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Spring Boot - Cannot determine embedded database driver class for database type NONE
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spring.datasource.url = jdbc:mysql://localhost/abc #spring.datasource.driverClassName = com.mysql.jdbc.Driver spring.datasource.name=olabsenglishdb spring.datasource.username=xxxx spring.datasource.password=xxxx spring.datasource.driver-class-name= com.m...
How do I select an entire row which has the largest ID in the table?
...show profiles and it appears our solutions have the same performance using MySQL. For my own knowledge, do you know what DBMS has poorer performance for subselects?
– unutbu
Feb 7 '14 at 20:08
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How to use JNDI DataSource provided by Tomcat in Spring?
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auth="Container"
type="javax.sql.DataSource"
driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/TestDB"
username="pankaj"
password="pankaj123"
maxActive="100"
maxIdle="20"
minIdle="5"
maxWait="10000"/>
back to context.xml de spring add this
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linux内存cached释放 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...缩短了 I/O系统调用(比如read,write,getdents)的时间。"
如何解决这个导致机器变慢的问题呢？
罪魁祸首就是内存都被cached了，free的基本没有了
所以我们应该想想如何把cached内存释放出来
重启机器肯定是可以解决，但是我们...
JPA: unidirectional many-to-one and cascading delete
...solution to why delete was not working. apparently hibernate was NOT using mysql Engine -INNODB , you need engine INNODB for mysql to generate foreign key constraint. Using the following properties in application.properties, makes spring boot/hibernate to use mysql engine INNODB. So foreign key co...
ERROR 1452: Cannot add or update a child row: a foreign key constraint fails
I have created tables in MySQL Workbench as shown below :
21 Answers
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In Ruby on Rails, what's the difference between DateTime, Timestamp, Time and Date?
...ith Rails and everything to do with whatever database you're using.
Using MySQL as an example (if for no other reason because it's most popular), you have DATE, DATETIME, TIME and TIMESTAMP column data types; just as you have CHAR, VARCHAR, FLOAT and INTEGER.
So, you ask, what's the difference? We...
How do I delete from multiple tables using INNER JOIN in SQL server
In MySQL you can use the syntax
13 Answers
13
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Insert into … values ( SELECT … FROM … )
... struggle to remember the correct syntax for the SQL engine of the day ( MySQL , Oracle , SQL Server , Informix , and DB2 ).
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How to add List to a List in asp.net [duplicate]
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Use Concat or Union extension methods. You have to make sure that you have this direction using System.Linq; in order to use LINQ extensions methods.
Use the AddRange method.
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