/**
* @author xichao.dong
* @email 406592176@qq.com
* @date 2014-8-15 上午8:50:38
* @company (开发公司) 珠海市冰川软件有限公司
* @copyright (版权) 本文件归属珠海市冰川软件有限公司所有
* @version V1.0
* @modify (修改) : 2014-8-15 上午8:50:38 xichao.dong
* @Review (审核人) ：xichao.dong
*/
package com.glacier.basic.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
import org.springframework.core.io.ClassPathResource;
/**
* @ClassName: DBHelper
* @Description: TODO(获取数据库连接)
* @author xichao.dong
* @email 406592176@qq.com
* @date 2014-8-15 上午11:12:05
*/
public final class DBHelper {
// 此方法为获取数据库连接
public static Connection getConnection() {
Connection conn = null;
try {
// 通过读取配置文件获取jdbc连接参数
ClassPathResource classPathResource = new ClassPathResource("spring/config.properties");
Properties p = new Properties();
p.load(classPathResource.getInputStream());
String driver = p.getProperty("connection.driver"); // 数据库驱动
String url = p.getProperty("connection.url");// 数据库
String user = p.getProperty("connection.username");// 用户名
String password = p.getProperty("connection.password");// 密码
Class.forName(driver); // 加载数据库驱动
if (null == conn) {
conn = DriverManager.getConnection(url, user, password);
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
/**
* 增删改【Add、Del、Update】
*
* @param sql
* @return int
*/
public static int executeNonQuery(String sql) {
int result = 0;
Connection conn = null;
Statement stmt = null;
try {
conn = getConnection();
stmt = conn.createStatement();
result = stmt.executeUpdate(sql);
} catch (SQLException err) {
err.printStackTrace();
free(null, stmt, conn);
} finally {
free(null, stmt, conn);
}
return result;
}
/**
* 增删改【Add、Delete、Update】
*
* @param sql
* @param obj
* @return int
*/
public static int executeNonQuery(String sql, Object... obj) {
int result = 0;
Connection conn = null;
PreparedStatement pstmt = null;
try {
conn = getConnection();
pstmt = conn.prepareStatement(sql);
for (int i = 0; i < obj.length; i++) {
pstmt.setObject(i + 1, obj[i]);
}
result = pstmt.executeUpdate();
} catch (SQLException err) {
err.printStackTrace();
free(null, pstmt, conn);
} finally {
free(null, pstmt, conn);
}
return result;
}
/**
* 查【Query】
*
* @param sql
* @return ResultSet
*/
public static ResultSet executeQuery(String sql) {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
conn = getConnection();
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
} catch (SQLException err) {
err.printStackTrace();
free(rs, stmt, conn);
}
return rs;
}
/**
* 查【Query】
*
* @param sql
* @param obj
* @return ResultSet
*/
public static ResultSet executeQuery(String sql, Object... obj) {
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
conn = getConnection();
pstmt = conn.prepareStatement(sql);
for (int i = 0; i < obj.length; i++) {
pstmt.setObject(i + 1, obj[i]);
}
rs = pstmt.executeQuery();
} catch (SQLException err) {
err.printStackTrace();
free(rs, pstmt, conn);
}
return rs;
}
/**
* 判断记录是否存在
*
* @param sql
* @return Boolean
*/
public static Boolean isExist(String sql) {
ResultSet rs = null;
try {
rs = executeQuery(sql);
rs.last();
int count = rs.getRow();
if (count > 0) {
return true;
} else {
return false;
}
} catch (SQLException err) {
err.printStackTrace();
free(rs);
return false;
} finally {
free(rs);
}
}
/**
* 判断记录是否存在
*
* @param sql
* @return Boolean
*/
public static Boolean isExist(String sql, Object... obj) {
ResultSet rs = null;
try {
rs = executeQuery(sql, obj);
rs.last();
int count = rs.getRow();
if (count > 0) {
return true;
} else {
return false;
}
} catch (SQLException err) {
err.printStackTrace();
free(rs);
return false;
} finally {
free(rs);
}
}
/**
* 获取查询记录的总行数
*
* @param sql
* @return int
*/
public static int getCount(String sql) {
int result = 0;
ResultSet rs = null;
try {
rs = executeQuery(sql);
rs.last();
result = rs.getRow();
} catch (SQLException err) {
free(rs);
err.printStackTrace();
} finally {
free(rs);
}
return result;
}
/**
* 获取查询记录的总行数
*
* @param sql
* @param obj
* @return int
*/
public static int getCount(String sql, Object... obj) {
int result = 0;
ResultSet rs = null;
try {
rs = executeQuery(sql, obj);
rs.last();
result = rs.getRow();
} catch (SQLException err) {
err.printStackTrace();
} finally {
free(rs);
}
return result;
}
/**
* 释放【ResultSet】资源
*
* @param rs
*/
public static void free(ResultSet rs) {
try {
if (rs != null) {
rs.close();
}
} catch (SQLException err) {
err.printStackTrace();
}
}
/**
* 释放【Statement】资源
*
* @param st
*/
public static void free(Statement st) {
try {
if (st != null) {
st.close();
}
} catch (SQLException err) {
err.printStackTrace();
}
}
/**
* 释放【Connection】资源
*
* @param conn
*/
public static void free(Connection conn) {
try {
if (conn != null) {
conn.close();
}
} catch (SQLException err) {
err.printStackTrace();
}
}
/**
* 释放所有数据资源
*
* @param rs
* @param st
* @param conn
*/
public static void free(ResultSet rs, Statement st, Connection conn) {
free(rs);
free(st);
free(conn);
}
}