Question

我试图通过外键创建3个表之间的关系。有些东西是错误的，因为弹出一个完整的错误。

SQLiteException: near "code_element" which is equal to KEY_ELEMENTCODE in DATABASE_TABLEELEMENTS

代码如下：

    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL(" CREATE TABLE " + DATABASE_TABLESTUDY + " (" +
                KEY_ROWSTUDYID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                KEY_STUDYCODE + " TEXT UNIQUE NOT NULL, " +
                KEY_STUDYNAME + " TEXT " +
                KEY_STUDANALYST + " TEXT " +
                KEY_STUDYPHOTO + " BLOB);"          
        );          
        db.execSQL(" CREATE TABLE " + DATABASE_TABLEELEMENTS + " (" +
                KEY_ROWELEMENTID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                KEY_STUDYID + " TEXT NOT NULL, FOREIGN KEY ("+KEY_STUDYID+") REFERENCES "+DATABASE_TABLESTUDY+" ("+KEY_ROWSTUDYID+"), " +
                KEY_ELEMENTCODE + " TEXT UNIQUE NOT NULL, " +
                KEY_ELEMENTNAME + " TEXT " +
                KEY_ELEMENTPHOTO + " BLOB);"            
        );          
        db.execSQL(" CREATE TABLE " + DATABASE_TABLEDATA + " (" +
                KEY_ROWDATATID  + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                KEY_ELEMENTID + " TEXT NOT NULL, FOREIGN KEY ("+KEY_ELEMENTID+") REFERENCES " + DATABASE_TABLEELEMENTS + " ("+KEY_ROWELEMENTID+"), " +
                KEY_DATEDATA + " TEXT NOT NULL, " +
                KEY_TIMEDATA + " TEXT NOT NULL, " +
                KEY_ACTIVITYDATA + " TEXT NOT NULL, " +
                KEY_HOURDATA + " TEXT NOT NULL, );"         
        );

Answer 1

所有3个Create Table语句都是错误的：

public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub
    db.execSQL(" CREATE TABLE " + DATABASE_TABLESTUDY + " (" +
            KEY_ROWSTUDYID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            KEY_STUDYCODE + " TEXT UNIQUE NOT NULL, " +
            KEY_STUDYNAME + " TEXT " +   // Missing comma!
            KEY_STUDANALYST + " TEXT " + // Missing comma!
            KEY_STUDYPHOTO + " BLOB);"
    );
    db.execSQL(" CREATE TABLE " + DATABASE_TABLEELEMENTS + " (" +
            KEY_ROWELEMENTID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            KEY_STUDYID + " TEXT NOT NULL, FOREIGN KEY ("+KEY_STUDYID+") REFERENCES "+DATABASE_TABLESTUDY+" ("+KEY_ROWSTUDYID+"), " +
            KEY_ELEMENTCODE + " TEXT UNIQUE NOT NULL, " +
            KEY_ELEMENTNAME + " TEXT " + // Missing comma!
            KEY_ELEMENTPHOTO + " BLOB);"
    );
    db.execSQL(" CREATE TABLE " + DATABASE_TABLEDATA + " (" +
            KEY_ROWDATATID  + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            KEY_ELEMENTID + " TEXT NOT NULL, FOREIGN KEY ("+KEY_ELEMENTID+") REFERENCES " + DATABASE_TABLEELEMENTS + " ("+KEY_ROWELEMENTID+"), " +
            KEY_DATEDATA + " TEXT NOT NULL, " +
            KEY_TIMEDATA + " TEXT NOT NULL, " +
            KEY_ACTIVITYDATA + " TEXT NOT NULL, " +
            KEY_HOURDATA + " TEXT NOT NULL, );" // Extra comma!
    );

他们应该是：

public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub
    db.execSQL(" CREATE TABLE " + DATABASE_TABLESTUDY + " (" +
            KEY_ROWSTUDYID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            KEY_STUDYCODE + " TEXT UNIQUE NOT NULL, " +
            KEY_STUDYNAME + " TEXT, " +
            KEY_STUDANALYST + " TEXT, " +
            KEY_STUDYPHOTO + " BLOB);"
    );
    db.execSQL(" CREATE TABLE " + DATABASE_TABLEELEMENTS + " (" +
            KEY_ROWELEMENTID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            KEY_STUDYID + " TEXT NOT NULL, FOREIGN KEY ("+KEY_STUDYID+") REFERENCES "+DATABASE_TABLESTUDY+" ("+KEY_ROWSTUDYID+"), " +
            KEY_ELEMENTCODE + " TEXT UNIQUE NOT NULL, " +
            KEY_ELEMENTNAME + " TEXT, " +
            KEY_ELEMENTPHOTO + " BLOB);"
    );
    db.execSQL(" CREATE TABLE " + DATABASE_TABLEDATA + " (" +
            KEY_ROWDATATID  + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            KEY_ELEMENTID + " TEXT NOT NULL, FOREIGN KEY ("+KEY_ELEMENTID+") REFERENCES " + DATABASE_TABLEELEMENTS + " ("+KEY_ROWELEMENTID+"), " +
            KEY_DATEDATA + " TEXT NOT NULL, " +
            KEY_TIMEDATA + " TEXT NOT NULL, " +
            KEY_ACTIVITYDATA + " TEXT NOT NULL, " +
            KEY_HOURDATA + " TEXT NOT NULL );"
    );

