-
Notifications
You must be signed in to change notification settings - Fork 51
Expand file tree
/
Copy pathSqlResourceImpl.java
More file actions
466 lines (419 loc) · 16.1 KB
/
SqlResourceImpl.java
File metadata and controls
466 lines (419 loc) · 16.1 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
/* Copyright (c) restSQL Project Contributors. Licensed under MIT. */
package org.restsql.core.impl;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import org.restsql.core.BinaryObject;
import org.restsql.core.ColumnMetaData;
import org.restsql.core.Config;
import org.restsql.core.Factory;
import org.restsql.core.InvalidRequestException;
import org.restsql.core.Request;
import org.restsql.core.Request.Type;
import org.restsql.core.RequestValue;
import org.restsql.core.ResponseValue;
import org.restsql.core.SqlBuilder;
import org.restsql.core.SqlBuilder.SqlStruct;
import org.restsql.core.SqlResource;
import org.restsql.core.SqlResourceException;
import org.restsql.core.SqlResourceMetaData;
import org.restsql.core.TableMetaData;
import org.restsql.core.TableMetaData.TableRole;
import org.restsql.core.Trigger;
import org.restsql.core.WriteResponse;
import org.restsql.core.sqlresource.SqlResourceDefinition;
import org.restsql.core.sqlresource.SqlResourceDefinitionUtils;
/**
* Represents a SQL Resource, a queryable and updatable database "view". Loads metadata on creation and caches it.
*
* @author Mark Sawers
*/
public class SqlResourceImpl implements SqlResource {
public static String removeWhitespaceFromSql(String sql) {
sql = sql.replaceAll("\\r", "");
sql = sql.replaceFirst("^\\s+", "");
sql = sql.replaceFirst("\\s+$", "");
sql = sql.replaceFirst("\\t+", " ");
sql = sql.replaceFirst("\\t+$", "");
sql = sql.replaceAll("\\t", " ");
return sql;
}
private final SqlResourceDefinition definition;
private final SqlResourceMetaData metaData;
private final String name;
private final SqlBuilder sqlBuilder;
private final List<Trigger> triggers;
public SqlResourceImpl(final String name, final SqlResourceDefinition definition,
final SqlResourceMetaData metaData, final SqlBuilder sqlBuilder, final List<Trigger> triggers)
throws SqlResourceException {
this.name = name;
this.definition = definition;
definition.getQuery().setValue(removeWhitespaceFromSql(definition.getQuery().getValue()));
this.metaData = metaData;
this.sqlBuilder = sqlBuilder;
this.triggers = triggers;
}
@Override
public SqlResourceDefinition getDefinition() {
return definition;
}
@Override
public SqlResourceMetaData getMetaData() {
return metaData;
}
@Override
public String getName() {
return name;
}
@Override
public List<Trigger> getTriggers() {
return triggers;
}
/**
* Executes query returning results as an object collection.
*
* @param request Request object
* @throws SqlResourceException if a database access error occurs
* @return list of rows, where each row is a map of name-value pairs
*/
@SuppressWarnings("unchecked")
@Override
public List<Map<String, Object>> read(final Request request) throws SqlResourceException {
return (List<Map<String, Object>>) execRead(request, null);
}
/**
* Executes query returning results as a string.
*
* @param request Request object
* @param mediaType response format, use internet media type e.g. application/xml
* @throws SqlResourceException if a database access error occurs
* @return list of rows, where each row is a map of name-value pairs
*/
@Override
public String read(final Request request, final String mediaType) throws SqlResourceException {
return (String) execRead(request, mediaType);
}
/**
* Executes database write (insert, update or delete).
*
* @param request Request object
* @throws SqlResourceException if the request is invalid or a database access error or trigger exception occurs
* @return write Response object
*/
@Override
public WriteResponse write(final Request request) throws SqlResourceException {
TriggerManager.executeTriggers(getName(), request, true);
// Init response
final WriteResponse response = new WriteResponse();
int rowsAffected = 0;
Set<ResponseValue> responseValues = null;
if (request.getType() == Type.INSERT) {
responseValues = new TreeSet<ResponseValue>();
}
boolean doParent = true;
Connection connection = null;
try {
connection = Factory.getConnection(SqlResourceDefinitionUtils.getDefaultDatabase(definition));
if (metaData.isHierarchical()) {
final Request childRequest = Factory.getChildRequest(request);
if (request.getChildrenParameters() != null) {
// Set up response
List<Set<ResponseValue>> childListResponseValues = null;
Set<ResponseValue> childResponseValues = null;
if (request.getType() == Type.INSERT) {
childListResponseValues = new ArrayList<Set<ResponseValue>>(request
.getChildrenParameters().size());
responseValues.add(new ResponseValue(getChildRowsName(), childListResponseValues,
Integer.MAX_VALUE));
// Add parent params, since we won't be executing the write on the parent
for (final TableMetaData table : metaData.getParentPlusExtTables()) {
addRequestParamsToResponseValues(request, responseValues, table);
}
}
// Delete, update or insert each specified child row
for (final List<RequestValue> childRowParams : request.getChildrenParameters()) {
if (request.getType() == Type.INSERT) {
// Set up response value set
childResponseValues = new TreeSet<ResponseValue>();
childListResponseValues.add(childResponseValues);
// Add the parent pks, since inserts ignore the resIds
childRowParams.addAll(request.getResourceIdentifiers());
} // else deletes and updates use resIds
childRequest.setParameters(childRowParams);
rowsAffected += execWrite(connection, childRequest, false, childResponseValues);
}
// Don't touch the parent(s)
doParent = false;
} else if (request.getType() == Request.Type.DELETE) {
// Delete all children and the parent(s)
if (request.getResourceIdentifiers() == null) {
childRequest.setParameters(request.getParameters());
}
rowsAffected += execWrite(connection, childRequest, false, responseValues);
// Now do the parent as well, doParent already equals true
}
// else just insert or update the parent (+ extensions)
} // else insert, update or delete the parent (+ extensions)
if (doParent) {
rowsAffected += execWrite(connection, request, true, responseValues);
}
TriggerManager.executeTriggers(getName(), request, false);
// Finalize response
if (request.getType() == Type.INSERT) {
response.addRow(responseValues);
}
response.addRowsAffected(rowsAffected);
} catch (final SQLException exception) {
throw new SqlResourceException(exception);
} finally {
if (connection != null) {
try {
connection.close();
} catch (final SQLException ignored) {
}
}
}
return response;
}
// Private utils
/**
* Converts the request params and resource IDs into response values and add to the result set.
*
* @throws InvalidRequestException
*/
private void addRequestParamsToResponseValues(final Request request,
final Set<ResponseValue> responseValues, final TableMetaData table)
throws InvalidRequestException {
if (request.getParameters() != null) {
for (final RequestValue param : request.getParameters()) {
final ColumnMetaData column = table.getColumns().get(param.getName());
if (column != null && !column.isNonqueriedForeignKey()) {
responseValues.add(new ResponseValue(param.getName(), param.getValue(), column
.getColumnNumber()));
}
}
}
if (request.getResourceIdentifiers() != null) {
for (final RequestValue param : request.getResourceIdentifiers()) {
final ColumnMetaData column = table.getColumns().get(param.getName());
if (column != null && !column.isNonqueriedForeignKey()) {
column.normalizeValue(param); // this is called in the SQL Builder as well, but it's required here
// for parent res ids
responseValues.add(new ResponseValue(param.getName(), param.getValue(), column
.getColumnNumber()));
}
}
}
}
/** Creates collection from result set for flat resource. */
private List<Map<String, Object>> buildReadResultsFlatCollection(final ResultSet resultSet)
throws SQLException {
final List<Map<String, Object>> results = new ArrayList<Map<String, Object>>();
while (resultSet.next()) {
final Map<String, Object> row = new HashMap<String, Object>(metaData.getAllReadColumns().size());
for (final ColumnMetaData column : metaData.getAllReadColumns()) {
// Simple name, value pairs will do
if (!column.isNonqueriedForeignKey()) {
row.put(column.getColumnLabel(), column.getResultByNumber(resultSet));
}
}
results.add(row);
}
return results;
}
/** Creates collection from result set for hierarchical resource. */
private List<Map<String, Object>> buildReadResultsHierachicalCollection(final ResultSet resultSet)
throws SQLException {
final List<Map<String, Object>> results = new ArrayList<Map<String, Object>>();
final List<Object> currentParentPkValues = new ArrayList<Object>(metaData.getParent()
.getPrimaryKeys().size());
boolean newParent = false;
final int numberParentElementColumns = metaData.getParentReadColumns().size();
final int numberChildElementColumns = metaData.getChildReadColumns().size();
final String childRowsName = getChildRowsName();
Map<String, Object> parentRow = null;
List<Map<String, Object>> childRows = null;
while (resultSet.next()) {
// Assess state of parent
if (currentParentPkValues.isEmpty()) {
// First row
newParent = true;
} else {
// Not the first row, check if parent differs from the last
newParent = false;
for (int i = 0; i < currentParentPkValues.size(); i++) {
final ColumnMetaData column = metaData.getParent().getPrimaryKeys().get(i);
if (!currentParentPkValues.get(i).equals(column.getResultByLabel(resultSet))) {
newParent = true;
break;
}
}
}
// Set current parent row pk values as well as in the parent row object
if (newParent) {
childRows = new ArrayList<Map<String, Object>>();
parentRow = new HashMap<String, Object>(numberParentElementColumns);
parentRow.put(childRowsName, childRows);
results.add(parentRow);
currentParentPkValues.clear();
for (final ColumnMetaData column : metaData.getParentReadColumns()) {
final Object value = column.getResultByLabel(resultSet);
if (column.isPrimaryKey() && column.getTableRole() == TableRole.Parent) {
currentParentPkValues.add(value);
}
parentRow.put(column.getColumnLabel(), value);
}
}
// Populate the child row object
Map<String, Object> childRow = new HashMap<String, Object>(numberChildElementColumns);
boolean nullPk = false;
for (final ColumnMetaData column : metaData.getChildReadColumns()) {
final Object value = column.getResultByLabel(resultSet);
if (column.isPrimaryKey()) {
nullPk = value == null;
}
childRow.put(column.getColumnLabel(), value);
}
if (nullPk) {
childRow = null;
} else {
childRows.add(childRow);
}
}
return results;
}
private Object execRead(final Request request, final String contentType) throws SqlResourceException {
request.extractParameters();
TriggerManager.executeTriggers(getName(), request, true);
final Object results;
Connection connection = null;
final SqlStruct sqlStruct = sqlBuilder.buildSelectSql(metaData, definition.getQuery().getValue(),
request);
try {
connection = Factory.getConnection(SqlResourceDefinitionUtils.getDefaultDatabase(definition));
