Question

我希望能够使用android在sqlite中添加数据。列Id应该具有主键，并且应该是自动增量字段。并且状态的默认值应为0.不确定这是否为sqlite执行此操作。

public static  final String DATABASE_NAME="tododata";       
public static  final String TABLE_NAME="todolist";       
public static  final int KEY_ID= 0;               
public static  final String KEY_TITLE="Title";                 
public static final String KEY_DESCRIPTION="Description";
// public static final Date KEY_DATE = ;
public static final int KEY_STATUS = 0;

public static  final int DATABASE_VERSON=1;           

public DataHandler(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSON);
}

@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL("create table "+TABLE_NAME+"(Id integer primary key not null autoincrement 1 , title text not null, description text not null, date date not null, status int default 0);");
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL("drop table if exists "+TABLE_NAME);
}

Answer 1

这应该是正确的语法：

CREATE TABLE table_name (Id INTEGER PRIMARY KEY AUTOINCREMENT, title TEXT NOT NULL, description TEXT NOT NULL, date DATE NOT NULL, status INTEGER DEFAULT 0)

Answer 2

您的查询应该采用以下格式： -

sqliteDatabase.execSQL("create table tableName ("+COL1_NAME+" integer primary key  autoincrement, "+COL2_NAME+" text , "+COL3_NAME+" text , "+COL4_NAME+" text)");

Android中的Sqlite查询，用于自动增量和默认值

2 个答案: