Question

我运行此代码

public void loadtwo()
{
    try{
        String query="SELECT Grade.GradeName, [Group].GroupName, AcademicInfo.EntranceYear, Semester.SemesterName, AcademicRank.AcademicRankName, Others.OthersName, AcademicInfo.AcademicInfoID,AcademicInfo.Major, AcademicInfo.Department\n "+
                "FROM AcademicInfo INNER JOIN\n" +
                "AcademicRank ON AcademicInfo.AcademicRankID = AcademicRank.AcademicRankID INNER JOIN\n" +
                "Grade ON AcademicInfo.GradeID = Grade.GradeID INNER JOIN\n" +
                "[Group] ON AcademicInfo.GroupID = [Group].GroupID INNER JOIN\n" +
                "Others ON AcademicInfo.OthersID = Others.OthersID INNER JOIN\n" +
                "Semester ON AcademicInfo.SemesterID = Semester.SemesterID";
        DBlabprj.rs=DBlabprj.stmt.executeQuery(query);
        int i=0;
        while(DBlabprj.rs.next())
        {
            edutbl.setValueAt(DBlabprj.rs.getString("GradeName"),i,0);
            edutbl.setValueAt(DBlabprj.rs.getString("GroupName"),i,1);
            edutbl.setValueAt(DBlabprj.rs.getInt("EntranceYear"),i,2);
            edutbl.setValueAt(DBlabprj.rs.getString("SemesterName"),i,3);
            edutbl.setValueAt(DBlabprj.rs.getString("AcademicRankName"),i,4);
            edutbl.setValueAt(DBlabprj.rs.getString("OthersName"),i,5);
            edutbl.setValueAt(DBlabprj.rs.getInt("AcademicInfoID"),i,6);
            edutbl.setValueAt(DBlabprj.rs.getString("Major"),i,7);
            edutbl.setValueAt(DBlabprj.rs.getString("Department"),i,8);

            i++;
        }
    }
    catch(Exception e)
    {
        JOptionPane.showMessageDialog(rootPane,e.getMessage());
    }
}

我收到此错误：

0＆GT; = 0

我无法理解错误，当我从群组中移除[]时会收到此错误：

单词＆＃39;组＆＃39;
附近的语法不正确

Answer 1

第二个错误是由于group是T-SQL的关键字，因此您可以尝试使用其他变量对表进行别名。

Answer 2

我已从您的查询中删除/ n并使用此替换空格。 Group是保留关键字，但如果它在括号内，则不会产生错误。最好尝试不同的名字。

String query="SELECT Grade.GradeName, [Group].GroupName, AcademicInfo.EntranceYear, Semester.SemesterName, AcademicRank.AcademicRankName, Others.OthersName, AcademicInfo.AcademicInfoID,AcademicInfo.Major, AcademicInfo.Department  "+
                       "FROM AcademicInfo INNER JOIN " +
                       "AcademicRank ON AcademicInfo.AcademicRankID = AcademicRank.AcademicRankID INNER JOIN " +
                       "Grade ON AcademicInfo.GradeID = Grade.GradeID INNER JOIN " +
                       "[Group] ON AcademicInfo.GroupID = [Group].GroupID INNER JOIN " +
                       "Others ON AcademicInfo.OthersID = Others.OthersID INNER JOIN " +
                       "Semester ON AcademicInfo.SemesterID = Semester.SemesterID";

JTable列以1开头而不是0，因此make int i=1;

edutbl.setValueAt(DBlabprj.rs.getString("GradeName"),i,0);

在运行程序时获得0＆gt; = 0

2 个答案: