Question

//Table names
public static final String TABLE_SUBJECTS = "SUBJECTS";
public static final String TABLE_TIMETABLE = "TIMETABLE";
public static final String TABLE_ATTENDANCE = "ATTENDANCE";


//Column names
public static final String COLUMN_SUBJECTS_SUBJECT = "SUBJECT"; //Subjects
public static final String COLUMN_TIMETABLE_SUBJECT = "SUBJECT"; //Timetable 
public static final String COLUMN_TIMETABLE_PERIOD = "PERIOD";
public static final String COLUMN_TIMETABLE_DAY = "DAY";
public static final String COLUMN_ATTENDANCE_SUBJECT = "SUBJECT"; 
//Attendance
public static final String COLUMN_ATTENDANCE_ATTENDED = "ATTENDED";
public static final String COLUMN_ATTENDANCE_TOTAL = "TOTAL";
public static final String COLUMN_ATTENDANCE_PERCENTAGE = "PERCENTAGE";


//Queries
private static final String SQL_CREATE_TABLE_TIMETABLE = "create table " + TABLE_TIMETABLE + "(" +
                                                         COLUMN_TIMETABLE_SUBJECT + " text, " +
                                                         COLUMN_TIMETABLE_PERIOD + " integer, " +
                                                         COLUMN_TIMETABLE_DAY + " text, " +
                                                         "PRIMARY KEY " + "(" + 
                                                         COLUMN_TIMETABLE_PERIOD + "," +
                                                         COLUMN_TIMETABLE_DAY + "), " +
                                                         "FOREIGN KEY " + "(" + COLUMN_TIMETABLE_SUBJECT + ") " +
                                                         "REFERENCES " + TABLE_SUBJECTS + " (" + COLUMN_SUBJECTS_SUBJECT +
                                                         ")" + ");";    
private static final String SQL_CREATE_TABLE_ATTENDANCE = "create table " + TABLE_ATTENDANCE + "(" +
                                                         COLUMN_ATTENDANCE_SUBJECT + " text, " +
                                                         COLUMN_ATTENDANCE_ATTENDED + " integer, " +
                                                         COLUMN_ATTENDANCE_TOTAL + " integer, " +
                                                         COLUMN_ATTENDANCE_PERCENTAGE + " integer, " +
                                                         "PRIMARY KEY " + "(" + COLUMN_ATTENDANCE_SUBJECT + "), " +
                                                         "FORIEGN KEY " + "(" + COLUMN_ATTENDANCE_SUBJECT + ") " +
                                                         "REFERENCES " + TABLE_SUBJECTS + " (" + COLUMN_SUBJECTS_SUBJECT + ")" +
                                                         ");";

所以，我正在尝试使用SQLite编写一个Android应用程序。我在尝试创建“ATTENDANCE”表时遇到了问题。它说“FOREIGN”附近的语法错误。现在，我没有得到这个，因为你可以看到我已经成功地创建了“TIMETABLE”表，并且在“ATTENDANCE”表中也遵循了或多或少相同的语法。我甚至试过评论外键。仅使用主键约束它可以正常工作，但是当我将它与外键约束结合时，错误再次出现。如果我注释掉主键部分，仅使用外键约束，那么它会在“SUBJECT”附近显示“语法错误”。所以，请帮忙。

Answer 1

您的SQL_CREATE_TABLE_ATTENDANCE字符串中有拼写错误。 FOREIGN KEY编写错误FORIEGN KEY

SQlite在Android上创建表错误

1 个答案: