c3p0操作MySQL数据库

使用c3p0连接MySQL数据库并对MySQL数据库进行基本操作。

 

 

1. [文件] 数据库准备 ~ 226B     下载(64)

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##创建数据库并指定编码 create database test character set utf8; ##切换数据库 use test; ##创建表格 create table user( id int primary key auto_increment, name varchar(50), password varchar(50) );

2. [文件] c3p0-config.xml ~ 1KB     下载(96)

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<c3p0-config>     <!-- 默认配置，如果没有指定则使用这个配置 -->     <default-config>         <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>         <user-overrides user="test-user">             <property name="maxPoolSize">10</property>             <property name="minPoolSize">1</property>             <property name="maxStatements">0</property>         </user-overrides>     </default-config>     <!-- 命名的配置 -->     <named-config name="test">         <property name="driverClass">com.mysql.jdbc.Driver</property>         <property name="jdbcUrl">jdbc:mysql:///test?useUnicode=true&amp;characterset=utf-8         </property>         <property name="user">root</property>         <property name="password">1234</property>         <!-- 如果池中数据连接不够时一次增长多少个 -->         <property name="acquireIncrement">5</property>         <property name="initialPoolSize">20</property>         <property name="minPoolSize">10</property>         <property name="maxPoolSize">40</property>         <property name="maxStatements">0</property>         <property name="maxStatementsPerConnection">5</property>     </named-config> </c3p0-config>

3. [文件] C3P0Utils.java ~ 615B     下载(85)

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import java.sql.Connection; import java.sql.SQLException;   import javax.sql.DataSource;   import com.mchange.v2.c3p0.ComboPooledDataSource;   /**  * c3p0连接MySQL数据库工具包  *  * @author 冰雨凌風  *  */ public class C3P0Utils {     // 定义全局变量     private static ComboPooledDataSource cpds;     // 静态代码块     static {         cpds = new ComboPooledDataSource("test");     }       // 获得数据源     public static DataSource getDataSource() {         return cpds;     }       // 获得连接     public static Connection getConnection() throws Exception {         return cpds.getConnection();     } }

4. [文件] User.java ~ 583B     下载(54)

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public class User {     private String id;     private String name;     private String password;       public String getId() {         return id;     }       public void setId(String id) {         this.id = id;     }       public String getName() {         return name;     }       public void setName(String name) {         this.name = name;     }       public String getPassword() {         return password;     }       public void setPassword(String password) {         this.password = password;     }       @Override     public String toString() {         return "User [id=" + id + ", name=" + name + ", password=" + password                 + "]";     }   }

5. [文件] C3P0Test.java ~ 2KB     下载(64)

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import java.sql.SQLException;   import org.apache.commons.dbutils.QueryRunner; import org.apache.commons.dbutils.handlers.BeanHandler; import org.junit.Test;   /**  * 利用dbutils对数据库进行CURD操作  *  * @author 冰雨凌風  *  */ public class C3P0Test {     /**      * 在数据库中插入数据      */     @Test     public void add() {         try {             // 创建执行者             QueryRunner runner = new QueryRunner(C3P0Utils.getDataSource());             // 准备sql语句             String sql = "insert into user(name,password) value(?,?)";             // 准备参数             Object[] params = { "admin", "1234" };             // 执行语句             runner.update(sql, params);             System.out.println("插入数据成功！");         } catch (SQLException e) {             throw new RuntimeException(e);         }     }       /**      * 查询数据      */     @Test     public void query() {         try {             // 创建执行者             QueryRunner runner = new QueryRunner(C3P0Utils.getDataSource());             // 准备sql语句             String sql = "select * from user";             // 执行语句             User user = runner.query(sql, new BeanHandler<User>(User.class));             System.out.println(user);         } catch (SQLException e) {             throw new RuntimeException(e);         }     }       /**      * 更新数据      */     @Test     public void update() {         try {             // 创建执行者             QueryRunner runner = new QueryRunner(C3P0Utils.getDataSource());             // 准备sql语句             String sql = "update user set password=? where name=?";             // 准备参数             Object[] params = { "123456", "admin" };             // 执行语句             runner.update(sql, params);             System.out.println("更新数据成功！");         } catch (SQLException e) {             throw new RuntimeException(e);         }     }       /**      * 删除数据      */     @Test     public void delete() {         try {             // 创建执行者             QueryRunner runner = new QueryRunner(C3P0Utils.getDataSource());             // 准备sql语句             String sql = "delete from user";             // 执行语句             runner.update(sql);             System.out.println("删除数据成功");         } catch (SQLException e) {             throw new RuntimeException(e);         }     } }