执行多行查询不适用于单行查询所在的表别名

Question

这是我第一次使用ucanaccess，因为我刚发现我的以前版本的Eclipse不能用于Java 1.8，所以我可以访问我的Access DB 。我熟悉Java编程和RDBMS（目前使用Oracle），所以我不明白为什么我的代码出现错误。

这是我使用连接到DB中的码（可变DBFILE是用来存储访问DB路径的文件对象）：

\t \t try 
 
\t \t { 
 
\t \t \t String urlDB = "jdbc:ucanaccess://"+ dbFile.getAbsolutePath(); 
 
\t \t \t 
 
\t \t \t Connection conn = DriverManager.getConnection(urlDB, "", ""); 
 
\t \t \t System.out.println("Connection Successful\n"); 
 
\t \t \t 
 
\t \t \t Statement test = conn.createStatement(); 
 
/* \t \t \t ResultSet rs = test.executeQuery("SELECT e.* " 
 
                 + "FROM Employees e" 
 
                 + "WHERE e.EmployeeNo LIKE 'H%'" 
 
                 + "ORDER BY e.LastName"); 
 

 
\t \t \t System.out.println(); //spacing 
 

 
\t \t \t //retrieve column data 
 
\t \t \t while(rs.next()) 
 
\t \t \t { 
 
\t \t \t \t //can get data by column name instead of ID 
 
\t \t \t \t String id = rs.getString("ID"); 
 
\t \t \t \t String fName = rs.getString("FirstName"); 
 
\t \t \t \t String lName = rs.getString("LastName"); 
 
\t \t \t \t String dName = rs.getString("DisplayName"); 
 
\t \t \t \t \t \t 
 
\t \t \t \t System.out.println(id + "\t" + fName + "\t" + lName + "\t"); 
 
\t \t \t \t 
 
\t \t \t } 
 
*/ \t \t \t 
 
\t \t \t ResultSet rs = test.executeQuery("SELECT e.* FROM Employees e WHERE e.EmployeeNo LIKE '1%' ORDER BY e.LastName"); 
 
\t \t \t 
 
\t \t \t //get table information (i.e. column names) 
 
\t \t \t ResultSetMetaData rsmd = rs.getMetaData(); 
 
\t \t \t int dbColumnCount = rsmd.getColumnCount(); 
 
\t \t \t 
 
/* \t \t \t //db columns starts at 1 not 0 
 
\t \t \t for (int count = 1; count <= dbColumnCount; count++) 
 
\t \t \t { 
 
\t \t \t \t System.out.print(rsmd.getColumnName(count) + "\t"); 
 
\t \t \t } 
 
*/ \t \t \t 
 
\t \t \t System.out.format("%5s%10s%15s%20s%n", rsmd.getColumnName(1), rsmd.getColumnName(2), 
 
\t \t \t \t \t rsmd.getColumnName(3), rsmd.getColumnName(4)); 
 
\t \t \t //System.out.println(); 
 
\t \t \t 
 
\t \t \t while(rs.next()) 
 
\t \t \t { 
 
\t \t \t \t //can get data by column name instead of ID 
 
\t \t \t \t String id = rs.getString("ID"); 
 
\t \t \t \t String fName = rs.getString("FirstName"); 
 
\t \t \t \t String lName = rs.getString("LastName"); 
 
\t \t \t \t String dName = rs.getString("DisplayName"); 
 
\t \t \t \t \t \t 
 
\t \t \t \t //System.out.println(id + "\t" + fName + "\t" + lName + "\t"); 
 
\t \t \t \t System.out.format("%5s%10s%15s%20s%n", id, fName, lName, dName); 
 
\t \t \t } 
 
\t \t \t 
 
\t \t } 
 
\t \t catch (Exception e) 
 
\t \t { 
 
\t \t \t e.printStackTrace(); 
 
\t \t \t System.err.println("Could not connect to the Database"); 
 
\t \t \t System.err.println(e.getMessage()); 
 
\t \t } \t \t 
 
\t }

到结果集的第一个呼叫（多行查询）抛出了以下异常：

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::4.0.0 user lacks privilege or object not found: E 
 
\t at net.ucanaccess.jdbc.UcanaccessStatement.executeQuery(UcanaccessStatement.java:210) 
 
\t at DBConnect.<init>(InOutBoard.java:78) 
 
\t at InOutBoard.main(InOutBoard.java:47) 
 
Caused by: java.sql.SQLSyntaxErrorException: user lacks privilege or object not found: E 
 
\t at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) 
 
\t at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) 
 
\t at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source) 
 
\t at org.hsqldb.jdbc.JDBCStatement.executeQuery(Unknown Source) 
 
\t at net.ucanaccess.jdbc.UcanaccessStatement.executeQuery(UcanaccessStatement.java:208) 
 
\t ... 2 more 
 
Caused by: org.hsqldb.HsqlException: user lacks privilege or object not found: E 
 
\t at org.hsqldb.error.Error.error(Unknown Source) 
 
\t at org.hsqldb.error.Error.error(Unknown Source) 
 
\t at org.hsqldb.QuerySpecification.resolveColumnReferencesForAsterisk(Unknown Source) 
 
\t at org.hsqldb.QuerySpecification.resolveReferences(Unknown Source) 
 
\t at org.hsqldb.QueryExpression.resolve(Unknown Source) 
 
\t at org.hsqldb.ParserDQL.compileCursorSpecification(Unknown Source) 
 
\t at org.hsqldb.ParserCommand.compilePart(Unknown Source) 
 
\t at org.hsqldb.ParserCommand.compileStatements(Unknown Source) 
 
\t at org.hsqldb.Session.executeDirectStatement(Unknown Source) 
 
\t at org.hsqldb.Session.execute(Unknown Source) 
 
\t ... 5 more 
 
Could not connect to the Database 
 
UCAExc:::4.0.0 user lacks privilege or object not found: E

而如果我运行第二次调用ResultSet（单行查询），数据从表中正确返回。现在据我所知（除了在第一行中跨越多行），两个查询都是相同的。那为什么第一个抛出错误呢？我无法想象格式的选择会有所作为，但正如我所说，我知道使用ucanaccess。

任何帮助，将不胜感激。提前致谢！

Answer 1

的联系，我经常给有效这里太：
How to debug dynamic SQL in VBA

您串联SQL字符串，不检查是正确的。

ResultSet rs = test.executeQuery("SELECT e.* " 
           + "FROM Employees e" 
           + "WHERE e.EmployeeNo LIKE 'H%'" 
           + "ORDER BY e.LastName"); 

将导致

SELECT e.* FROM Employees eWHERE e.EmployeeNo LIKE 'H%'ORDER BY e.LastName 

它遗漏换行之间的空格。