大约有 9,000 项符合查询结果（耗时：0.0368秒） [XML]
Rails 3: Get Random Record
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Thing.first(:order => "RANDOM()") # For MySQL :order => "RAND()", - thanx, @DanSingerman
# Rails 3
Thing.order("RANDOM()").first
or
Thing.first(:offset => rand(Thing.count))
# Rails 3
Thing.offset(rand(Thing.count)).first
Actually, in Rails 3 all examples ...
How to allow remote connection to mysql
I have installed MySQL Community Edition 5.5 on my local machine and I want to allow remote connections so that I can connect from external source.
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Fastest way to determine if record exists
...sting point. I'm not sure if an Index exists on this field, and my newbish SQL doesn't know how to find out. I am working with this DB from Java via JDBC and the database is remotely located in a colo somewhere. I've only been provided a "database summary" which just details which fields exist in ea...
Why do loggers recommend using a logger per class?
... code.
A good example where this is not the best approach, is Hibernate's SQL logs. There is a shared logger named "Hibernate.SQL" or something like that, where a number of different classes write raw SQL out to a single logger category.
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MySQL: Order by field size/length
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@mastazi according to MySQL documentation: OCTET_LENGTH() is a synonym for LENGTH().
– Heitor
Oct 1 '17 at 5:35
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Call a stored procedure with parameter in c#
...operly:
private void button1_Click(object sender, EventArgs e) {
using (SqlConnection con = new SqlConnection(dc.Con)) {
using (SqlCommand cmd = new SqlCommand("sp_Add_contact", con)) {
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@FirstName", SqlDbType.VarC...
On delete cascade with doctrine2
...;br />\n";
}
If you now do
# doctrine orm:schema-tool:create --dump-sql
you will see that the same SQL will be generated as in the first, raw-SQL example
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What is the purpose of AsQueryable()?
...yable() is explained in Using AsQueryable With Linq To Objects And Linq To SQL. In particular, the article states,
This offers an excellent benefits in real word scenarios where you have certain methods on an entity that return an IQueryable of T and some methods return List. But then you have ...
Is there any connection string parser in C#?
...e base class from which the
strongly typed connection string
builders (SqlConnectionStringBuilder,
OleDbConnectionStringBuilder, and so
on) derive. The connection string
builders let developers
programmatically create syntactically
correct connection strings, and parse
and rebuild ex...
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奥特加贫困的童年
由于温饱难以解决，8岁那年奥特加举家搬往拉科鲁尼亚，这是个极其混乱的小渔村。13岁那年，奥特加终于迫于生活的压力辍...