1、准备通用类
（引用：c3p0-0.9.1.2.jar）
package nankang.test;
import java.sql.Connection;
import com.mchange.v2.c3p0.ComboPooledDataSource;
public class ConnectionFactory {
private static ComboPooledDataSource ds = null;
static {
try {
String driver = "oracle.jdbc.driver.OracleDriver";
String url = "jdbc:oracle:thin:@127.0.0.1:1521:orcl";
String user = "phonesurvey";
String password = "world";
ds = new ComboPooledDataSource();
ds.setDriverClass(driver);
ds.setJdbcUrl(url);
ds.setUser(user);
ds.setPassword(password);
ds.setMaxPoolSize(200);
ds.setMinPoolSize(20);
} catch (Exception e) {
e.printStackTrace();
}
}
public static synchronized Connection getConnection(){
Connection conn = null;
try{
conn = ds.getConnection();
}catch(Exception e){
e.printStackTrace();
}
return conn;
}
}2、调用
package nankang.test; import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet; public class Main { /**
* @param args
*/
public static void main(String[] args) { Connection conn = null;
PreparedStatement pstm = null;
ResultSet rs = null; try {
conn = ConnectionFactory.getConnection(); String sql = "select * from Agent";
pstm = conn.prepareStatement(sql);
rs = pstm.executeQuery();
while (rs.next()) {
String agentId = rs.getString("AgentId"); System.out.println(agentId);
} System.out.println("成功");
} catch (Exception e) {
System.out.println(String.format("失败，%s", e.getMessage()));
} finally {
if (rs != null) {
try {
rs.close();
} catch (Exception e) {
e.printStackTrace();
}
}
if (pstm != null) {
try {
pstm.close();
} catch (Exception e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
} }