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How can I start PostgreSQL server on Mac OS X?
I had forgotten to run the initdb command.
33 Answers
33
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$(this).serialize() — How to add a value?
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This is the best way to do it, no playing with strings
– Brett Gregson
Nov 25 '15 at 10:45
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How to write DataFrame to postgres table?
... the table
conn = engine.raw_connection()
cur = conn.cursor()
output = io.StringIO()
df.to_csv(output, sep='\t', header=False, index=False)
output.seek(0)
contents = output.getvalue()
cur.copy_from(output, 'table_name', null="") # null values become ''
conn.commit()
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Hidden Features of MySQL
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Binary Protocol:
MySQL 4.1 introduced a binary protocol that allows non-string data values to be sent
and returned in native format without conversion to and from string format. (Very usefull)
Aside, mysql_real_query() is faster than mysql_query() because it does not call strlen()
to opera...
IPC performance: Named Pipe vs Socket
...y? I would prefer to use sockets because they can do two-way communication and are very flexible but will choose speed over flexibility if it is by considerable amount.
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How do I get the size of a java.sql.ResultSet?
...NLY,
ResultSet.CONCUR_READ_ONLY);
String from_where="FROM myTable WHERE ...blahblah... ";
//h4x
ResultSet rs=s.executeQuery("select count(*)as RECORDCOUNT,"
+ "cast(null as boolean)as MYBOOL,"
+ ...
Do you have to restart apache to make re-write rules in the .htaccess take effect?
...page in the same directory.
Lastly, you can enable a rewrite log using commands like the following in your httpd.conf:
RewriteLog "logs/rewritelog"
RewriteLogLevel 7
The log file thus generated will give you the gory detail of which rewrite rules matched and how they were handled.
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Difference between Hashing a Password and Encrypting it
...sible, you apply the secure hash algorithm and you cannot get the original string back. The most you can do is to generate what's called "a collision", that is, finding a different string that provides the same hash. Cryptographically secure hash algorithms are designed to prevent the occurrence of ...
Using StringWriter for XML Serialization
...lly added <?xml version="1.0" encoding="utf-8"?><test/> to the string, then declaring the SqlParameter to be of type SqlDbType.Xml or SqlDbType.NVarChar would give you the "unable to switch the encoding" error. Then, when inserting manually via T-SQL, since you switched the declared enco...
Is there a float input type in HTML5?
...g to html5.org , the "number" input type's "value attribute, if specified and not empty, must have a value that is a valid floating point number."
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