<强> [编辑]

我更新了我的回答以反映您的最新更改：

你的两个Create Table语句仍然是错误的（最后是额外的逗号）：

    db.execSQL(" CREATE TABLE " + DATABASE_TABLEELEMENTS + " (" +
            KEY_ROWELEMENTID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            KEY_STUDYID + " TEXT NOT NULL, FOREIGN KEY ("+KEY_STUDYID+") REFERENCES "+DATABASE_TABLESTUDY+" ("+KEY_ROWSTUDYID+"), " +
            KEY_ELEMENTCODE + " TEXT UNIQUE NOT NULL, " +
            KEY_ELEMENTNAME + " TEXT, " +
            KEY_ELEMENTPHOTO + " BLOB, );"       // Extra comma!
    );          
    db.execSQL(" CREATE TABLE " + DATABASE_TABLEDATA + " (" +
            KEY_ROWDATATID  + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            KEY_ELEMENTID + " TEXT NOT NULL, FOREIGN KEY ("+KEY_ELEMENTID+") REFERENCES " + DATABASE_TABLEELEMENTS + " ("+KEY_ROWELEMENTID+"), " +
            KEY_DATEDATA + " TEXT NOT NULL, " +
            KEY_TIMEDATA + " TEXT NOT NULL, " +
            KEY_ACTIVITYDATA + " TEXT NOT NULL, " +
            KEY_HOURDATA + " TEXT NOT NULL, );"  // Extra comma!
    );

他们应该是：

    db.execSQL(" CREATE TABLE " + DATABASE_TABLEELEMENTS + " (" +
            KEY_ROWELEMENTID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            KEY_STUDYID + " TEXT NOT NULL, FOREIGN KEY ("+KEY_STUDYID+") REFERENCES "+DATABASE_TABLESTUDY+" ("+KEY_ROWSTUDYID+"), " +
            KEY_ELEMENTCODE + " TEXT UNIQUE NOT NULL, " +
            KEY_ELEMENTNAME + " TEXT, " +
            KEY_ELEMENTPHOTO + " BLOB );"          
    );          
    db.execSQL(" CREATE TABLE " + DATABASE_TABLEDATA + " (" +
            KEY_ROWDATATID  + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            KEY_ELEMENTID + " TEXT NOT NULL, FOREIGN KEY ("+KEY_ELEMENTID+") REFERENCES " + DATABASE_TABLEELEMENTS + " ("+KEY_ROWELEMENTID+"), " +
            KEY_DATEDATA + " TEXT NOT NULL, " +
            KEY_TIMEDATA + " TEXT NOT NULL, " +
            KEY_ACTIVITYDATA + " TEXT NOT NULL, " +
            KEY_HOURDATA + " TEXT NOT NULL );"         
    );

Answer 2

在

KEY_STUDYNAME +＆＃34;文字＆＃34; + KEY_STUDANALYST +＆＃34;文字＆＃34; +

和

 KEY_ELEMENTNAME + " TEXT " +

<强>＆＃39;＆＃39;

在TEXT错过之后

。

请求

db.execSQL("CREATE TABLE DATABASE_TABLESTUDY  (
                KEY_ROWSTUDYID  INTEGER PRIMARY KEY AUTOINCREMENT, 
                KEY_STUDYCODE  TEXT UNIQUE NOT NULL, 
                KEY_STUDYNAME  TEXT,
                KEY_STUDANALYST  TEXT,
                KEY_STUDYPHOTO  BLOB);"
 db.execSQL("CREATE TABLE  DATABASE_TABLEELEMENTS (
                    KEY_ROWELEMENTID  INTEGER PRIMARY KEY AUTOINCREMENT, 
                    KEY_STUDYID  TEXT NOT NULL,
                    KEY_ELEMENTCODE TEXT UNIQUE NOT NULL, 
                    KEY_ELEMENTNAME  TEXT ,
                    KEY_ELEMENTPHOTO BLOB,  FOREIGN KEY (KEY_STUDYID) REFERENCES  DATABASE_TABLESTUDY ( KEY_ROWSTUDYID ));"
 db.execSQL("CREATE TABLE  DATABASE_TABLEDATA (
                    KEY_ROWDATATID   INTEGER PRIMARY KEY AUTOINCREMENT,
                    KEY_ELEMENTID  TEXT NOT NULL,  
                    KEY_DATEDATA TEXT NOT NULL,
                    KEY_TIMEDATA  TEXT NOT NULL,
                    KEY_ACTIVITYDATA  TEXT NOT NULL, 
                    KEY_HOURDATA  TEXT NOT NULL, FOREIGN KEY (KEY_ELEMENTID) REFERENCES   DATABASE_TABLEELEMENTS  (KEY_ROWELEMENTID) )"

成功。请尝试，只需将静态字符串更改为变量。

外键上的Sqlite错误

2 个答案: