package cn.kam.dao;
import java. io .IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;
public class BasDao {
private static String driverName ;//驱动名
private static String url ;//连接地址
private static String user ;//数据库名字
private static String password ; //数据库密码
protected Connection conn = null;//连接
protected PreparedStatement pstmt = null;//进行增删改的接口对象
protected ResultSet rs = null;//结果集对象
static{
InputStream is = BasDao.class.getClassLoader().getResourceAsStream(“database.properties”);
Properties prop = new Properties();
try {
prop.load(is);
driverName = prop.getProperty(“driverName”);
url = prop.getProperty(“url”);
user = prop.getProperty(“user”);
password = prop.getProperty(“password”);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//通用连接
public Connection getConnection() throws ClassNotFoundException, SQLException{
Connection conn = null;
Class.forName(driverName);
conn = DriverManager.getConnection(url, user, password);
return conn;
}
//关闭所有
public void close All(ResultSet rs,PreparedStatement pstmt,Connection con){
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (pstmt != null) {
try {
pstmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
//查询
public ResultSet query(String sql,Object… args)throws ClassNotFoundException,SQLException{
ResultSet rs = null;
conn = getConnection();
pstmt = conn.prepareStatement(sql);
//对 占位符 进行处理
if(args!=null){
for (int i = 0; i < args.length; i++) {
pstmt.setObject(i+1, args[i]);
}
}
rs = pstmt.executeQuery();
return rs;
}
//增删改
public int update(String sql,Object… args){
int ret = 0;
try {
conn = getConnection();
pstmt = conn.prepareStatement(sql);
//对占位符进行处理
if(args!=null){
for (int i = 0; i < args.length; i++) {
pstmt.setObject(i+1, args[i]);
}
}
ret = pstmt.executeUpdate();
} catch (ClassNotFoundException | SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ret;
}
}
