引用其自己的列别名的查询的 UCanAccess "object not found" 错误

Question

由于 JDBC:ODBC 桥不再受 JAVA 8 支持，我尝试用 Ucanaccess V3.0 替换它，但我遇到了一些问题，请参阅下文。

这是我用来连接到我的数据库的代码：

String url = "jdbc:ucanaccess://D:/ADEL/ADEL Local/ADEL_DATA.accdb";
        try
        {
            //Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");

        }
        catch (java.lang.ClassNotFoundException e)
        {
            System.err.print("ClassNotFoundException: ");
            System.err.println(e.getMessage());
            ErrorFile.writeError(Thread.currentThread().getStackTrace()[2].getLineNumber(), e);
        }

要运行查询我之前使用JDBC:ODBC

的相同代码

Connection c = ConnectDB.doConnect();

String selectString = "SELECT DISTINCT [Maintenance input Check Due List].[Interval (Mos)], [Maintenance input Check Due List].InputAircraftHours, [Maintenance input Check Due List].InputAircraftLandings,  [Maintenance input Check Due List].Check, [Maintenance input Check Due List].Title, [Maintenance input Check Due List].InputNumber, [Maintenance input Check Due List].AircraftCurrentTSN, [Maintenance input Check Due List].AircraftCurrentCSN, [Maintenance input Check Due List].Aircraft, [Maintenance input Check Due List].InputDateOUT, [Maintenance input Check Due List].[Interval (Hrs)], [Maintenance input Check Due List].[Interval(Ldgs)], [Maintenance input Check Due List].[NextDueCheckMonth], [Maintenance input Check Due List].NextDueCheckHours, [Maintenance input Check Due List].NextDueCheckLdgs, [Maintenance input Check Due List].RemainCheckMonth, [Maintenance input Check Due List].RemainCheckHours,[Maintenance input Check Due List].RemainCheckLdgs,[Maintenance input Check Due List].InputRepairStation,[Maintenance input Check Due List].InputDescription "
            + "FROM [Maintenance input table] RIGHT JOIN ([Maintenance Schedule Check] RIGHT JOIN   [...]

try
    {
        stmt = c.createStatement();
        ResultSet data = stmt.executeQuery(selectString);
        System.out.print("(AircraftDueList-ln539) " + "requete passed\n");
        while (data.next())
        {[...]}
}
catch (SQLException e)
    {
        ErrorFile.writeError(Thread.currentThread().getStackTrace()[2].getLineNumber(), e);
        System.err.println("SQLException: "
                + e.getMessage());
        e.printStackTrace();
    }

但是这个查询抛出一个异常：

 SQLException: UCAExc:::3.0.0 user lacks privilege or object not found: NEXTDUECHECKMONTH
net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::3.0.0 user lacks privilege or object not found: NEXTDUECHECKMONTH
at     net.ucanaccess.jdbc.UcanaccessStatement.executeQuery(UcanaccessStatement.java:211)
at main.AircraftDueList.inspPack(AircraftDueList.java:626)
at main.AircraftDueList.createPDF(AircraftDueList.java:88)
at main.AircraftList.<init>(AircraftList.java:166)
at Launch.main(Launch.java:13)
Caused by: java.sql.SQLSyntaxErrorException: user lacks privilege or object not found: NEXTDUECHECKMONTH
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source)
at org.hsqldb.jdbc.JDBCStatement.executeQuery(Unknown Source)
at net.ucanaccess.jdbc.UcanaccessStatement.executeQuery(UcanaccessStatement.java:208)
... 4 more
Caused by: org.hsqldb.HsqlException: user lacks privilege or object not found: NEXTDUECHECKMONTH
at org.hsqldb.error.Error.error(Unknown Source)
at org.hsqldb.error.Error.error(Unknown Source)
at org.hsqldb.ExpressionColumn.checkColumnsResolved(Unknown Source)
at org.hsqldb.RangeVariable.resolveRangeTable(Unknown Source)
at org.hsqldb.QuerySpecification.resolveRangeVariables(Unknown Source)
at org.hsqldb.QuerySpecification.resolveReferences(Unknown Source)
at org.hsqldb.ParserDQL.XreadJoinedTableAsSubqueryOrNull(Unknown Source)
at org.hsqldb.ParserDQL.readTableOrSubquery(Unknown Source)
at org.hsqldb.ParserDQL.XreadTableReference(Unknown Source)
at org.hsqldb.ParserDQL.XreadFromClause(Unknown Source)
at org.hsqldb.ParserDQL.XreadTableExpression(Unknown Source)
at org.hsqldb.ParserDQL.XreadQuerySpecification(Unknown Source)
at org.hsqldb.ParserDQL.XreadSimpleTable(Unknown Source)
at org.hsqldb.ParserDQL.XreadQueryPrimary(Unknown Source)
at org.hsqldb.ParserDQL.XreadQueryTerm(Unknown Source)
at org.hsqldb.ParserDQL.XreadQueryExpressionBody(Unknown Source)
at org.hsqldb.ParserDQL.XreadQueryExpression(Unknown Source)
at org.hsqldb.ParserDQL.compileCursorSpecification(Unknown Source)
at org.hsqldb.ParserCommand.compilePart(Unknown Source)
at org.hsqldb.ParserCommand.compileStatements(Unknown Source)
at org.hsqldb.Session.executeDirectStatement(Unknown Source)
at org.hsqldb.Session.execute(Unknown Source)
... 7 more

此查询调用表和访问中的存储查询，"NEXTDUECHECKMONTH" 是访问中名为“[Maintenance input Check Due List]”的存储查询的别名字段。

在存储的查询 [Maintenance input Check Due List] 中，字段 NEXTDUECHECKMONTH 的构造如下：

IIf([Interval (Mos)] Is Null,Null,DateAdd("m",[Interval (Mos)],[InputDateOUT])) AS NextDueCheckMonth

有人成功解决过这类问题吗？

PS : 我的所有查询运行在 ACCESS

中成功

Answer 1

我发现了问题：我尝试在查询中创建别名并在此查询中使用它们； Ucanaccess 不喜欢它。

Answer 2

正如在对其他答案的评论中提到的，问题是查询有一个 WHERE 子句试图引用在同一查询中定义的列别名。这在 UCanAccess 中不起作用，例如

sql = 
        "SELECT Date1 AS DateAlias " +
        "FROM DateTest " +
        "WHERE DateAlias IS NOT NULL";

投掷

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::3.0.0 user lacks privilege or object not found: DATEALIAS

但它在 Access 本身中也不起作用，因为 Access 无法将别名识别为列名，因此会提示我们输入参数值：

此问题的一种解决方法是将原始查询封装为子查询，以便外部查询可以使用别名：

sql = 
        "SELECT DateAlias " +
        "FROM (SELECT Date1 AS DateAlias FROM DateTest) " +
        "WHERE DateAlias IS NOT NULL";

引用其自己的列别名的查询的 UCanAccess "object not found" 错误

UCanAccess "object not found" error for query that references its own column alias

java

ms-access

ucanaccess