svn-gvsig-desktop / trunk / libraries / libDataSourceDBBaseDrivers / src / org / gvsig / data / datastores / vectorial / db / jdbc / postgresql / PostgresqlFeatureCollection.java @ 20058
History | View | Annotate | Download (6.67 KB)
1 |
package org.gvsig.data.datastores.vectorial.db.jdbc.postgresql; |
---|---|
2 |
|
3 |
import java.sql.Connection; |
4 |
import java.sql.ResultSet; |
5 |
import java.sql.Statement; |
6 |
import java.util.Iterator; |
7 |
import java.util.NoSuchElementException; |
8 |
|
9 |
import org.gvsig.data.datastores.vectorial.db.DBFeatureType; |
10 |
import org.gvsig.data.datastores.vectorial.db.jdbc.AbstractJDBCDataFeatureCollection; |
11 |
import org.gvsig.data.datastores.vectorial.db.jdbc.JDBCStore; |
12 |
import org.gvsig.data.datastores.vectorial.db.jdbc.exception.SQLException; |
13 |
import org.gvsig.data.exception.ReadException; |
14 |
import org.gvsig.data.vectorial.AbstractFeatureCollection; |
15 |
import org.gvsig.data.vectorial.IFeature; |
16 |
import org.gvsig.data.vectorial.IFeatureAttributeDescriptor; |
17 |
import org.gvsig.data.vectorial.IFeatureType; |
18 |
import org.gvsig.exceptions.BaseException; |
19 |
|
20 |
import com.iver.cit.gvsig.fmap.drivers.WKBParser2; |
21 |
|
22 |
public class PostgresqlFeatureCollection extends AbstractJDBCDataFeatureCollection { |
23 |
protected DBFeatureType featureType;
|
24 |
protected String filter; |
25 |
protected String totalFilter; |
26 |
protected JDBCStore store;
|
27 |
private String order; |
28 |
private int numReg=-1; |
29 |
private String sql; |
30 |
private String sqlCount; |
31 |
private String totalOrder; |
32 |
private int fetchSize=5000; |
33 |
|
34 |
PostgresqlFeatureCollection(JDBCStore store,IFeatureType type, String filter, String order) { |
35 |
this.store=store;
|
36 |
this.featureType=(DBFeatureType)type;
|
37 |
this.filter=filter;
|
38 |
this.order=order;
|
39 |
this.calculateWhere();
|
40 |
this.calculateOrder();
|
41 |
|
42 |
if (store.isUseSqlSource()){
|
43 |
this.sql = store.getSqlSource();
|
44 |
this.sqlCount = null; |
45 |
} else {
|
46 |
this.sql = this.store.getSqlSelectPart(); |
47 |
|
48 |
this.sqlCount = "Select count(*) From "+ ((PostgresqlStoreParameters)this.store.getParameters()).tableID(); |
49 |
if (!isStringEmpty(this.totalFilter)){ |
50 |
this.sql= this.sql + " Where " + this.totalFilter; |
51 |
this.sqlCount= this.sqlCount + " Where " + this.totalFilter; |
52 |
} |
53 |
if (!isStringEmpty(this.totalOrder)){ |
54 |
this.sql= this.sql + " Order by " + this.totalOrder; |
55 |
} |
56 |
} |
57 |
} |
58 |
|
59 |
private ResultSet getNewResulset(String aSql) throws ReadException{ |
60 |
this.store.open();
|
61 |
|
62 |
Connection conn = ((PostgresqlStore)this.store).getCurrentConnection(); |
63 |
try {
|
64 |
Statement st = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY,ResultSet.CONCUR_READ_ONLY); |
65 |
return st.executeQuery(aSql);
|
66 |
|
67 |
} catch (java.sql.SQLException e) {
|
68 |
throw new SQLException(aSql,this.store.getName(),e); |
69 |
} |
70 |
|
71 |
} |
72 |
|
73 |
|
74 |
private void calculateWhere(){ |
75 |
if (isStringEmpty(this.store.getBaseWhereClause())){ |
76 |
this.totalFilter = this.filter; |
77 |
} else {
|
78 |
this.totalFilter = "(" + this.store.getBaseWhereClause() + ") and " +this.filter; |
79 |
} |
80 |
} |
81 |
|
82 |
private void calculateOrder(){ |
83 |
if (isStringEmpty(this.store.getBaseOrder())){ |
84 |
this.totalOrder = this.order; |
85 |
} else {
|
86 |
this.totalOrder = this.store.getBaseOrder() + ", " +this.order; |
87 |
} |
88 |
|
89 |
} |
90 |
|
91 |
public int size() { |
92 |
checkModified(); |
93 |
try {
|
94 |
if (this.numReg < 0){ |
95 |
ResultSet r=null; |
96 |
try {
|
97 |
if (this.sqlCount != null){ |
98 |
r = this.getNewResulset(this.sqlCount); |
99 |
r.next(); |
100 |
numReg = r.getInt(1);
|
101 |
} else{
|
102 |
this.numReg = 0; |
103 |
r = this.getNewResulset(this.sql); |
104 |
while (r.next()){
|
105 |
this.numReg++;
|
106 |
} |
107 |
} |
108 |
} catch (java.sql.SQLException e) {
|
109 |
throw new ReadException(this.store.getName(),e); |
