|
1
|
/**
|
|
2
|
* Name: DBSAXElement.java
|
|
3
|
* Purpose: A Class that represents an XML element and its contents
|
|
4
|
* Copyright: 2000 Regents of the University of California and the
|
|
5
|
* National Center for Ecological Analysis and Synthesis
|
|
6
|
* Authors: Matt Jones
|
|
7
|
*
|
|
8
|
* Version: '$Id: DBSAXElement.java 133 2000-06-07 22:40:05Z jones $'
|
|
9
|
*/
|
|
10
|
|
|
11
|
package edu.ucsb.nceas.metacat;
|
|
12
|
|
|
13
|
import java.sql.*;
|
|
14
|
import java.io.IOException;
|
|
15
|
import java.util.Hashtable;
|
|
16
|
import java.util.Enumeration;
|
|
17
|
|
|
18
|
/**
|
|
19
|
* A Class that represents an XML element and its contents and
|
|
20
|
* can write its own representation to a database connection
|
|
21
|
*/
|
|
22
|
public class DBSAXElement extends BasicNode {
|
|
23
|
|
|
24
|
private Connection conn;
|
|
25
|
|
|
26
|
/**
|
|
27
|
* Construct a new element instance
|
|
28
|
*
|
|
29
|
* @param conn the JDBC Connection to which all information is written
|
|
30
|
* @param tagname the name of the element
|
|
31
|
* @param parent_id the parent id number for this element
|
|
32
|
*/
|
|
33
|
public DBSAXElement (Connection conn, String tagname,
|
|
34
|
long parent_id, int nodeIndex) {
|
|
35
|
|
|
36
|
super(tagname, parent_id, nodeIndex);
|
|
37
|
|
|
38
|
this.conn = conn;
|
|
39
|
if (getParentID() != 0) {
|
|
40
|
writeChildNodeToDB("ELEMENT", getTagName(), null, getNodeIndex());
|
|
41
|
} else {
|
|
42
|
writeChildNodeToDB("DOCUMENT", getTagName(), null, 0);
|
|
43
|
}
|
|
44
|
|
|
45
|
setElementID(getAssignedElementID());
|
|
46
|
}
|
|
47
|
|
|
48
|
/** creates SQL code and inserts new node into DB connection */
|
|
49
|
public void writeChildNodeToDB(String nodetype, String nodename,
|
|
50
|
String data, int nodeIndex) {
|
|
51
|
try {
|
|
52
|
PreparedStatement pstmt;
|
|
53
|
if (nodetype == "DOCUMENT") {
|
|
54
|
pstmt = conn.prepareStatement(
|
|
55
|
"INSERT INTO xml_nodes " +
|
|
56
|
"(nodeid, nodetype, nodename) " +
|
|
57
|
"VALUES (null, ?, ?)");
|
|
58
|
} else {
|
|
59
|
pstmt = conn.prepareStatement(
|
|
60
|
"INSERT INTO xml_nodes " +
|
|
61
|
"(nodeid, nodetype, nodename, " +
|
|
62
|
"parentnodeid, nodedata, nodeindex) " +
|
|
63
|
"VALUES (null, ?, ?, ?, ?, ?)");
|
|
64
|
}
|
|
65
|
|
|
66
|
// Bind the values to the query
|
|
67
|
pstmt.setString(1, nodetype);
|
|
68
|
pstmt.setString(2, nodename);
|
|
69
|
if (nodetype != "DOCUMENT") {
|
|
70
|
if (nodetype == "ELEMENT") {
|
|
71
|
pstmt.setLong(3, getParentID());
|
|
72
|
} else {
|
|
73
|
pstmt.setLong(3, getElementID());
|
|
74
|
}
|
|
75
|
pstmt.setString(4, data);
|
|
76
|
pstmt.setInt(5, nodeIndex);
|
|
77
|
}
|
|
78
|
// Do the insertion
|
|
79
|
pstmt.execute();
|
|
80
|
pstmt.close();
|
|
81
|
} catch (SQLException e) {
|
|
82
|
System.err.println("Error inserting node: (" + nodetype + ", " +
|
|
83
|
nodename + ", " +
|
|
84
|
data + ", " +
|
|
85
|
nodeIndex + ")" );
|
|
86
|
|
|
87
|
System.err.println(e.getMessage());
|
|
88
|
}
|
|
89
|
}
|
|
90
|
|
|
91
|
/**
|
|
92
|
* creates SQL code to put nodename for the document node
|
|
93
|
* into DB connection
|
|
94
|
*/
|
|
95
|
public void writeNodename(String nodename) {
|
|
96
|
try {
|
|
97
|
PreparedStatement pstmt;
|
|
98
|
pstmt = conn.prepareStatement(
|
|
99
|
"UPDATE xml_nodes set nodename = ? " +
|
|
100
|
"WHERE nodeid = ?");
|
|
101
|
|
|
102
|
// Bind the values to the query
|
|
103
|
pstmt.setString(1, nodename);
|
|
104
|
pstmt.setLong(2, getElementID());
|
|
105
|
// Do the insertion
|
|
106
|
pstmt.execute();
|
|
107
|
pstmt.close();
|
|
108
|
} catch (SQLException e) {
|
|
109
|
System.out.println(e.getMessage());
|
|
110
|
}
|
|
111
|
}
|
|
112
|
|
|
113
|
/** look up the assigned element id from DB connection */
|
|
114
|
private long getAssignedElementID() {
|
|
115
|
long assigned_id=0;
|
|
116
|
Statement stmt;
|
|
117
|
try {
|
|
118
|
stmt = conn.createStatement();
|
|
119
|
stmt.execute("SELECT xml_nodes_id_seq.currval FROM dual");
|
|
120
|
ResultSet rs = stmt.getResultSet();
|
|
121
|
boolean tableHasRows = rs.next();
|
|
122
|
if (tableHasRows) {
|
|
123
|
assigned_id = rs.getLong(1);
|
|
124
|
}
|
|
125
|
stmt.close();
|
|
126
|
} catch (SQLException e) {
|
|
127
|
System.out.println("Error getting id: " + e.getMessage());
|
|
128
|
}
|
|
129
|
|
|
130
|
// assign the new ID number
|
|
131
|
return assigned_id;
|
|
132
|
}
|
|
133
|
|
|
134
|
/** Add a new attribute to this element, or set its value */
|
|
135
|
public void setAttribute(String attName, String attValue) {
|
|
136
|
if (attName != null) {
|
|
137
|
// Enter the attribute in the hash table
|
|
138
|
super.setAttribute(attName, attValue);
|
|
139
|
|
|
140
|
writeChildNodeToDB("ATTRIBUTE", attName, attValue, 0);
|
|
141
|
// And enter the attribute in the database
|
|
142
|
} else {
|
|
143
|
System.err.println("Attribute name must not be null!");
|
|
144
|
}
|
|
145
|
}
|
|
146
|
}
|