说明
java transactionext示例是从最受好评的开源项目中提取的实现代码，你可以参考下面示例的使用方式。
编程语言: Java
命名空间/包名称: org.apache.ojb.odmg
示例#1文件：
PerformanceODMGTest.java项目：
cniesen/ojb-1.0.4
/**
* read in all the PerformanceArticles from the RDBMS that have been inserted by <code>
* insertNewArticles(). The lookup is done with a cursor fetch, that is: a between
* Statement is used to select all inserted PerformanceArticles and Objects are read in by
* fetching from the cursor (JDBC ResultSet).
*/
protected void readArticlesByCursor() throws Exception {
TransactionExt tx = (TransactionExt) odmg.newTransaction();
// we don't want implicite locks when compare performance
tx.setImplicitLocking(false);
tx.begin();
// clear cache to read from DB
tx.getBroker().clearCache();
long start = System.currentTimeMillis();
OQLQuery query = odmg.newOQLQuery();
String sql =
"select allArticles from "
+ PerformanceArticle.class.getName()
+ " where articleId between "
+ new Integer(offsetId)
+ " and "
+ new Integer(offsetId + articleCount);
query.create(sql);
ManageableCollection collection = (ManageableCollection) query.execute();
Iterator iter = collection.ojbIterator();
int fetchCount = 0;
while (iter.hasNext()) {
fetchCount++;
iter.next();
}
long stop = System.currentTimeMillis();
logger.info("fetching " + fetchCount + " Objects: " + (stop - start) + " msec");
}示例#2文件：
PerformanceODMGTest.java项目：
cniesen/ojb-1.0.4
/**
* read in all the PerformanceArticles from the RDBMS that have been inserted by <code>
* insertNewArticles(). The lookup is done one by one, that is: a primary key based lookup
* is used.
*/
protected void readArticles() throws Exception {
TransactionExt tx = (TransactionExt) odmg.newTransaction();
// we don't want implicite locks when compare performance
tx.setImplicitLocking(false);
String sql =
"select allArticles from " + PerformanceArticle.class.getName() + " where articleId=$1";
long start = System.currentTimeMillis();
tx.begin();
for (int i = 0; i < articleCount; i++) {
OQLQuery query = odmg.newOQLQuery();
query.create(sql);
query.bind(arr[i].getArticleId());
query.execute();
}
tx.commit();
long stop = System.currentTimeMillis();
logger.info("querying " + articleCount + " Objects: " + (stop - start) + " msec");
}