如何限制sqlite查询？答案

【问题标题】：How to limit in sqllite query?如何限制sqlite查询？
【发布时间】：2018-06-14 11:42:29
【问题描述】：

 public String readQuestion(int i)//Used to read the data from the Des.db file where id is given and we choose id randomly
{
    String Ans = "";//string that contains the required field  note that Ans is just a local string not related to Answer or Option...
    Cursor c = sqlite.rawQuery("SELECT " + Question + " FROM " + Table_name + " LIMIT " + 5 + " WHERE " + uid + " = " + i + "", null);//cursor to that query
    if (c.moveToFirst())
        Ans = c.getString(0);
    else
        Ans = "";
    return Ans;
}

我想在这个查询中添加一个限制。像 LIMIT 10。

【问题讨论】：

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标签： android sql sqlite

【解决方案1】：

你已经接近了。 LIMIT 关键字需要位于查询的结尾。您目前拥有的位置：

"SELECT " + Question + 
" FROM " + Table_name + 
" LIMIT " + 5 + 
" WHERE " + uid + " = " + i + ""

这应该是

"SELECT " + Question + 
" FROM " + Table_name + + 
" WHERE " + uid + " = " + i +
" LIMIT " + 5 + ""

【讨论】：

【解决方案2】：

Cursor c = sqlite.rawQuery("SELECT " + Question + " FROM " + Table_name + " WHERE " + uid + " = " + i + " LIMIT 5 ", null);

限制在查询的末尾。您应该查看链接以获取详细信息。 sqlite limit statement

【讨论】：

Cursor c = sqlite.rawQuery("SELECT " + Question + " FROM " + Table_name + " WHERE " + uid + " = " + i + " LIMIT 5 " , null);//cursor到那个查询什么都没有发生。

【解决方案3】：

请考虑零钱。

Cursor c = sqlite.rawQuery("SELECT " + Question + " FROM " + Table_name  
           + " WHERE  " + uid + " = " + i  + " LIMIT " + "5", null);

【讨论】：