database-cursor

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Cursor size limit in Android SQLiteDatabase

I download a db from internet. I save it in my datases folder and I open it. Inside the db there is a table \"Ads\" with 6 fields. 2 of these fields are BLOB. When I want to read from this table... I[详细]

2023-02-19 19:15 分类：问答
SQL Cursor Query or Two Separate Queries: Which Would Be More Efficient?

I\'m working on trying to make a bit of code dealing with a message tree in PHP more efficient. The data is stored in a SQL database, and at present has to do 2 SQL queries per message, one to find th[详细]

2023-02-19 02:10 分类：问答
How can I reduce the impact of a long-running i/o-intensive query in PostgreSQL?

This post suggests I can use a cursor to fetch from a query at a throttled rate. How do I do this? 开发者_JAVA百科My aim is to reduce the impact of this low-priority query on other higher-priority que[详细]

2023-02-18 21:55 分类：问答
SQL to produce matches from a data table and a pattern table

Given a data table with columns id, color, size and a second table with rules/patterns so rule_id, color_condition and size_condition.[详细]

2023-02-15 15:12 分类：问答
Trouble understanding Database Cursors

With most drivers for most relational databases, the default and preferred way to access results is to use a cursor or iterator.[详细]

2023-02-11 14:27 分类：问答
Access cursor by column name dynamically

Can I access a cursor\'s column dynamically? I mean by name? something like this: declare v_cursor := select * from emp;[详细]

2023-02-09 19:10 分类：问答
How to find number of rows in cursor

I wo开发者_开发技巧uld like to find the number of rows in a cursor. Is there a keyword that can help? Using COUNT, we have to write a query. Any help will be greatly appreciated.The cursor_variable.%R[详细]

2023-02-09 12:10 分类：问答
Conditionally define a Cursor

I have a Procedure in Oracle that takes a varchar2 paramater.Based on the value of that parameter, I need to define a cursor.The cursor will operate on different tables based on the value of the param[详细]

2023-02-07 18:12 分类：问答
How to use cursor() for pagination?

Can anyone point me to a practical application of cursor() to do pagination? I am not clear how to use cursor() as given in the documentation.[详细]

2023-02-07 05:57 分类：问答
Nested queries using MySQLdb

I am trying to achieve the following using Py开发者_运维问答thon and the MySQLdb interface: Read the contents of a table that has a few million rows.[详细]

2023-02-07 00:32 分类：问答