| 1 |
15
|
jones
|
/**
|
| 2 |
|
|
* Name: DBSAXElement.java
|
| 3 |
|
|
* Purpose: A Class that represents an XML element and its contents
|
| 4 |
35
|
jones
|
* Copyright: 2000 Regents of the University of California and the
|
| 5 |
|
|
* National Center for Ecological Analysis and Synthesis
|
| 6 |
15
|
jones
|
* Authors: Matt Jones
|
| 7 |
|
|
*
|
| 8 |
|
|
* Version: '$Id$'
|
| 9 |
|
|
*/
|
| 10 |
|
|
|
| 11 |
51
|
jones
|
package edu.ucsb.nceas.metacat;
|
| 12 |
15
|
jones
|
|
| 13 |
|
|
import java.sql.*;
|
| 14 |
|
|
import java.io.IOException;
|
| 15 |
|
|
import java.util.Hashtable;
|
| 16 |
|
|
import java.util.Enumeration;
|
| 17 |
|
|
|
| 18 |
31
|
jones
|
/**
|
| 19 |
|
|
* A Class that represents an XML element and its contents and
|
| 20 |
|
|
* can write its own representation to a database connection
|
| 21 |
|
|
*/
|
| 22 |
21
|
jones
|
public class DBSAXElement extends BasicElement {
|
| 23 |
15
|
jones
|
|
| 24 |
16
|
jones
|
private Connection conn;
|
| 25 |
15
|
jones
|
|
| 26 |
31
|
jones
|
/**
|
| 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 |
18
|
jones
|
public DBSAXElement (Connection conn, String tagname,
|
| 34 |
|
|
long parent_id) {
|
| 35 |
21
|
jones
|
|
| 36 |
|
|
super(tagname, parent_id);
|
| 37 |
|
|
|
| 38 |
16
|
jones
|
this.conn = conn;
|
| 39 |
|
|
writeElementToDB();
|
| 40 |
22
|
jones
|
}
|
| 41 |
15
|
jones
|
|
| 42 |
19
|
jones
|
/** creates SQL code and inserts new element into DB connection */
|
| 43 |
|
|
private void writeElementToDB() {
|
| 44 |
|
|
try {
|
| 45 |
|
|
conn.setAutoCommit(false);
|
| 46 |
|
|
PreparedStatement pstmt;
|
| 47 |
29
|
jones
|
if (getParentID() != 0) {
|
| 48 |
19
|
jones
|
pstmt = conn.prepareStatement(
|
| 49 |
20
|
jones
|
"INSERT INTO xml_nodes (nodeid, nodetype, " +
|
| 50 |
|
|
"nodename, parentnodeid) VALUES (null, ?, ?, ?)");
|
| 51 |
19
|
jones
|
} else {
|
| 52 |
|
|
pstmt = conn.prepareStatement(
|
| 53 |
20
|
jones
|
"INSERT INTO xml_nodes (nodeid, nodetype, nodename) " +
|
| 54 |
|
|
"VALUES (null, ?, ?)");
|
| 55 |
19
|
jones
|
}
|
| 56 |
|
|
|
| 57 |
|
|
// Bind the values to the query
|
| 58 |
20
|
jones
|
pstmt.setString(1, "ELEMENT");
|
| 59 |
|
|
pstmt.setString(2, getTagName());
|
| 60 |
29
|
jones
|
if (getParentID() != 0) {
|
| 61 |
|
|
pstmt.setLong(3, getParentID());
|
| 62 |
19
|
jones
|
}
|
| 63 |
|
|
// Do the insertion
|
| 64 |
|
|
pstmt.execute();
|
| 65 |
|
|
pstmt.close();
|
| 66 |
29
|
jones
|
setElementID(getAssignedElementID());
|
| 67 |
19
|
jones
|
conn.commit();
|
| 68 |
|
|
conn.setAutoCommit(true);
|
| 69 |
|
|
} catch (SQLException e) {
|
| 70 |
|
|
System.out.println(e.getMessage());
|
| 71 |
|
|
}
|
| 72 |
|
|
}
|
| 73 |
|
|
|
| 74 |
|
|
/** look up the assigned element id from DB connection */
|
| 75 |
|
|
private long getAssignedElementID() {
|
| 76 |
|
|
long assigned_id=0;
|
| 77 |
16
|
jones
|
Statement stmt;
|
| 78 |
|
|
try {
|
| 79 |
|
|
stmt = conn.createStatement();
|
| 80 |
20
|
jones
|
stmt.execute("SELECT xml_nodes_id_seq.currval FROM dual");
|
| 81 |
16
|
jones
|
try {
|
| 82 |
|
|
ResultSet rs = stmt.getResultSet();
|
| 83 |
|
|
try {
|
| 84 |
|
|
boolean tableHasRows = rs.next();
|
| 85 |
|
|
if (tableHasRows) {
|
| 86 |
|
|
try {
|
| 87 |
19
|
jones
|
assigned_id = rs.getLong(1);
|
| 88 |
16
|
jones
|
} catch (SQLException e) {
|
| 89 |
|
|
System.out.println("Error with getInt: " + e.getMessage());
|
| 90 |
|
|
}
|
| 91 |
|
|
}
|
| 92 |
|
|
} catch (SQLException e) {
|
| 93 |
|
|
System.out.println("Error with next: " + e.getMessage());
|
| 94 |
|
|
}
|
| 95 |
|
|
} catch (SQLException e) {
|
| 96 |
|
|
System.out.println("Error with getrset: " + e.getMessage());
|
| 97 |
|
|
}
|
| 98 |
|
|
stmt.close();
|
| 99 |
|
|
} catch (SQLException e) {
|
| 100 |
|
|
System.out.println("Error getting id: " + e.getMessage());
|
| 101 |
|
|
}
|
| 102 |
|
|
|
| 103 |
19
|
jones
|
// assign the new ID number
|
| 104 |
|
|
return assigned_id;
|
| 105 |
16
|
jones
|
}
|
| 106 |
|
|
|
| 107 |
15
|
jones
|
/** Add a new attribute to this element, or set its value */
|
| 108 |
|
|
public void setAttribute(String attName, String attValue) {
|
| 109 |
|
|
if (attName != null) {
|
| 110 |
19
|
jones
|
// Enter the attribute in the hash table
|
| 111 |
29
|
jones
|
super.setAttribute(attName, attValue);
|
| 112 |
19
|
jones
|
|
| 113 |
|
|
// And enter the attribute in the database
|
| 114 |
|
|
try {
|
| 115 |
|
|
PreparedStatement pstmt = conn.prepareStatement(
|
| 116 |
20
|
jones
|
"INSERT INTO xml_nodes (nodeid, nodetype, " +
|
| 117 |
|
|
"nodename, nodedata, parentnodeid) VALUES (null, ?, ?, ?, ?)");
|
| 118 |
19
|
jones
|
|
| 119 |
|
|
// Bind the values to the query
|
| 120 |
20
|
jones
|
pstmt.setString(1, "ATTRIBUTE");
|
| 121 |
19
|
jones
|
pstmt.setString(2, attName);
|
| 122 |
|
|
pstmt.setString(3, attValue);
|
| 123 |
20
|
jones
|
pstmt.setLong(4, getElementID());
|
| 124 |
19
|
jones
|
|
| 125 |
|
|
// Do the insertion
|
| 126 |
|
|
pstmt.execute();
|
| 127 |
|
|
pstmt.close();
|
| 128 |
|
|
} catch (SQLException e) {
|
| 129 |
|
|
System.out.println(e.getMessage());
|
| 130 |
|
|
}
|
| 131 |
|
|
|
| 132 |
15
|
jones
|
} else {
|
| 133 |
|
|
System.err.println("Attribute name must not be null!");
|
| 134 |
|
|
}
|
| 135 |
|
|
}
|
| 136 |
|
|
|
| 137 |
18
|
jones
|
/** Write the element content to the db connection */
|
| 138 |
|
|
public void writeContentToDB() {
|
| 139 |
|
|
try {
|
| 140 |
|
|
PreparedStatement pstmt = conn.prepareStatement(
|
| 141 |
20
|
jones
|
"UPDATE xml_nodes SET nodedata = ? WHERE nodeid = ?");
|
| 142 |
18
|
jones
|
|
| 143 |
|
|
// Bind the values to the query
|
| 144 |
29
|
jones
|
pstmt.setString(1, getContent());
|
| 145 |
|
|
pstmt.setLong(2, getElementID());
|
| 146 |
18
|
jones
|
|
| 147 |
|
|
// Do the update
|
| 148 |
|
|
pstmt.execute();
|
| 149 |
|
|
pstmt.close();
|
| 150 |
|
|
|
| 151 |
|
|
} catch (SQLException e) {
|
| 152 |
|
|
System.out.println(e.getMessage());
|
| 153 |
|
|
}
|
| 154 |
|
|
}
|
| 155 |
15
|
jones
|
}
|