外键约束实现失败 Android Sqlite
Foreign Key constraint implementation failing Android Sqlite
当我 运行 没有 table 的应用程序 created.I 试图打开外键属性的实现但它没有工作。如果有另一种方法，那将非常 helpful.This 是项目的所有代码，我正在尝试进行患者预约安排 System.So 我正在尝试在我的预约中实现外键 table 如下所示。
DatabaseHelper.java
public class DatabaseHelper extends SQLiteOpenHelper {
//columns for the Patient table
public static final String TABLE_NAME = "Patient_Reg_table";
public static final String COLUMN_PATIENT_ID= "PatientID";
public static final String COLUMN_FNAME= "FName";
public static final String COLUMN_LNAME = "LName";
public static final String COLUMN_GENDER= "Gender";
public static final String COLUMN_USERNAME = "Username";
public static final String COLUMN_PASSWORD = "Password";
public static final String COLUMN_EMAIL = "Email";
public static final String COLUMN_PNUM= "PNum";
public static final String COLUMN_PADD = "Postal_Address";
public static final String COLUMN_PROVINCE= "Province";
//column for the Doctor Table
public static final String TABLE_NAME1 = "Doctor_Reg_table";
public static final String COLUMN_DOCTOR_ID= "Doctor_ID";
public static final String COLUMN_FNAME1= "F_Name";
public static final String COLUMN_LNAME1 = "L_Name";
public static final String COLUMN_GENDER1= "Sex";
public static final String COLUMN_USERNAME1 = "Username_Doc";
public static final String COLUMN_PASSWORD1 = "Password_Doc";
public static final String COLUMN_EMAIL1 = "Email_Doc";
public static final String COLUMN_PNUM1= "PNum_Doc";
public static final String COLUMN_PADD1 = "Postal_Address_Doc";
public static final String COLUMN_PROVINCE1= "Province_Doc";
public static final String COLUMN_SPECIALITY= "Speciality";
//column for the Appointment-Booking table
public static final String TABLE_NAME2= "Appointment_table";
public static final String Appointment_ID = "Appoint_ID";
public static final String Booking_Date = "B_date";
public static final String Pat_ID="Pat_ID";
public static final String Doc_ID="Doc_ID";
public static final String Booking_TimeSlot = "B_time";
public static final String Speciality1 = "Speciality1";
//SQL statement for creation of a database
public static final String DATABASE_NAME="hit200.db";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
SQLiteDatabase db = this.getWritableDatabase();
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(" CREATE TABLE " + TABLE_NAME + " (PatientID INTEGER PRIMARY KEY AUTOINCREMENT, FName TEXT , LName TEXT , Gender, Username TEXT , Password TEXT , Email TEXT , PNum INTEGER , Postal_Address TEXT , Province)");
db.execSQL(" CREATE TABLE " + TABLE_NAME1 + " ( Doctor_ID INTEGER PRIMARY KEY AUTOINCREMENT, F_Name TEXT , L_Name TEXT , Sex TEXT , Username_Doc TEXT , Password_Doc TEXT , Email_Doc TEXT , PNum_Doc INTEGER ,Postal_Address_Doc TEXT , Province_Doc TEXT , Speciality TEXT ) ");
db.execSQL(" CREATE TABLE " + TABLE_NAME2 + " (Appoint_ID INTEGER PRIMARY KEY AUTOINCREMENT, b_date date, b_time date, FOREIGN KEY (PATIENT_ID) REFERENCES TABLE_NAME(PatientID), FOREIGN KEY (DOCTOR_ID,CATEGORY) REFERENCES TABLE_NAME1 (Doctor_ID,Speciality)ON DELETE CASCADE)");
db.setForeignKeyConstraintsEnabled(true);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME);
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME1);
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME2);
}
public boolean insertData(String name, String lname, String gender , String username, String password, String email,
String pnum, String padd, String province)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_FNAME,name);
contentValues.put(COLUMN_LNAME,lname);
contentValues.put(COLUMN_GENDER,gender);
contentValues.put(COLUMN_USERNAME,username);
contentValues.put(COLUMN_PASSWORD,password);
contentValues.put(COLUMN_EMAIL,email);
contentValues.put(COLUMN_PADD,padd);
contentValues.put(COLUMN_PNUM,pnum);
contentValues.put(COLUMN_PROVINCE,province);
long rows=db.insertWithOnConflict(TABLE_NAME, null, contentValues,SQLiteDatabase.CONFLICT_REPLACE);
System.out.print(rows);
Log.d("User_cannot_to_dupliate",""+ rows);
long result0= db.insert(TABLE_NAME,null,contentValues);
if(result0 == -1)
return false;
else
return true;
}
public boolean InsertData(String name1, String lname1, String gender1 , String username1, String password1, String email1,
String padd1, String province1,String pnum1,String speciality1)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_FNAME1,name1);
contentValues.put(COLUMN_LNAME1,lname1);
contentValues.put(COLUMN_GENDER1,gender1);
contentValues.put(COLUMN_USERNAME1,username1);
contentValues.put(COLUMN_PASSWORD1,password1);
contentValues.put(COLUMN_EMAIL1,email1);
contentValues.put(COLUMN_PADD1,padd1);
contentValues.put(COLUMN_PROVINCE1,province1);
contentValues.put(COLUMN_PNUM1,pnum1);
contentValues.put(COLUMN_SPECIALITY,speciality1);
long rows=db.insertWithOnConflict(TABLE_NAME, null, contentValues,SQLiteDatabase.CONFLICT_REPLACE);
System.out.print(rows);
Log.d("User_cannot_to_dupliate",""+ rows);
long result= db.insert(TABLE_NAME1,null,contentValues);
if(result == -1)
return false;
else
return true;
}
public boolean UpdateData(String id,String name, String lname, String gender , String username, String password, String email,
String pnum, String padd, String province)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_PATIENT_ID,id);
contentValues.put(COLUMN_FNAME,name);
contentValues.put(COLUMN_LNAME,lname);
contentValues.put(COLUMN_GENDER,gender);
contentValues.put(COLUMN_USERNAME,username);
contentValues.put(COLUMN_PASSWORD,password);
contentValues.put(COLUMN_EMAIL,email);
contentValues.put(COLUMN_PADD,padd);
contentValues.put(COLUMN_PNUM,pnum);
contentValues.put(COLUMN_PROVINCE,province);
db.update(TABLE_NAME ,contentValues,"ID= ?", new String []{id});
return true;
}
public boolean UpdataData1(String id1,String name1, String lname1, String gender1 , String username1, String password1, String email1,
String padd1, String province1,String pnum1,String speciality1)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_DOCTOR_ID,id1);
contentValues.put(COLUMN_FNAME1,name1);
contentValues.put(COLUMN_LNAME1,lname1);
contentValues.put(COLUMN_GENDER1,gender1);
contentValues.put(COLUMN_USERNAME1,username1);
contentValues.put(COLUMN_PASSWORD1,password1);
contentValues.put(COLUMN_EMAIL1,email1);
contentValues.put(COLUMN_PADD1,padd1);
contentValues.put(COLUMN_PROVINCE1,province1);
contentValues.put(COLUMN_PNUM1,pnum1);
contentValues.put(COLUMN_SPECIALITY,speciality1);
db.update(TABLE_NAME1 ,contentValues,"ID= ?", new String []{id1});
return true;
}
public Integer DeleteData(String id)
{
SQLiteDatabase db=this.getWritableDatabase();
return db.delete(TABLE_NAME, "ID = ?",new String[] {id});
}
}
有几个问题，第一个是外键问题。您是说约束应该应用于列 PATIENT_ID，但尚未在 Appointment_table 中定义这样的列].
logcat 会包含一个堆栈跟踪，表明列 PATIENT_ID 不存在。
修复会导致错误，指出 TABLE_NAME 不存在，因为您已包含 TABLE_NAME 在引号内，因此按字面意思。
第二个外键也有类似的错误。然而，当您尝试使用 a 时，似乎是一个不必要的复合外键。 DOCTOR_ID 或 CATEGORY 列均未定义，TABLE_NAME1被视为文字，因为它包含在引号内。不需要复合列（CATEGORY 和 SPECIALITY），因为 DOCTOR_ID 中的 Doctor_Reg_table 唯一标识关系.另外包括 CATEGORY/SPECIALITY 会出现问题，因为不满足 FOREIGN KEYS 的索引要求。
最后，您不能在 onCreate 中使用 setForeignKeyConstraintsEnabled(true)，因为它在交易中 运行。您可以覆盖 onConFigure 方法：-
onConfigure added in API level 16 void onConfigure (SQLiteDatabase db)
Called when the database connection is being configured, to enable
features such as write-ahead logging or foreign key support.
This method is called before onCreate(SQLiteDatabase),
onUpgrade(SQLiteDatabase, int, int), onDowngrade(SQLiteDatabase, int,
int), or onOpen(SQLiteDatabase) are called. It should not modify the
database except to configure the database connection as required.
This method should only call methods that configure the parameters of
the database connection, such as enableWriteAheadLogging()
setForeignKeyConstraintsEnabled(boolean), setLocale(Locale),
setMaximumSize(long), or executing PRAGMA statements. onConfigure
以下代码有效，可能是您想要的：-
public class DatabaseHelper extends SQLiteOpenHelper {
//columns for the Patient table
public static final String TABLE_NAME = "Patient_Reg_table";
public static final String COLUMN_PATIENT_ID = "PatientID";
public static final String COLUMN_FNAME = "FName";
public static final String COLUMN_LNAME = "LName";
public static final String COLUMN_GENDER = "Gender";
public static final String COLUMN_USERNAME = "Username";
public static final String COLUMN_PASSWORD = "Password";
public static final String COLUMN_EMAIL = "Email";
public static final String COLUMN_PNUM = "PNum";
public static final String COLUMN_PADD = "Postal_Address";
public static final String COLUMN_PROVINCE = "Province";
//column for the Doctor Table
public static final String TABLE_NAME1 = "Doctor_Reg_table";
public static final String COLUMN_DOCTOR_ID = "Doctor_ID";
public static final String COLUMN_FNAME1 = "F_Name";
public static final String COLUMN_LNAME1 = "L_Name";
public static final String COLUMN_GENDER1 = "Sex";
public static final String COLUMN_USERNAME1 = "Username_Doc";
public static final String COLUMN_PASSWORD1 = "Password_Doc";
public static final String COLUMN_EMAIL1 = "Email_Doc";
public static final String COLUMN_PNUM1 = "PNum_Doc";
public static final String COLUMN_PADD1 = "Postal_Address_Doc";
public static final String COLUMN_PROVINCE1 = "Province_Doc";
public static final String COLUMN_SPECIALITY = "Speciality";
//column for the Appointment-Booking table
public static final String TABLE_NAME2 = "Appointment_table";
public static final String COLUMN_APPOINTMENT_ID = "Appoint_ID";
public static final String COLUMN_BOOKING_DATE = "B_date";
public static final String COLUMN_BOOKING_TIME = "B_time";
public static final String COLUMN_PAT_ID = "Pat_ID";
public static final String COLUMN_DOC_ID = "Doc_ID";
public static final String COLUMN_BOOKING_TIMESLOT = "B_time";
public static final String COLUMN_SPECIALITY1 = "Speciality1";
//SQL statement for creation of a database
public static final String DATABASE_NAME = "hit200.db";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
SQLiteDatabase db = this.getWritableDatabase();
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(" CREATE TABLE " + TABLE_NAME + "(" +
COLUMN_PATIENT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COLUMN_FNAME + " TEXT," +
COLUMN_LNAME + " TEXT," +
COLUMN_GENDER + " TEXT," +
COLUMN_USERNAME + " TEXT," +
COLUMN_PASSWORD + " TEXT," +
COLUMN_EMAIL + " TEXT," +
COLUMN_PNUM + " INTEGER," +
COLUMN_PADD + " TEXT," +
COLUMN_PROVINCE + " TEXT" +
")"
);
db.execSQL(" CREATE TABLE " + TABLE_NAME1 + "(" +
COLUMN_DOCTOR_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COLUMN_FNAME1 + " TEXT," +
COLUMN_LNAME1 + " TEXT," +
COLUMN_GENDER1 + " TEXT," +
COLUMN_USERNAME1 + " TEXT," +
COLUMN_PASSWORD1 + " TEXT," +
COLUMN_EMAIL1 + " TEXT," +
COLUMN_PNUM1 + " INTEGER," +
COLUMN_PADD1 + " TEXT," +
COLUMN_PROVINCE1 + " TEXT," +
COLUMN_SPECIALITY + " TEXT" +
")"
);
db.execSQL(" CREATE TABLE " + TABLE_NAME2 + " (" +
COLUMN_APPOINTMENT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
COLUMN_PAT_ID + " INTEGER," + //<<<< NOT NULL ADVISABLE
COLUMN_DOC_ID + " INTEGER," + //<<<< NOt NULL ADVISABLE
COLUMN_BOOKING_DATE + " TEXT," +
COLUMN_BOOKING_TIME + " TEXT," +
"FOREIGN KEY (" + COLUMN_PAT_ID + ") REFERENCES " + TABLE_NAME + "(" + COLUMN_PATIENT_ID + "), " +
//"FOREIGN KEY (DOCTOR_ID,CATEGORY) REFERENCES TABLE_NAME1 (Doctor_ID,Speciality)ON DELETE CASCADE" +
"FOREIGN KEY (" + COLUMN_DOC_ID + ") REFERENCES " + TABLE_NAME1 + "(" + COLUMN_DOCTOR_ID + ") ON DELETE CASCADE" +
")"
);
//db.setForeignKeyConstraintsEnabled(true); CANNOT SET HERE as onCreate is run within a transaction
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME);
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME1);
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME2);
}
public boolean insertData(String name, String lname, String gender, String username, String password, String email,
String pnum, String padd, String province) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_FNAME, name);
contentValues.put(COLUMN_LNAME, lname);
contentValues.put(COLUMN_GENDER, gender);
contentValues.put(COLUMN_USERNAME, username);
contentValues.put(COLUMN_PASSWORD, password);
contentValues.put(COLUMN_EMAIL, email);
contentValues.put(COLUMN_PADD, padd);
contentValues.put(COLUMN_PNUM, pnum);
contentValues.put(COLUMN_PROVINCE, province);
long rows = db.insertWithOnConflict(TABLE_NAME, null, contentValues, SQLiteDatabase.CONFLICT_REPLACE);
System.out.print(rows);
Log.d("User_cannot_to_dupliate", "" + rows);
long result0 = db.insert(TABLE_NAME, null, contentValues);
if (result0 == -1)
return false;
else
return true;
}
public boolean InsertData(String name1, String lname1, String gender1, String username1, String password1, String email1,
String padd1, String province1, String pnum1, String speciality1) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_FNAME1, name1);
contentValues.put(COLUMN_LNAME1, lname1);
contentValues.put(COLUMN_GENDER1, gender1);
contentValues.put(COLUMN_USERNAME1, username1);
contentValues.put(COLUMN_PASSWORD1, password1);
contentValues.put(COLUMN_EMAIL1, email1);
contentValues.put(COLUMN_PADD1, padd1);
contentValues.put(COLUMN_PROVINCE1, province1);
contentValues.put(COLUMN_PNUM1, pnum1);
contentValues.put(COLUMN_SPECIALITY, speciality1);
long rows = db.insertWithOnConflict(TABLE_NAME, null, contentValues, SQLiteDatabase.CONFLICT_REPLACE);
System.out.print(rows);
Log.d("User_cannot_to_dupliate", "" + rows);
long result = db.insert(TABLE_NAME1, null, contentValues);
if (result == -1)
return false;
else
return true;
}
public boolean UpdateData(String id, String name, String lname, String gender, String username, String password, String email,
String pnum, String padd, String province) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_PATIENT_ID, id);
contentValues.put(COLUMN_FNAME, name);
contentValues.put(COLUMN_LNAME, lname);
contentValues.put(COLUMN_GENDER, gender);
contentValues.put(COLUMN_USERNAME, username);
contentValues.put(COLUMN_PASSWORD, password);
contentValues.put(COLUMN_EMAIL, email);
contentValues.put(COLUMN_PADD, padd);
contentValues.put(COLUMN_PNUM, pnum);
contentValues.put(COLUMN_PROVINCE, province);
db.update(TABLE_NAME, contentValues, "ID= ?", new String[]{id});
return true;
}
public boolean UpdataData1(String id1, String name1, String lname1, String gender1, String username1, String password1, String email1,
String padd1, String province1, String pnum1, String speciality1) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_DOCTOR_ID, id1);
contentValues.put(COLUMN_FNAME1, name1);
contentValues.put(COLUMN_LNAME1, lname1);
contentValues.put(COLUMN_GENDER1, gender1);
contentValues.put(COLUMN_USERNAME1, username1);
contentValues.put(COLUMN_PASSWORD1, password1);
contentValues.put(COLUMN_EMAIL1, email1);
contentValues.put(COLUMN_PADD1, padd1);
contentValues.put(COLUMN_PROVINCE1, province1);
contentValues.put(COLUMN_PNUM1, pnum1);
contentValues.put(COLUMN_SPECIALITY, speciality1);
db.update(TABLE_NAME1, contentValues, "ID= ?", new String[]{id1});
return true;
}
public Integer DeleteData(String id) {
SQLiteDatabase db = this.getWritableDatabase();
return db.delete(TABLE_NAME, "ID = ?", new String[]{id});
}
}
备注
- 我认为没有必要因为使用
AUTOINCREMENT 而产生额外的开销，只需编码 INTEGER PRIMARY KEY 就足够了，所以我建议不要使用 AUTOINCREMENT。
- 我在整个 table 中使用了 CONSTANTS，并添加了那些被省略的列名，并修改了一些以符合标准约定。
- 已添加一些评论
因为数据库将存在，所以在重新运行应用程序之前，您必须执行以下 一个 :-
- Delete/Clear 应用程序的数据
- 卸载应用程序
- 增加数据库版本号
测试
以上代码已使用 中的 logDatabaseInfo 进行了测试，是否有任何方法可以帮助解决常见的 SQLite 问题？
.
结果输出为：-
04-07 14:00:12.617 1471-1471/soanswers.soanswers D/SQLITE_CSU: Database Version = 1
Table Name = android_metadata Created Using = CREATE TABLE android_metadata (locale TEXT)
Table = android_metadata ColumnName = locale ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table Name = Patient_Reg_table Created Using = CREATE TABLE Patient_Reg_table(PatientID INTEGER PRIMARY KEY AUTOINCREMENT, FName TEXT,LName TEXT,Gender TEXT,Username TEXT,Password TEXT,Email TEXT,PNum INTEGER,Postal_Address TEXT,Province TEXT)
Table = Patient_Reg_table ColumnName = PatientID ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 1
Table = Patient_Reg_table ColumnName = FName ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = LName ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
04-07 14:00:12.621 1471-1471/soanswers.soanswers D/SQLITE_CSU: Table = Patient_Reg_table ColumnName = Gender ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = Username ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = Password ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = Email ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = PNum ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = Postal_Address ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = Province ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table Name = sqlite_sequence Created Using = CREATE TABLE sqlite_sequence(name,seq)
Table = sqlite_sequence ColumnName = name ColumnType = Default Value = null PRIMARY KEY SEQUENCE = 0
Table = sqlite_sequence ColumnName = seq ColumnType = Default Value = null PRIMARY KEY SEQUENCE = 0
Table Name = Doctor_Reg_table Created Using = CREATE TABLE Doctor_Reg_table(Doctor_ID INTEGER PRIMARY KEY AUTOINCREMENT, F_Name TEXT,L_Name TEXT,Sex TEXT,Username_Doc TEXT,Password_Doc TEXT,Email_Doc TEXT,PNum_Doc INTEGER,Postal_Address_Doc TEXT,Province_Doc TEXT,Speciality TEXT)
Table = Doctor_Reg_table ColumnName = Doctor_ID ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 1
Table = Doctor_Reg_table ColumnName = F_Name ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = L_Name ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Sex ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Username_Doc ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Password_Doc ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Email_Doc ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = PNum_Doc ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Postal_Address_Doc ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Province_Doc ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Speciality ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table Name = Appointment_table Created Using = CREATE TABLE Appointment_table (Appoint_ID INTEGER PRIMARY KEY AUTOINCREMENT,Pat_ID INTEGER,Doc_ID INTEGER,B_date TEXT,B_time TEXT,FOREIGN KEY (Pat_ID) REFERENCES Patient_Reg_table(PatientID), FOREIGN KEY (Doc_ID) REFERENCES Doctor_Reg_table(Doctor_ID) ON DELETE CASCADE)
Table = Appointment_table ColumnName = Appoint_ID ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 1
Table = Appointment_table ColumnName = Pat_ID ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Appointment_table ColumnName = Doc_ID ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Appointment_table ColumnName = B_date ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
04-07 14:00:12.625 1471-1471/soanswers.soanswers D/SQLITE_CSU: Table = Appointment_table ColumnName = B_time ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
当我 运行 没有 table 的应用程序 created.I 试图打开外键属性的实现但它没有工作。如果有另一种方法，那将非常 helpful.This 是项目的所有代码，我正在尝试进行患者预约安排 System.So 我正在尝试在我的预约中实现外键 table 如下所示。 DatabaseHelper.java
public class DatabaseHelper extends SQLiteOpenHelper {
//columns for the Patient table
public static final String TABLE_NAME = "Patient_Reg_table";
public static final String COLUMN_PATIENT_ID= "PatientID";
public static final String COLUMN_FNAME= "FName";
public static final String COLUMN_LNAME = "LName";
public static final String COLUMN_GENDER= "Gender";
public static final String COLUMN_USERNAME = "Username";
public static final String COLUMN_PASSWORD = "Password";
public static final String COLUMN_EMAIL = "Email";
public static final String COLUMN_PNUM= "PNum";
public static final String COLUMN_PADD = "Postal_Address";
public static final String COLUMN_PROVINCE= "Province";
//column for the Doctor Table
public static final String TABLE_NAME1 = "Doctor_Reg_table";
public static final String COLUMN_DOCTOR_ID= "Doctor_ID";
public static final String COLUMN_FNAME1= "F_Name";
public static final String COLUMN_LNAME1 = "L_Name";
public static final String COLUMN_GENDER1= "Sex";
public static final String COLUMN_USERNAME1 = "Username_Doc";
public static final String COLUMN_PASSWORD1 = "Password_Doc";
public static final String COLUMN_EMAIL1 = "Email_Doc";
public static final String COLUMN_PNUM1= "PNum_Doc";
public static final String COLUMN_PADD1 = "Postal_Address_Doc";
public static final String COLUMN_PROVINCE1= "Province_Doc";
public static final String COLUMN_SPECIALITY= "Speciality";
//column for the Appointment-Booking table
public static final String TABLE_NAME2= "Appointment_table";
public static final String Appointment_ID = "Appoint_ID";
public static final String Booking_Date = "B_date";
public static final String Pat_ID="Pat_ID";
public static final String Doc_ID="Doc_ID";
public static final String Booking_TimeSlot = "B_time";
public static final String Speciality1 = "Speciality1";
//SQL statement for creation of a database
public static final String DATABASE_NAME="hit200.db";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
SQLiteDatabase db = this.getWritableDatabase();
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(" CREATE TABLE " + TABLE_NAME + " (PatientID INTEGER PRIMARY KEY AUTOINCREMENT, FName TEXT , LName TEXT , Gender, Username TEXT , Password TEXT , Email TEXT , PNum INTEGER , Postal_Address TEXT , Province)");
db.execSQL(" CREATE TABLE " + TABLE_NAME1 + " ( Doctor_ID INTEGER PRIMARY KEY AUTOINCREMENT, F_Name TEXT , L_Name TEXT , Sex TEXT , Username_Doc TEXT , Password_Doc TEXT , Email_Doc TEXT , PNum_Doc INTEGER ,Postal_Address_Doc TEXT , Province_Doc TEXT , Speciality TEXT ) ");
db.execSQL(" CREATE TABLE " + TABLE_NAME2 + " (Appoint_ID INTEGER PRIMARY KEY AUTOINCREMENT, b_date date, b_time date, FOREIGN KEY (PATIENT_ID) REFERENCES TABLE_NAME(PatientID), FOREIGN KEY (DOCTOR_ID,CATEGORY) REFERENCES TABLE_NAME1 (Doctor_ID,Speciality)ON DELETE CASCADE)");
db.setForeignKeyConstraintsEnabled(true);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME);
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME1);
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME2);
}
public boolean insertData(String name, String lname, String gender , String username, String password, String email,
String pnum, String padd, String province)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_FNAME,name);
contentValues.put(COLUMN_LNAME,lname);
contentValues.put(COLUMN_GENDER,gender);
contentValues.put(COLUMN_USERNAME,username);
contentValues.put(COLUMN_PASSWORD,password);
contentValues.put(COLUMN_EMAIL,email);
contentValues.put(COLUMN_PADD,padd);
contentValues.put(COLUMN_PNUM,pnum);
contentValues.put(COLUMN_PROVINCE,province);
long rows=db.insertWithOnConflict(TABLE_NAME, null, contentValues,SQLiteDatabase.CONFLICT_REPLACE);
System.out.print(rows);
Log.d("User_cannot_to_dupliate",""+ rows);
long result0= db.insert(TABLE_NAME,null,contentValues);
if(result0 == -1)
return false;
else
return true;
}
public boolean InsertData(String name1, String lname1, String gender1 , String username1, String password1, String email1,
String padd1, String province1,String pnum1,String speciality1)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_FNAME1,name1);
contentValues.put(COLUMN_LNAME1,lname1);
contentValues.put(COLUMN_GENDER1,gender1);
contentValues.put(COLUMN_USERNAME1,username1);
contentValues.put(COLUMN_PASSWORD1,password1);
contentValues.put(COLUMN_EMAIL1,email1);
contentValues.put(COLUMN_PADD1,padd1);
contentValues.put(COLUMN_PROVINCE1,province1);
contentValues.put(COLUMN_PNUM1,pnum1);
contentValues.put(COLUMN_SPECIALITY,speciality1);
long rows=db.insertWithOnConflict(TABLE_NAME, null, contentValues,SQLiteDatabase.CONFLICT_REPLACE);
System.out.print(rows);
Log.d("User_cannot_to_dupliate",""+ rows);
long result= db.insert(TABLE_NAME1,null,contentValues);
if(result == -1)
return false;
else
return true;
}
public boolean UpdateData(String id,String name, String lname, String gender , String username, String password, String email,
String pnum, String padd, String province)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_PATIENT_ID,id);
contentValues.put(COLUMN_FNAME,name);
contentValues.put(COLUMN_LNAME,lname);
contentValues.put(COLUMN_GENDER,gender);
contentValues.put(COLUMN_USERNAME,username);
contentValues.put(COLUMN_PASSWORD,password);
contentValues.put(COLUMN_EMAIL,email);
contentValues.put(COLUMN_PADD,padd);
contentValues.put(COLUMN_PNUM,pnum);
contentValues.put(COLUMN_PROVINCE,province);
db.update(TABLE_NAME ,contentValues,"ID= ?", new String []{id});
return true;
}
public boolean UpdataData1(String id1,String name1, String lname1, String gender1 , String username1, String password1, String email1,
String padd1, String province1,String pnum1,String speciality1)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_DOCTOR_ID,id1);
contentValues.put(COLUMN_FNAME1,name1);
contentValues.put(COLUMN_LNAME1,lname1);
contentValues.put(COLUMN_GENDER1,gender1);
contentValues.put(COLUMN_USERNAME1,username1);
contentValues.put(COLUMN_PASSWORD1,password1);
contentValues.put(COLUMN_EMAIL1,email1);
contentValues.put(COLUMN_PADD1,padd1);
contentValues.put(COLUMN_PROVINCE1,province1);
contentValues.put(COLUMN_PNUM1,pnum1);
contentValues.put(COLUMN_SPECIALITY,speciality1);
db.update(TABLE_NAME1 ,contentValues,"ID= ?", new String []{id1});
return true;
}
public Integer DeleteData(String id)
{
SQLiteDatabase db=this.getWritableDatabase();
return db.delete(TABLE_NAME, "ID = ?",new String[] {id});
}
}
有几个问题，第一个是外键问题。您是说约束应该应用于列 PATIENT_ID，但尚未在 Appointment_table 中定义这样的列].
logcat 会包含一个堆栈跟踪，表明列 PATIENT_ID 不存在。
修复会导致错误，指出 TABLE_NAME 不存在，因为您已包含 TABLE_NAME 在引号内，因此按字面意思。
第二个外键也有类似的错误。然而，当您尝试使用 a 时，似乎是一个不必要的复合外键。 DOCTOR_ID 或 CATEGORY 列均未定义，TABLE_NAME1被视为文字，因为它包含在引号内。不需要复合列（CATEGORY 和 SPECIALITY），因为 DOCTOR_ID 中的 Doctor_Reg_table 唯一标识关系.另外包括 CATEGORY/SPECIALITY 会出现问题，因为不满足 FOREIGN KEYS 的索引要求。
最后，您不能在 onCreate 中使用 setForeignKeyConstraintsEnabled(true)，因为它在交易中 运行。您可以覆盖 onConFigure 方法：-
onConfigure added in API level 16 void onConfigure (SQLiteDatabase db) Called when the database connection is being configured, to enable features such as write-ahead logging or foreign key support.
This method is called before onCreate(SQLiteDatabase), onUpgrade(SQLiteDatabase, int, int), onDowngrade(SQLiteDatabase, int, int), or onOpen(SQLiteDatabase) are called. It should not modify the database except to configure the database connection as required.
This method should only call methods that configure the parameters of the database connection, such as enableWriteAheadLogging() setForeignKeyConstraintsEnabled(boolean), setLocale(Locale), setMaximumSize(long), or executing PRAGMA statements. onConfigure
以下代码有效，可能是您想要的：-
public class DatabaseHelper extends SQLiteOpenHelper {
//columns for the Patient table
public static final String TABLE_NAME = "Patient_Reg_table";
public static final String COLUMN_PATIENT_ID = "PatientID";
public static final String COLUMN_FNAME = "FName";
public static final String COLUMN_LNAME = "LName";
public static final String COLUMN_GENDER = "Gender";
public static final String COLUMN_USERNAME = "Username";
public static final String COLUMN_PASSWORD = "Password";
public static final String COLUMN_EMAIL = "Email";
public static final String COLUMN_PNUM = "PNum";
public static final String COLUMN_PADD = "Postal_Address";
public static final String COLUMN_PROVINCE = "Province";
//column for the Doctor Table
public static final String TABLE_NAME1 = "Doctor_Reg_table";
public static final String COLUMN_DOCTOR_ID = "Doctor_ID";
public static final String COLUMN_FNAME1 = "F_Name";
public static final String COLUMN_LNAME1 = "L_Name";
public static final String COLUMN_GENDER1 = "Sex";
public static final String COLUMN_USERNAME1 = "Username_Doc";
public static final String COLUMN_PASSWORD1 = "Password_Doc";
public static final String COLUMN_EMAIL1 = "Email_Doc";
public static final String COLUMN_PNUM1 = "PNum_Doc";
public static final String COLUMN_PADD1 = "Postal_Address_Doc";
public static final String COLUMN_PROVINCE1 = "Province_Doc";
public static final String COLUMN_SPECIALITY = "Speciality";
//column for the Appointment-Booking table
public static final String TABLE_NAME2 = "Appointment_table";
public static final String COLUMN_APPOINTMENT_ID = "Appoint_ID";
public static final String COLUMN_BOOKING_DATE = "B_date";
public static final String COLUMN_BOOKING_TIME = "B_time";
public static final String COLUMN_PAT_ID = "Pat_ID";
public static final String COLUMN_DOC_ID = "Doc_ID";
public static final String COLUMN_BOOKING_TIMESLOT = "B_time";
public static final String COLUMN_SPECIALITY1 = "Speciality1";
//SQL statement for creation of a database
public static final String DATABASE_NAME = "hit200.db";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
SQLiteDatabase db = this.getWritableDatabase();
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(" CREATE TABLE " + TABLE_NAME + "(" +
COLUMN_PATIENT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COLUMN_FNAME + " TEXT," +
COLUMN_LNAME + " TEXT," +
COLUMN_GENDER + " TEXT," +
COLUMN_USERNAME + " TEXT," +
COLUMN_PASSWORD + " TEXT," +
COLUMN_EMAIL + " TEXT," +
COLUMN_PNUM + " INTEGER," +
COLUMN_PADD + " TEXT," +
COLUMN_PROVINCE + " TEXT" +
")"
);
db.execSQL(" CREATE TABLE " + TABLE_NAME1 + "(" +
COLUMN_DOCTOR_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COLUMN_FNAME1 + " TEXT," +
COLUMN_LNAME1 + " TEXT," +
COLUMN_GENDER1 + " TEXT," +
COLUMN_USERNAME1 + " TEXT," +
COLUMN_PASSWORD1 + " TEXT," +
COLUMN_EMAIL1 + " TEXT," +
COLUMN_PNUM1 + " INTEGER," +
COLUMN_PADD1 + " TEXT," +
COLUMN_PROVINCE1 + " TEXT," +
COLUMN_SPECIALITY + " TEXT" +
")"
);
db.execSQL(" CREATE TABLE " + TABLE_NAME2 + " (" +
COLUMN_APPOINTMENT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
COLUMN_PAT_ID + " INTEGER," + //<<<< NOT NULL ADVISABLE
COLUMN_DOC_ID + " INTEGER," + //<<<< NOt NULL ADVISABLE
COLUMN_BOOKING_DATE + " TEXT," +
COLUMN_BOOKING_TIME + " TEXT," +
"FOREIGN KEY (" + COLUMN_PAT_ID + ") REFERENCES " + TABLE_NAME + "(" + COLUMN_PATIENT_ID + "), " +
//"FOREIGN KEY (DOCTOR_ID,CATEGORY) REFERENCES TABLE_NAME1 (Doctor_ID,Speciality)ON DELETE CASCADE" +
"FOREIGN KEY (" + COLUMN_DOC_ID + ") REFERENCES " + TABLE_NAME1 + "(" + COLUMN_DOCTOR_ID + ") ON DELETE CASCADE" +
")"
);
//db.setForeignKeyConstraintsEnabled(true); CANNOT SET HERE as onCreate is run within a transaction
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME);
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME1);
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME2);
}
public boolean insertData(String name, String lname, String gender, String username, String password, String email,
String pnum, String padd, String province) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_FNAME, name);
contentValues.put(COLUMN_LNAME, lname);
contentValues.put(COLUMN_GENDER, gender);
contentValues.put(COLUMN_USERNAME, username);
contentValues.put(COLUMN_PASSWORD, password);
contentValues.put(COLUMN_EMAIL, email);
contentValues.put(COLUMN_PADD, padd);
contentValues.put(COLUMN_PNUM, pnum);
contentValues.put(COLUMN_PROVINCE, province);
long rows = db.insertWithOnConflict(TABLE_NAME, null, contentValues, SQLiteDatabase.CONFLICT_REPLACE);
System.out.print(rows);
Log.d("User_cannot_to_dupliate", "" + rows);
long result0 = db.insert(TABLE_NAME, null, contentValues);
if (result0 == -1)
return false;
else
return true;
}
public boolean InsertData(String name1, String lname1, String gender1, String username1, String password1, String email1,
String padd1, String province1, String pnum1, String speciality1) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_FNAME1, name1);
contentValues.put(COLUMN_LNAME1, lname1);
contentValues.put(COLUMN_GENDER1, gender1);
contentValues.put(COLUMN_USERNAME1, username1);
contentValues.put(COLUMN_PASSWORD1, password1);
contentValues.put(COLUMN_EMAIL1, email1);
contentValues.put(COLUMN_PADD1, padd1);
contentValues.put(COLUMN_PROVINCE1, province1);
contentValues.put(COLUMN_PNUM1, pnum1);
contentValues.put(COLUMN_SPECIALITY, speciality1);
long rows = db.insertWithOnConflict(TABLE_NAME, null, contentValues, SQLiteDatabase.CONFLICT_REPLACE);
System.out.print(rows);
Log.d("User_cannot_to_dupliate", "" + rows);
long result = db.insert(TABLE_NAME1, null, contentValues);
if (result == -1)
return false;
else
return true;
}
public boolean UpdateData(String id, String name, String lname, String gender, String username, String password, String email,
String pnum, String padd, String province) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_PATIENT_ID, id);
contentValues.put(COLUMN_FNAME, name);
contentValues.put(COLUMN_LNAME, lname);
contentValues.put(COLUMN_GENDER, gender);
contentValues.put(COLUMN_USERNAME, username);
contentValues.put(COLUMN_PASSWORD, password);
contentValues.put(COLUMN_EMAIL, email);
contentValues.put(COLUMN_PADD, padd);
contentValues.put(COLUMN_PNUM, pnum);
contentValues.put(COLUMN_PROVINCE, province);
db.update(TABLE_NAME, contentValues, "ID= ?", new String[]{id});
return true;
}
public boolean UpdataData1(String id1, String name1, String lname1, String gender1, String username1, String password1, String email1,
String padd1, String province1, String pnum1, String speciality1) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_DOCTOR_ID, id1);
contentValues.put(COLUMN_FNAME1, name1);
contentValues.put(COLUMN_LNAME1, lname1);
contentValues.put(COLUMN_GENDER1, gender1);
contentValues.put(COLUMN_USERNAME1, username1);
contentValues.put(COLUMN_PASSWORD1, password1);
contentValues.put(COLUMN_EMAIL1, email1);
contentValues.put(COLUMN_PADD1, padd1);
contentValues.put(COLUMN_PROVINCE1, province1);
contentValues.put(COLUMN_PNUM1, pnum1);
contentValues.put(COLUMN_SPECIALITY, speciality1);
db.update(TABLE_NAME1, contentValues, "ID= ?", new String[]{id1});
return true;
}
public Integer DeleteData(String id) {
SQLiteDatabase db = this.getWritableDatabase();
return db.delete(TABLE_NAME, "ID = ?", new String[]{id});
}
}
备注
- 我认为没有必要因为使用
AUTOINCREMENT而产生额外的开销，只需编码INTEGER PRIMARY KEY就足够了，所以我建议不要使用AUTOINCREMENT。 - 我在整个 table 中使用了 CONSTANTS，并添加了那些被省略的列名，并修改了一些以符合标准约定。
- 已添加一些评论
因为数据库将存在，所以在重新运行应用程序之前，您必须执行以下 一个 :-
- Delete/Clear 应用程序的数据
- 卸载应用程序
- 增加数据库版本号
测试
以上代码已使用 中的 logDatabaseInfo 进行了测试，是否有任何方法可以帮助解决常见的 SQLite 问题？
.
结果输出为：-
04-07 14:00:12.617 1471-1471/soanswers.soanswers D/SQLITE_CSU: Database Version = 1
Table Name = android_metadata Created Using = CREATE TABLE android_metadata (locale TEXT)
Table = android_metadata ColumnName = locale ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table Name = Patient_Reg_table Created Using = CREATE TABLE Patient_Reg_table(PatientID INTEGER PRIMARY KEY AUTOINCREMENT, FName TEXT,LName TEXT,Gender TEXT,Username TEXT,Password TEXT,Email TEXT,PNum INTEGER,Postal_Address TEXT,Province TEXT)
Table = Patient_Reg_table ColumnName = PatientID ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 1
Table = Patient_Reg_table ColumnName = FName ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = LName ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
04-07 14:00:12.621 1471-1471/soanswers.soanswers D/SQLITE_CSU: Table = Patient_Reg_table ColumnName = Gender ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = Username ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = Password ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = Email ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = PNum ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = Postal_Address ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Patient_Reg_table ColumnName = Province ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table Name = sqlite_sequence Created Using = CREATE TABLE sqlite_sequence(name,seq)
Table = sqlite_sequence ColumnName = name ColumnType = Default Value = null PRIMARY KEY SEQUENCE = 0
Table = sqlite_sequence ColumnName = seq ColumnType = Default Value = null PRIMARY KEY SEQUENCE = 0
Table Name = Doctor_Reg_table Created Using = CREATE TABLE Doctor_Reg_table(Doctor_ID INTEGER PRIMARY KEY AUTOINCREMENT, F_Name TEXT,L_Name TEXT,Sex TEXT,Username_Doc TEXT,Password_Doc TEXT,Email_Doc TEXT,PNum_Doc INTEGER,Postal_Address_Doc TEXT,Province_Doc TEXT,Speciality TEXT)
Table = Doctor_Reg_table ColumnName = Doctor_ID ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 1
Table = Doctor_Reg_table ColumnName = F_Name ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = L_Name ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Sex ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Username_Doc ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Password_Doc ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Email_Doc ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = PNum_Doc ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Postal_Address_Doc ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Province_Doc ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Doctor_Reg_table ColumnName = Speciality ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
Table Name = Appointment_table Created Using = CREATE TABLE Appointment_table (Appoint_ID INTEGER PRIMARY KEY AUTOINCREMENT,Pat_ID INTEGER,Doc_ID INTEGER,B_date TEXT,B_time TEXT,FOREIGN KEY (Pat_ID) REFERENCES Patient_Reg_table(PatientID), FOREIGN KEY (Doc_ID) REFERENCES Doctor_Reg_table(Doctor_ID) ON DELETE CASCADE)
Table = Appointment_table ColumnName = Appoint_ID ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 1
Table = Appointment_table ColumnName = Pat_ID ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Appointment_table ColumnName = Doc_ID ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 0
Table = Appointment_table ColumnName = B_date ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
04-07 14:00:12.625 1471-1471/soanswers.soanswers D/SQLITE_CSU: Table = Appointment_table ColumnName = B_time ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0