Android 如何使用 ORMLite 查询生成器获取表中的总记录数
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How to use the ORMLite query builder to get the total records in a table
提问by Sourabh Saldi
Similar to
相似
select count(*) from tablename;
what should be query in ORMLITE
在 ORMLITE 中应该查询什么
i tried something like
我试过类似的东西
int total = dao.queryBuilder().("select count(*)");
回答by Gray
How to use the ORMLite query builder to get the total records in a table
如何使用 ORMLite 查询生成器获取表中的总记录数
ORMLitehas a Dao.countOf()method that returns the total number of rows in a table:
ORMLite有一个Dao.countOf()方法可以返回表中的总行数：
long numRows = dao.countOf();
You can also count the number of rows in a custom queryby calling the countOf()method on the Whereor QueryBuilderobject.
您还可以通过调用or对象上的方法来计算自定义查询中的行数。countOf()WhereQueryBuilder
// count the number of lines in this custom query
long numRows = dao.queryBuilder().where().eq("name", "Joe Smith").countOf();
回答by PoeHaH
for package 5: you can use countOf()
对于包 5：您可以使用 countOf()
From the docs:
从文档：
Returns the value returned from a SELECT COUNT(*) query which is the number of rows in the table. Depending on the database and the size of the table, this could be expensive.
返回从 SELECT COUNT(*) 查询返回的值，即表中的行数。根据数据库和表的大小，这可能很昂贵。
