大约有 6,000 项符合查询结果（耗时：0.0276秒） [XML]
Limiting the number of records from mysqldump?
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As skaffman says, use the --where option:
mysqldump --opt --where="1 limit 1000000" database
Of course, that would give you the first million rows from every table.
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How should a model be structured in MVC? [closed]
...me, Domain Objects are completely unaware of storage - neither from where (SQL database, REST API, text file, etc.) nor even if they get saved or retrieved.
Data Mappers
These objects are only responsible for the storage. If you store information in a database, this would be where the SQL lives. Or...
Closing Database Connections in Java
...t ps = null;
ResultSet rs = null;
try {
// Do stuff
...
} catch (SQLException ex) {
// Exception handling stuff
...
} finally {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) { /* ignored */}
}
if (ps != null) {
try {
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Update a record without first querying?
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You can also use direct SQL against the database using the context of the datastore. Example:
dataEntity.ExecuteStoreCommand
("UPDATE items SET itemstatus = 'some status' WHERE id = 123 ");
For performance reasons, you may want to pass in var...
MySQL Query GROUP BY day / month / year
...ord_date), MONTH(record_date)
Check out the date and time functions in MySQL.
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How Scalable is SQLite? [closed]
I recently read this Question about SQLite vs MySQL and the answer pointed out that SQLite doesn't scale well and the official website sort-of confirms this , however.
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How to pass table value parameters to stored procedure from .net code
I have a SQL Server 2005 database. In a few procedures I have table parameters that I pass to a stored proc as an nvarchar (separated by commas) and internally divide into single values. I add it to the SQL command parameters list like this:
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What is the difference between JOIN and JOIN FETCH when using JPA and Hibernate
...OIN between the parent entity and the child entity tables in the generated SQL statement.
So, taking your example, when executing this JPQL query:
FROM Employee emp
JOIN emp.department dep
Hibernate is going to generate the following SQL statement:
SELECT emp.*
FROM employee emp
JOIN department...
Can the jQuery UI Datepicker be made to disable Saturdays and Sundays (and holidays)?
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This version of code will make u to get the holiday dates from the sql database and disable the specified date in the UI Datepicker
$(document).ready(function (){
var holiDays = (function () {
var val = null;
$.ajax({
'async': false,
'global': false,
'url...
Going from a framework to no-framework [closed]
...oming in from the outside.
Access your database via PDO with parameterized SQL to prevent SQL injection attacks.
Use the following PHP settings to make your site more resistant to session fixation and cookie theft:
session.use_only_cookies (Prevents your session token from leaking into the URL)
s...