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1
22
23 package org.xquark.mapper.storage;
24
25 import java.sql.SQLException  ;
26 import java.util.List ;
27
28 import org.apache.commons.logging.Log;
29 import org.apache.commons.logging.LogFactory;
30 import org.xquark.mapper.dbms.AbstractConnection;
31 import org.xquark.mapper.dbms.TableInfo;
32 import org.xquark.mapper.mapping.ColumnMapping;
33 import org.xquark.mapper.metadata.PathNode;
34 import org.xquark.mapper.util.RepositoryProperties;
35
36
40 public class BatchQueryExtraDataExplorer extends QueryExtraDataExplorer
41 {
42 private static final String RCSRevision = "$Revision: 1.2 $";
43 private static final String RCSName = "$Name: $";
44
45 private static Log log = LogFactory.getLog(BatchQueryExtraDataExplorer.class);
46
47 private int currentRank = -2;
48 private int rank = -1;
49
50 public BatchQueryExtraDataExplorer(TableInfo tableInfo)
51 {
52 super(tableInfo);
53 }
54
57 public void getBranch(List paths, VarInfoSet tmpTable,
58 AbstractConnection connection)
59 throws SQLException
60 {
61 useStringDelimitor = connection.useStringDelimitor();
62 stmt = connection.getConnection().createStatement();
63 try
64 {
65 connection.setFetchSize(stmt, RepositoryProperties.getIntProperty(CONF_DATA_FETCHSIZE));
66 rs = stmt.executeQuery(generateStatement(paths, tmpTable));
67 notExhausted = true;
68 currentResultExhausted = false;
69 }
70 catch (SQLException e)
71 {
72 stmt.close();
73 throw e;
74 }
75 }
76
77 private String generateStatement(List paths, VarInfoSet tmpTable)
78 {
79 StringBuffer SQLStmt = new StringBuffer ();
80
81 ColumnMapping refColumn;
82 SubPathInfo path;
83
84 for (int i = 0; i < paths.size(); i++)
85 {
86 path = (SubPathInfo)paths.get(i);
87
88 if (i > 0)
89 SQLStmt.append("\nunion all\n");
90
91 SQLStmt.append("select t.");
92 SQLStmt.append(tmpTable.getRankColumnName());
93 SQLStmt.append(',');
94 SQLStmt.append(path.subPathIndex);
95 SQLStmt.append(" as n,v.uoid,v.path,v.type,v.pos,v.offset,v.data,v.num\nfrom ");
96 SQLStmt.append(tmpTable.getTableName());
97 SQLStmt.append(" t,");
98 SQLStmt.append(tableInfo.getName());
99 SQLStmt.append(" v\nwhere v.uoid between t.");
100 SQLStmt.append(tmpTable.getFirstColumnName());
101 SQLStmt.append(" and t.");
102 SQLStmt.append(tmpTable.getLastColumnName());
103 SQLStmt.append(" and t.");
104 SQLStmt.append(tmpTable.getPathColumnName());
105 SQLStmt.append('=');
106 SQLStmt.append(path.varPath.getPathID());
107 List subpaths = path.subPath.getSubPaths();
109 if (subpaths != null)
110 {
111 SQLStmt.append(" and v.path");
113
114 int subpathsCount = subpaths.size();
115 if (subpathsCount == 1)
116 {
117 SQLStmt.append("=");
118 SQLStmt.append(((PathNode)subpaths.get(0)).getPathID());
119 }
120 else
121 {
122 SQLStmt.append(" in(");
123
124 for (int j = 0; j < subpathsCount; j++)
125 {
126 SQLStmt.append(((PathNode)subpaths.get(j)).getPathID());
127 SQLStmt.append(',');
128 }
129 SQLStmt.setCharAt(SQLStmt.length()-1, ')');
130 }
131 }
132 }
133
134 SQLStmt.append("\norder by ");
135 SQLStmt.append(tmpTable.getRankColumnName());
136 SQLStmt.append(",n,num");
137
138 if (log.isDebugEnabled())
139 log.debug(">>> Value stmt for extra table:\n" + SQLStmt);
140
141 return SQLStmt.toString();
142 }
143
146 public boolean fetchNextRow() throws SQLException
147 {
148 try
149 {
150 if (resultActive())
151 {
152 notExhausted = rs.next();
153 if (notExhausted)
154 {
155 rank = rs.getInt(1);
156 subPathIndex = rs.getInt(2);
157 uoid = rs.getLong(3);
158 node.path = rs.getShort(4);
159 node.type = rs.getShort(5);
160 node.position = rs.getShort(6);
161 node.offset = rs.getInt(7);
162 node.data = rs.getString(8);
163 if (useStringDelimitor)
164 node.data = node.data.substring(0, node.data.length() - STRING_DELIMITOR_LENGTH);
165 node.rowNum = rs.getShort(9);
166 updateResultSegmentationFlag();
167 }
168 else
169 reset();
170 }
171 else
172 return false;
173
174 return notExhausted;
176 }
177 catch (SQLException e)
178 {
179 close();
180 throw e;
181 }
182 }
183
184 void setCurrentRank(int rank)
185 {
186 currentSubPathIndex = 0;
187 currentRank = rank;
188 updateResultSegmentationFlag();
189 }
190
191
192 public void reset() throws SQLException
193 {
194 super.reset();
195 currentRank = -2;
196 rank = -1;
197 }
198
199 protected void updateResultSegmentationFlag()
200 {
201 currentResultExhausted = (rank != currentRank) || (subPathIndex != currentSubPathIndex);
202 }
203 }
204
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