1. 創(chuàng)建一個名稱為JDBC_C3P0的Java工程

2. 添加c3p0的jar

3. 代碼中設(shè)置連接數(shù)據(jù)庫的信息

4. 在配置文件c3p0-config.xml(必須叫這個名字, 并且放置在src目錄下, 因為這樣可以自動加載)中設(shè)置連接數(shù)據(jù)庫的信息

5. c3p0-config.xml配置詳情

<?xml version="1.0" encoding="UTF-8"?> <c3p0-config><!-- default-config 默認(rèn)的配置 --><default-config><property name="driverClass">com.mysql.cj.jdbc.Driver</property><property name="jdbcUrl">jdbc:mysql://192.168.25.130:3306/studyjdbc?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf-8&amp;serverTimezone=Asia/Shanghai</property><property name="user">root</property><property name="password">lyw123456</property><!-- 初始化連接池數(shù)量 --><property name="initialPoolSize">10</property><!-- 數(shù)據(jù)庫連接最大空閑時間 --><property name="maxIdleTime">30</property><!-- 池子最大連接數(shù) --><property name="maxPoolSize">100</property><!-- 池子最小連接數(shù) --><property name="minPoolSize">10</property><!-- 最大Statements對象數(shù) --><property name="maxStatements">200</property></default-config></c3p0-config>

6. 使用c3p0-config.xml配置文件建立數(shù)據(jù)庫連接

7. 使用c3p0數(shù)據(jù)庫連接池代碼

package com.lywgames.myjdbc;import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.SQLException; import java.sql.Timestamp; import com.mchange.v2.c3p0.ComboPooledDataSource;public class MyJDBC {public static void main(String[] args) {c3p0UseConfig();}public static void c3p0() {Connection conn = null;PreparedStatement ps = null;try {//1. 創(chuàng)建datasourceComboPooledDataSource dataSource = new ComboPooledDataSource();//2. 設(shè)置連接數(shù)據(jù)庫的信息dataSource.setDriverClass("com.mysql.cj.jdbc.Driver");dataSource.setJdbcUrl("jdbc:mysql://192.168.25.130:3306/studyjdbc?useSSL=true&useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai");dataSource.setUser("root");dataSource.setPassword("lyw123456");//3. 得到連接對象conn = dataSource.getConnection();ps = conn.prepareStatement("insert into user values(null,?,?,?)");ps.setString(1, "machao");ps.setString(2, "123456");ps.setTimestamp(3, new Timestamp(System.currentTimeMillis()));ps.executeUpdate();} catch (Exception e) {e.printStackTrace();}finally {try {if(ps != null){ps.close();}} catch (SQLException e) {e.printStackTrace();}finally{ps = null;}}}public static void c3p0UseConfig() {Connection conn = null;PreparedStatement ps = null;try {//1. 創(chuàng)建datasource通過類加載器查找c3p0-config.xmlComboPooledDataSource dataSource = new ComboPooledDataSource();//2. 得到連接對象conn = dataSource.getConnection();ps = conn.prepareStatement("insert into user values(null,?,?,?)");ps.setString(1, "pangjuan");ps.setString(2, "123456");ps.setTimestamp(3, new Timestamp(System.currentTimeMillis()));ps.executeUpdate();} catch (Exception e) {e.printStackTrace();}finally {try {if(ps != null){ps.close();}} catch (SQLException e) {e.printStackTrace();}finally{ps = null;}}} }

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