Java 创建唯一复合列的语法-Android SQLiteOpenHelper
在我的Java 创建唯一复合列的语法-Android SQLiteOpenHelper,java,android,sqlite,sqliteopenhelper,Java,Android,Sqlite,Sqliteopenhelper,在我的SQLiteOpenHelper 类,我想在这两列(复合唯一列)上添加唯一约束: SongContract.SongEntry.COLUMN\u TITLE SongContract.SongEntry.COLUMN\u RELEASEDATE 但我得到了一个错误: 无法解析唯一的方法 这是我的密码: public void onCreate(SQLiteDatabase db) { final String SQL_CREATE_SONG_TABLE = "CREATE TA
SQLiteOpenHelper
类,我想在这两列(复合唯一列)上添加唯一约束:
SongContract.SongEntry.COLUMN\u TITLE
SongContract.SongEntry.COLUMN\u RELEASEDATE
public void onCreate(SQLiteDatabase db) {
final String SQL_CREATE_SONG_TABLE = "CREATE TABLE " + SongContract.SongEntry.TABLE_SONG + " (" +
SongContract.SongEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
SongContract.SongEntry.COLUMN_TITLE + " TEXT NOT NULL, " +
SongContract.SongEntry.COLUMN_RELEASEDATE + " INTEGER, " +
UNIQUE(SongContract.SongEntry.COLUMN_TITLE, SongContract.SongEntry.COLUMN_RELEASEDATE) +
SongContract.SongEntry.COLUMN_RATING + " TEXT);";
db.execSQL(SQL_CREATE_SONG_TABLE);
}
实现我的目标的正确语法是什么?在使用sqllite之后,我找到了正确的语法: 最后一个字符串SQL_CREATE_SONG_TABLE=“CREATE TABLE”+SongContract.SongEntry.TABLE_SONG+”(“+ SongContract.SongEntry.\u ID+“整型主键自动递增,”+ SongContract.SongEntry.COLUMN_TITLE+“文本不为空,”+ SongContract.SongEntry.COLUMN_RELEASEDATE+“整数不为空,”+ SongContract.SongEntry.COLUMN_分级+“文本,+”唯一“+”(“+
SongContract.SongEntry.COLUMN_TITLE+”,“+SongContract.SongEntry.COLUMN_RELEASEDATE+”,“+” 在玩了sqllite之后,我找到了正确的语法: 最后一个字符串SQL_CREATE_SONG_TABLE=“CREATE TABLE”+SongContract.SongEntry.TABLE_SONG+”(“+ SongContract.SongEntry.\u ID+“整型主键自动递增,”+ SongContract.SongEntry.COLUMN_TITLE+“文本不为空,”+ SongContract.SongEntry.COLUMN_RELEASEDATE+“整数不为空,”+ SongContract.SongEntry.COLUMN_分级+“文本,+”唯一“+”(“+ SongContract.SongEntry.COLUMN_TITLE+”,“+SongContract.SongEntry.COLUMN_RELEASEDATE+”,“+”