ResultSet
data to a
JTable
. (Part 2 of 4.)
