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使用c3p0连接池
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c3p0-config.xml
| <?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
????
????<default-config>
????????<property name="driverClass">com.mysql.jdbc.Driver</property>
????????<property name="jdbcUrl">jdbc:mysql://localhost:3306/dbcp</property>
????????<property name="user">root</property>
????????<property name="password">123456</property>
????????<property name="acquireIncrement">5</property>
????????<property name="initialPoolSize">10</property>
????????<property name="minPoolSize">5</property>
????????<property name="maxPoolSize">20</property>
????</default-config>
</c3p0-config> ? |
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C3p0Util
| import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import com.mchange.v2.c3p0.ComboPooledDataSource;
public class C3p0Util {
????private static ComboPooledDataSource ds = null;
????//在靜態(tài)代碼塊中創(chuàng)建數(shù)據(jù)庫(kù)連接池
????static{
????????try{
????????????ds = new ComboPooledDataSource("c3p0-config");//使用C3P0的命名配置來(lái)創(chuàng)建數(shù)據(jù)源
????????}catch (Exception e) {
????????????throw new ExceptionInInitializerError(e);
????????}
????}
????public static Connection getConnection() throws SQLException{
????????//從數(shù)據(jù)源中獲取數(shù)據(jù)庫(kù)連接
????????return ds.getConnection();
????}
????public static void close(Connection conn,Statement st,ResultSet rs){
????????if(rs!=null){
????????????try{
????????????????rs.close();
????????????}catch (Exception e) {
????????????????e.printStackTrace();
????????????}
????????}
????????if(st!=null){
????????????try{
????????????????st.close();
????????????}catch (Exception e) {
????????????????e.printStackTrace();
????????????}
????????}
????????if(conn!=null){
????????????try{
????????????????conn.close();
????????????}catch (Exception e) {
????????????????e.printStackTrace();
????????????}
????????}
????}
} ? |
TestC3p0Util
| import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import com.mchange.v2.c3p0.ComboPooledDataSource;
public class C3p0Util {
????private static ComboPooledDataSource ds = null;
????//在靜態(tài)代碼塊中創(chuàng)建數(shù)據(jù)庫(kù)連接池
????static{
????????try{
????????????ds = new ComboPooledDataSource("c3p0-config");//使用C3P0的命名配置來(lái)創(chuàng)建數(shù)據(jù)源
????????}catch (Exception e) {
????????????throw new ExceptionInInitializerError(e);
????????}
????}
????public static Connection getConnection() throws SQLException{
????????//從數(shù)據(jù)源中獲取數(shù)據(jù)庫(kù)連接
????????return ds.getConnection();
????}
????public static void close(Connection conn,Statement st,ResultSet rs){
????????if(rs!=null){
????????????try{
????????????????rs.close();
????????????}catch (Exception e) {
????????????????e.printStackTrace();
????????????}
????????}
????????if(st!=null){
????????????try{
????????????????st.close();
????????????}catch (Exception e) {
????????????????e.printStackTrace();
????????????}
????????}
????????if(conn!=null){
????????????try{
????????????????conn.close();
????????????}catch (Exception e) {
????????????????e.printStackTrace();
????????????}
????????}
????}
} ? |
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