110 |
|
111 |
} finally{
|
112 |
try {
|
113 |
if (r != null) |
114 |
r.close(); |
115 |
} catch (java.sql.SQLException e) {
|
116 |
throw new ReadException(this.store.getName(),e); |
117 |
} |
118 |
} |
119 |
} |
120 |
return numReg;
|
121 |
} catch (BaseException e){
|
122 |
throw new RuntimeException(e); |
123 |
} |
124 |
|
125 |
} |
126 |
|
127 |
public Iterator iterator() { |
128 |
checkModified(); |
129 |
PostgresqlIterator dbIter; |
130 |
try {
|
131 |
dbIter=new PostgresqlIterator((PostgresqlStore)this.store,this.featureType,this.sql,this.fetchSize); |
132 |
} catch (ReadException e) {
|
133 |
throw new RuntimeException(e); |
134 |
} |
135 |
|
136 |
return dbIter;
|
137 |
} |
138 |
|
139 |
protected class PostgresqlIterator implements Iterator{ |
140 |
private ResultSet rs; |
141 |
private PostgresqlStore store;
|
142 |
private DBFeatureType featureType;
|
143 |
private String sql; |
144 |
private int fetchSize; |
145 |
private int page; |
146 |
private int index; |
147 |
|
148 |
public PostgresqlIterator(PostgresqlStore store,DBFeatureType featureType ,String sql,int fetchSize) throws ReadException{ |
149 |
this.sql = sql;
|
150 |
this.store = store;
|
151 |
this.featureType = featureType;
|
152 |
this.fetchSize= fetchSize;
|
153 |
this.page = 0; |
154 |
this.index = 0; |
155 |
this.createResulset();
|
156 |
} |
157 |
|
158 |
protected void createResulset() throws ReadException{ |
159 |
|
160 |
this.store.open();
|
161 |
|
162 |
String mSql = PostgresqlStoreUtils.addLimitsToSQL(
|
163 |
this.sql,
|
164 |
this.fetchSize,
|
165 |
this.page);
|
166 |
Connection conn = this.store.getCurrentConnection(); |
167 |
try {
|
168 |
if (this.rs != null){ |
169 |
this.rs.close();
|
170 |
// this.rs.getStatement().close();
|
171 |
} |
172 |
|
173 |
Statement st = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY,ResultSet.CONCUR_READ_ONLY); |
174 |
// System.out.println(mSql);
|
175 |
this.rs = st.executeQuery(mSql);
|
176 |
|
177 |
} catch (java.sql.SQLException e) {
|
178 |
throw new SQLException(mSql,this.store.getName(),e); |
179 |
} |
180 |
|
181 |
|
182 |
} |
183 |
|
184 |
public boolean hasNext(){ |
185 |
checkModified(); |
186 |
try {
|
187 |
if (rs.isLast()){
|
188 |
if (this.index == this.fetchSize){ |
189 |
this.index = 0; |
190 |
this.page++;
|
191 |
this.createResulset();
|
192 |
return this.hasNext(); |
193 |
} else{
|
194 |
return false; |
195 |
} |
196 |
|
197 |
} else {
|
198 |
return true; |
199 |
} |
200 |
} catch (java.sql.SQLException e) {
|
201 |
throw new RuntimeException( |
202 |
new ReadException(this.store.getName(),e) |
203 |
); |
204 |
} catch (ReadException e1){
|
205 |
throw new RuntimeException( |
206 |
new ReadException(this.store.getName(),e1) |
207 |
); |
208 |
} |
209 |
} |
210 |
|
211 |
public Object next() { |
212 |
checkModified(); |
213 |
if (!hasNext())
|
214 |
throw new NoSuchElementException(); |
215 |
return nextFeature();
|
216 |
} |
217 |
|
218 |
private IFeature nextFeature() {
|
219 |
try {
|
220 |
IFeature feature=null;
|
221 |
try {
|
222 |
if(rs.next()){
|
223 |
feature = this.store.createFeatureFromResulset(this.rs, this.featureType); |
224 |
} else {
|
225 |
rs.close(); |
226 |
// rs.getStatement().close();
|
227 |
throw new NoSuchElementException(); |
228 |
} |
229 |
if (rs.isAfterLast()){
|
230 |
rs.close(); |
231 |
// rs.getStatement().close();
|
232 |
} |
233 |
|
234 |
|
235 |
} catch (java.sql.SQLException e) {
|
236 |
throw new RuntimeException( |
237 |
new ReadException(this.store.getName(),e) |
238 |
); |
239 |
} |
240 |
this.index++;
|
241 |
return feature;
|
242 |
} catch (BaseException e){
|
243 |
throw new RuntimeException( |
244 |
new ReadException(this.store.getName(),e) |
245 |
); |
246 |
|
247 |
} |
248 |
} |
249 |
|
250 |
public void remove() { |
251 |
throw new UnsupportedOperationException(); |
252 |
} |
253 |
|
254 |
} |
255 |
|
256 |
public void dispose() { |
257 |
this.store.deleteObserver(this); |
258 |
this.store=null; |
259 |
this.featureType=null; |
260 |
|
261 |
} |
262 |
|
263 |
} |