Question

我正在尝试创建一个文本表，从文件中设置其值，然后使用Java代码中的hsqldb将这些值插回到普通表中，如下代码所示：

String sqlkeywordcreate=new String ("CREATE TABLE keywordsTable " + " (k_id INTEGER IDENTITY not NULL PRIMARY KEY,  keywords varchar(20))");
        String sqlkeywordcreate1=new String ("CREATE TEXT TABLE tempKeywordsTable " + " (key varchar(20))");
        System.out.println(sqlkeywordcreate);
        stmt1.executeUpdate(sqlkeywordcreate);
        stmt1.executeUpdate(sqlkeywordcreate1);
        int numOfFields=di.getAllTerms(); 
        String setTempKeywordsTable= new String ("set table "+ "tempKeywordsTable"+ " source 'E:/Thesis/ThesisWork/outdata/keywords.txt';ignore_first=false;shutdown=true");
        stmt1.execute( setTempKeywordsTable);
        String insertkey=  new String("INSERT INTO keywordsTable"+ "(keywords)"+ "select key from tempKeywordsTable");
        stmt1.executeUpdate(insertkey);
        String dropTempKey= new String("drop table tempKeywordsTable");
        stmt1.executeUpdate(dropTempKey);

但是当我运行这个时，我得到了这个例外：

java.sql.SQLException: bad TEXT table source file - line number: 0 org.hsqldb.HsqlException: Access is denied: E:/Thesis/ThesisWork/outdata/keywords.txt in statement [set table tempKeywordsTable source 'E:/Thesis/ThesisWork/outdata/keywords.txt']
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.executeUpdate(Unknown Source)
at ThesisCode.ReductionTry.main(ReductionTry.java:73)
Exception in thread "main" java.lang.NullPointerException
at ThesisCode.ReductionTry.main(ReductionTry.java:147)

我搜索了很多以找出问题，但我找不到任何东西。请给我一些建议。

Answer 1

在连接字符串时注意空格，你应该写：

String setTempKeywordsTable= new String ("set table "+"tempKeywordsTable"+ " source 'E:/Thesis/ThesisWork/outdata/keywords.

而不是：

String setTempKeywordsTable= new String ("set table"+ "tempKeywordsTable"+ " source 'E:/Thesis/ThesisWork/outdata/keywords.

你在字符串insertkey中犯了同样的错误。

Answer 2

我的一个更新：

现在我们必须使用相对路径。例如：db存在于此处："c:\folder1\folder2"。带有数据的文件应该在folder2或子文件夹中。

设置文本表hsqldb Java

2 个答案: