sqlite3在android中创建表错误(sqlite3 create table error in android)

我试图在android中使用sqlite3创建表我的开放助手是这样的：

public class TaskOpenHelper extends BaseOpenHelper {

public static final String TABLE_NAME = "tasks";

public static final String COL_ID = "id";

public static final String COL_USER_ID = "user_id";

public static final String COL_TITLE = "title";

public static final String COL_DATE = "date";

public static final String COL_TIME = "time";

public static final String COL_IS_DONE = "is_done";

public static final String COL_IS_IPM = "is_ipm";

public static final String COL_DESC = "desc";

public static final String COL_REGISTER_TIME = "register_time";

public static final String CREATE_TABLE = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME +

"(" +

COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +

COL_USER_ID + " INTEGER NOT NULL," +

COL_TITLE + " TEXT NOT NULL," +

COL_DATE + " TEXT ," +

COL_TIME + " TEXT ," +

COL_IS_DONE + " INTEGER ," +

COL_IS_IPM + " INTEGER ," +

COL_DESC + " TEXT," +

COL_REGISTER_TIME + " TEXT," +

"FOREIGN KEY " + COL_USER_ID + " REFERENCES " + UserOpenHelper.TABLE_NAME + "(" + UserOpenHelper.COL_ID + ")" +

");";

public TaskOpenHelper(Context context) {

super(context, DATABASE_NAME, null, VERSION);

}

@Override

public void onCreate(SQLiteDatabase sqLiteDatabase) {

sqLiteDatabase.execSQL(CREATE_TABLE);

}

@Override

public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);

onCreate(sqLiteDatabase);

}

但是当我在尝试创建表时运行app时，这个错误得到了证实：

Caused by: android.database.sqlite.SQLiteException: near "user_id": syntax error (code 1): , while compiling: CREATE TABLE IF NOT EXISTS tasks(id INTEGER PRIMARY KEY AUTOINCREMENT,user_id INTEGER NOT NULL,title TEXT NOT NULL,date TEXT ,time TEXT ,is_done INTEGER ,is_ipm INTEGER ,desc TEXT,register_time TEXT,FOREIGN KEY user_id REFERENCES user(Id));

这个open helper在数据源类中用于执行db的查询

I am trying to create table in android using sqlite3 my open helper is this:

public class TaskOpenHelper extends BaseOpenHelper {

public static final String TABLE_NAME = "tasks";

public static final String COL_ID = "id";

public static final String COL_USER_ID = "user_id";

public static final String COL_TITLE = "title";

public static final String COL_DATE = "date";

public static final String COL_TIME = "time";

public static final String COL_IS_DONE = "is_done";

public static final String COL_IS_IPM = "is_ipm";

public static final String COL_DESC = "desc";

public static final String COL_REGISTER_TIME = "register_time";

public static final String CREATE_TABLE = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME +

"(" +

COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +

COL_USER_ID + " INTEGER NOT NULL," +

COL_TITLE + " TEXT NOT NULL," +

COL_DATE + " TEXT ," +

COL_TIME + " TEXT ," +

COL_IS_DONE + " INTEGER ," +

COL_IS_IPM + " INTEGER ," +

COL_DESC + " TEXT," +

COL_REGISTER_TIME + " TEXT," +

"FOREIGN KEY " + COL_USER_ID + " REFERENCES " + UserOpenHelper.TABLE_NAME + "(" + UserOpenHelper.COL_ID + ")" +

");";

public TaskOpenHelper(Context context) {

super(context, DATABASE_NAME, null, VERSION);

}

@Override

public void onCreate(SQLiteDatabase sqLiteDatabase) {

sqLiteDatabase.execSQL(CREATE_TABLE);

}

@Override

public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);

onCreate(sqLiteDatabase);

}

but when I run app when trying to create table this error accured:

Caused by: android.database.sqlite.SQLiteException: near "user_id": syntax error (code 1): , while compiling: CREATE TABLE IF NOT EXISTS tasks(id INTEGER PRIMARY KEY AUTOINCREMENT,user_id INTEGER NOT NULL,title TEXT NOT NULL,date TEXT ,time TEXT ,is_done INTEGER ,is_ipm INTEGER ,desc TEXT,register_time TEXT,FOREIGN KEY user_id REFERENCES user(Id));

this open helper is used in a datasource class to executre querys from db

原文：https://stackoverflow.com/questions/32017910

更新时间：2019-06-16 07:52

最满意答案

您需要将user_id放在FOREIGN KEY子句的括号中：

FOREIGN KEY (user_id) REFERENCES user(Id)

整个陈述应该是这样的

CREATE TABLE IF NOT EXISTS tasks(id INTEGER PRIMARY KEY AUTOINCREMENT,

user_id INTEGER NOT NULL,

title TEXT NOT NULL,

date TEXT,

time TEXT,

is_done INTEGER,

is_ipm INTEGER,

desc TEXT,

register_time TEXT,

FOREIGN KEY user_id REFERENCES user(Id));

此外，您必须更改desc列的名称，因为这是SQLite中的保留字 。

You need to put user_id in parentheses in the FOREIGN KEY clause:

FOREIGN KEY (user_id) REFERENCES user(Id)

The entire statement should look like

CREATE TABLE IF NOT EXISTS tasks(id INTEGER PRIMARY KEY AUTOINCREMENT,

user_id INTEGER NOT NULL,

title TEXT NOT NULL,

date TEXT,

time TEXT,

is_done INTEGER,

is_ipm INTEGER,

desc TEXT,

register_time TEXT,

FOREIGN KEY user_id REFERENCES user(Id));

Also you must change the name of the desc column as this is a reserved word in SQLite.

2015-08-14

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user_id INTEGER NOT NULL,

title TEXT NOT NULL,

date TEXT,

time TEXT,

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