總檔案c3p0-config.xml配置:

<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
    <default-config>
        <property name="automaticTestTable">con_test</property>
        <property name="checkoutTimeout">30000</property>
        <property name="idleConnectionTestPeriod"
 
>30</property>
        <property name="initialPoolSize">10</property>
        <property name="maxIdleTime">30</property>
        <property name="maxPoolSize">100</property>
        <property name="minPoolSize">10</property>
        <property name="maxStatements"
 
>200</property>

        <!-- 配置mysql資料庫配置 -->       
        <property name="driverClass">com.mysql.jdbc.Driver</property>
        <property name="user">root</property>
        <property name="password">1234</property>   
        <property name="jdbcUrl"
 
>jdbc:mysql://localhost:3306/mybatis</property>

            <user-overrides user="test-user">
                <property name="maxPoolSize">10</property>
                <property name="minPoolSize">1</property>
                <property name="maxStatements">0</property>
            </user-overrides>

    </default-config>

    <!-- This app is massive! -->
    <named-config name="intergalactoApp">
        <property name="acquireIncrement">50</property>
        <property name="initialPoolSize">100</property>
        <property name="minPoolSize">50</property>
        <property name="maxPoolSize">1000</property>

        <!-- intergalactoApp adopts a different approach to configuring statement 
            caching -->
        <property name="maxStatements">0</property>
        <property name="maxStatementsPerConnection">5</property>

        <!-- he's important, but there's only one of him -->
        <user-overrides user="master-of-the-universe">
            <property name="acquireIncrement">1</property>
            <property name="initialPoolSize">1</property>
            <property name="minPoolSize">1</property>
            <property name="maxPoolSize">5</property>
            <property name="maxStatementsPerConnection">50</property>
        </user-overrides>
    </named-config>
</c3p0-config>

工具類Conn:

public class Conn {
    private static ComboPooledDataSource c3p0 = new ComboPooledDataSource ();
    //獲取連結物件
    public static Connection getConnection() throws SQLException{
        Connection connection = c3p0.getConnection();
        return connection;
    }

    //釋放資源
    public static void close (Connection connection){
        if(connection!=null){
            try {
                DbUtils.close(connection);
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

}