Question

我有一个表创建，但我希望该组的名称是唯一的（为了防止重复）我该怎么做？这是我的查询创建。

db.execSQL("CREATE TABLE "+ tablemachine+" ("+
                idMaquina +" INTEGER PRIMARY KEY AUTOINCREMENT, "
                + name+ " text not null, " //I want this field unique
              ....

Answer 1

Just add "UNIQUE" like that

"CREATE TABLE "+ tablemachine+" ("+idMaquina +" INTEGER PRIMARY KEY AUTOINCREMENT, "
+ name+ " TEXT NOT NULL UNIQUE, " //I want this field unique

Answer 2

您可以在列的末尾添加UNIQUE

`"CREATE TABLE "+ tablemachine+" ("+idMaquina +" INTEGER PRIMARY KEY 
AUTOINCREMENT, "
+ name+ " TEXT NOT NULL UNIQUE, " //I want this field unique`

或添加约束，您的SQL应该如下所示

db.execSQL("CREATE TABLE "+ tablemachine+" ("+
        idMaquina +" INTEGER PRIMARY KEY AUTOINCREMENT, "
        + name+ " text not null, constraint table_name_constraint unique 
(name)) "

如何在MySqlite中创建一个UNIQUE字段？

2 个答案: