c3po-test

导入c3p0-0.9.5.2.jar、mchange-commons-java-0.2.11.jar、mysql-connector-java-8.0.17.jar

1.c3p0-config.xml：

<?xml version="1.0" encoding="utf-8" ?>

<c3p0-config>
    <default-config>
        <property name="user">root</property>
        <property name="password"></property>
        <property name="driverClass">com.mysql.jdbc.Driver</property>
        <property name="jdbcUrl">jdbc:mysql://localhost:3306/bookstore</property>
    </default-config>
</c3p0-config>

2.utils：

public class utils {

    private static DataSource dataSource = new ComboPooledDataSource();
    private static ThreadLocal<Connection> threadLocal = new ThreadLocal<Connection>();

    public static Connection getConnection() throws SQLException {
        Connection connection = threadLocal.get();
        if (connection == null) {
            connection = dataSource.getConnection();
            threadLocal.set(connection);
        }
        return connection;
    }

}