c3p0 usage record in java

• First of all, you need to import the c3p0 package.c3p0After downloading and decompressing, there are three packages in the lib directory, use mysql If , you only need to import c3p0-0.9.5.2.jar,mchange-commons-java-0.2.11.jar.

• ##To connect to the

  mysql database, you need to import mysql-connector-java-5.1.42-bin.jar.

• For convenience To operate the database link for query, you need to import

  commons-dbutils-1.6.jar,commons-collections-3.2.2.jar,commons-logging-1.2.jar.

##In order to make
• c3p0

  easy to maintain, c3p0-config.xml

  <?xml version="1.0" encoding="UTF-8"?><c3p0-config>
    <default-config><property name="user">root</property><property name="password">root</property><property name="jdbcUrl">jdbc:mysql://127.0.0.1:3306/day20</property><property name="driverClass">com.mysql.jdbc.Driver</property>
    </default-config></c3p0-config>

  needs to be created in the src directory
Use
• c3p0

  import javax.sql.DataSource;import com.mchange.v2.c3p0.ComboPooledDataSource;public class JdbcUtils {private static ComboPooledDataSource ds;static {
      ds = new ComboPooledDataSource();
  }public static DataSource getDataSource(){return ds;
  }
  }

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