final PreparedStatement statement = connection.prepareStatement(sqlStruct.getPreparedStatement());
if (Config.logger.isDebugEnabled()) {
Config.logger.debug("\n" + sqlStruct.getPreparedStatement() + "\n-----\n"
+ sqlStruct.getStatement());
}
request.getLogger().addSql(sqlStruct.getStatement());
for (int i = 0; i < sqlStruct.getPreparedValues().size(); i++) {
statement.setObject(i + 1, sqlStruct.getPreparedValues().get(i));
}
final ResultSet resultSet = statement.executeQuery();
if (metaData.isHierarchical()) {
if (contentType != null) {
results = Factory.getResponseSerializer(contentType).serializeReadHierarchical(this,
buildReadResultsHierachicalCollection(resultSet));
} else {
results = buildReadResultsHierachicalCollection(resultSet);
}
} else {
if (contentType != null) {
results = Factory.getResponseSerializer(contentType).serializeReadFlat(this, resultSet);
} else {
results = buildReadResultsFlatCollection(resultSet);
}
}
resultSet.close();
statement.close();
} catch (final SQLException exception) {
throw new SqlResourceException(exception, sqlStruct.getStatement());
} finally {
if (connection != null) {
try {
connection.close();
} catch (final SQLException ignored) {
}
}
}
TriggerManager.executeTriggers(getName(), request, false);
return results;
}
private int execWrite(final Connection connection, final Request request, final boolean doParent,
final Set<ResponseValue> responseValues) throws SqlResourceException {
final Map<String, SqlBuilder.SqlStruct> sqls = sqlBuilder.buildWriteSql(metaData, request, doParent);
// Remove sql for main table
final String mainTableName = doParent ? metaData.getParent().getQualifiedTableName() : metaData
.getChild().getQualifiedTableName();
final SqlBuilder.SqlStruct mainTableSqlStruct = sqls.remove(mainTableName);
// Do the write operation(s)
int rowsAffected = 0;
// Do the main table if insert
if (request.getType() == Type.INSERT) {
rowsAffected += execWrite(connection, request, mainTableSqlStruct, true);
}
// Do extensions next
for (final SqlBuilder.SqlStruct sqlStruct : sqls.values()) {
rowsAffected += execWrite(connection, request, sqlStruct, false);
}
// Do the main table if update or delete
if (request.getType() != Type.INSERT) {
rowsAffected += execWrite(connection, request, mainTableSqlStruct, true);
}
// Build inserted results for the write response
if (request.getType() == Type.INSERT) {
List<TableMetaData> tables;
if (doParent) {
tables = metaData.getParentPlusExtTables();
} else {
tables = metaData.getChildPlusExtTables();
}
for (final TableMetaData table : tables) {
addRequestParamsToResponseValues(request, responseValues, table);
// Find columns missing from the request params that are sequences and request the current value
for (final ColumnMetaData column : table.getColumns().values()) {
if (!request.hasParameter(column.getColumnLabel()) && column.isSequence()) {
final int value = Factory.getSequenceManager().getCurrentValue(connection,
column.getSequenceName());
responseValues.add(new ResponseValue(column.getColumnLabel(), new Integer(value),
column.getColumnNumber()));
}
}
}
}
return rowsAffected;
}
private int execWrite(final Connection connection, final Request request, final SqlStruct sqlStruct,
final boolean doMain) throws SqlResourceException {
int rowsAffected = 0;
if (sqlStruct != null) {
if (!doMain && sqlStruct.isClauseEmpty()) {
// do not execute update on extension, which would affect all rows
} else {
try {
final PreparedStatement statement = connection.prepareStatement(sqlStruct
.getPreparedStatement());
if (Config.logger.isDebugEnabled()) {
Config.logger.debug("\n" + sqlStruct.getPreparedStatement() + "\n"
+ sqlStruct.getStatement());
}
request.getLogger().addSql(sqlStruct.getStatement());
for (int i = 0; i < sqlStruct.getPreparedValues().size(); i++) {
final Object value = sqlStruct.getPreparedValues().get(i);
if (value instanceof BinaryObject) {
statement.setBytes(i + 1, ((BinaryObject) value).getBytes());
} else {
statement.setObject(i + 1, value);
}
}
rowsAffected = statement.executeUpdate();
statement.close();
} catch (final SQLException exception) {
throw new SqlResourceException(exception, sqlStruct.getStatement());
}
}
}
return rowsAffected;
}
private String getChildRowsName() {
return metaData.getChild().getRowSetAlias();
}
}