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使用C3P0连接池所需要的jar包:
c3p0-0.9.1.2.jar
commons-dbcp-1.4.jar
commons-dbutils-1.4.jar
commons-pool-1.5.6.jar
mysql-connector-java-5.1.39-bin.jar
ojdbc6.jar
utils代码:
package util;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.sql.DataSource;
import com.mchange.v2.c3p0.ComboPooledDataSource;
public class DataSourceUtils {
private static DataSource dataSource = new ComboPooledDataSource("mysql");
private static ThreadLocal<Connection> tl = new ThreadLocal<Connection>();
// 直接可以获取一个连接池
public static DataSource getDataSource() {
return dataSource;
}
public static Connection getConnection() throws SQLException{
return dataSource.getConnection();
}
// 获取连接对象
public static Connection getCurrentConnection() throws SQLException {
Connection con = tl.get();
if (con == null) {
con = dataSource.getConnection();
tl.set(con);
}
return con;
}
// 开启事务
public static void startTransaction() throws SQLException {
Connection con = getCurrentConnection();
if (con != null) {
con.setAutoCommit(false);
}
}
// 事务回滚
public static void rollback() throws SQLException {
Connection con = getCurrentConnection();
if (con != null) {
con.rollback();
}
}
// 提交并且 关闭资源及从ThreadLocall中释放
public static void commitAndRelease() throws SQLException {
Connection con = getCurrentConnection();
if (con != null) {
con.commit(); // 事务提交
con.close();// 关闭资源
tl.remove();// 从线程绑定中移除
}
}
// 关闭资源方法
public static void closeConnection() throws SQLException {
Connection con = getCurrentConnection();
if (con != null) {
con.close();
}
}
public static void closeStatement(Statement st) throws SQLException {
if (st != null) {
st.close();
}
}
public static void closeResultSet(ResultSet rs) throws SQLException {
if (rs != null) {
rs.close();
}
}
}
书写c3p0-config.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
<default-config>
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql://127.0.0.1:3306/learnj2ee?useSSL=false</property>
<property name="user">root</property>
<property name="password">123456</property>
<property name="initialPoolSize">5</property>
<property name="maxPoolSize">20</property>
</default-config>
<named-config name="oracle">
<property name="driverClass">oracle.jdbc.OracleDriver</property>
<property name="jdbcUrl">jdbc:oracle:thin:@10.10.130.115:1521:tgood</property>
<property name="user">infodba</property>
<property name="password">infodba</property>
</named-config>
<named-config name="mysql">
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql://127.0.0.1:3306/shop?useSSL=false</property>
<property name="user">root</property>
<property name="password">123456</property>
<property name="initialPoolSize">5</property>
<property name="maxPoolSize">20</property>
</named-config>
</c3p0-config>