JDBC learning notes

What is? JDBC

Personal understanding ： In fact, when we are studying databases , Through the data client , But in fact, we can't log in to the client and execute the corresponding... Without logging in to the database once sqi sentence , But whenever the database needs to change , The program automatically executes the corresponding statement , This is it. jdbc The role of

JDBC The core idea of

JDBC Environment building

1. The first step must be to create one java engineering , stay java Create one below the project lib Document clip , And put our driver file Set the file to lib
   
   

JDBC Development steps

Detailed code

Result Result set , Traverse the way

Examples are as follows ：
Get the row data according to the column value

Get the row data according to the column name

Common mistakes

sql Injection problem

Wrapper utility class