大约有 1,948 项符合查询结果（耗时：0.0159秒） [XML]
Most efficient conversion of ResultSet to JSON?
...rd with the reading. I think Oracle cursor are server side by default. For MySQL > 5.0.2 look for useCursorFetch at connection url paramenter. Check about your favourite DBMS.
1: So to use less memory we must:
use server side cursor behind the scene
use resultset open as read only and, of cour...
Batch file to delete files older than N days
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I used this syntax on Win Server 2008: forfiles /P "C:\Mysql_backup" /S /M *.sql /D -30 /C "cmd /c del @PATH"
– jman
Apr 18 '11 at 8:42
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How to create ENUM type in SQLite?
I need to convert a table from MySQL to SQLite, but I can't figure out how to convert an enum field, because I can't find ENUM type in SQLite.
...
What is the use of a private static variable in Java?
...:
public class Example {
private final static String JDBC_URL = "jdbc:mysql://localhost/shopdb";
private final static String JDBC_USERNAME = "username";
private final static String JDBC_PASSWORD = "password";
public static void main(String[] args) {
Connection conn = Driver...
Stop Excel from automatically converting certain text values to dates
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In my MySQL query (for CSV output through PHP), I used CONCAT('\t', column_name). Also did the trick. Thanks!
– Just Plain High
Jun 24 '16 at 14:39
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Hibernate: Automatically creating/updating the db tables based on entity classes
...>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
</props>
</property>
</bean>
share
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What Java ORM do you prefer, and why? [closed]
...ented data models. Instead, your company runs several instances of Oracle, MySQL, MSSQL, DB2 or any other RDBMS.
SQL has a structure and syntax. It should not be expressed using "low-level" String concatenation in JDBC - or "high-level" String concatenation in HQL - both of which are prone to hold s...
SQLAlchemy: print the actual query
...ho=True, to log all SQL queries. For example:
engine = create_engine(
"mysql://scott:tiger@hostname/dbname",
encoding="latin1",
echo=True,
)
This can also be modified for just a single request:
echo=False – if True, the Engine will log all statements as well as a repr() of their para...
Tab space instead of multiple non-breaking spaces (“nbsp”)?
... Was looking for this when building a large concat() query in MySQL for use in a Crystal Report. the ASCII (&#09;) did the job perfectly!
– MikeMighty
Mar 9 '18 at 14:40
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String.Join method that ignores empty strings?
...it's even simpler, since you can do it in SQL directly:
PostgreSQL & MySQL:
SELECT
concat_ws(' / '
, NULLIF(searchTerm1, '')
, NULLIF(searchTerm2, '')
, NULLIF(searchTerm3, '')
, NULLIF(searchTerm4, '')
) AS RPT_SearchTerms;
And even with the glori...