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This article introduces the relevant knowledge of "what are the methods for java web applications to connect to the database". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

DriverManager

Get database connection

Then use statement

Preparedstatement

Resultset operates the database.

The drawback of this approach is that database names, user names and passwords need to be hard-coded in the code. Once these things change, the whole program needs to be recompiled.

2 javax.sql.* usage

DataSource, which uses connection pooling. For such resources in web applications, we can configure them in context.xml so that we only need to look up the table and use JNDI to obtain connection pooling connections. The database name, username and password only need to be changed by modifying the context.xml file.

Context.xml can be configured in 2 places

(1) tomcat server tomcat/conf/context.xml

Add directly to the file

Auth= "Container"

Type= "javax.sql.DataSource"

DriverClassName= "org.gjt.mm.mysql.Driver"

Url= "jdbc:mysql://localhost/testforjavajdbc"

Username= "root"

Password= "root"

MaxActive= "100"

MaxIdle= "30"

MaxWait= "10000" / >

The server loads resources when it is turned on, and the application uses JNDI

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