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gistfile1.txt
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package lanqiao.test;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import com.mysql.jdbc.ResultSetMetaData;
/**
* JDBC链接mysql数据库查询
* @author xyb
*
*/
public class SqlHelper {
private static final String url="jdbc:mysql://10.8.0.163:3306/test?Unicode=true&characterEncoding=utf-8&useSSL=false";
private static final String user="root";
private static final String password="admin";
//static Connection conn=null;全局唯一,线程不安全
static ThreadLocal<Connection> local=new ThreadLocal<Connection>();
static{
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static Connection openConnection(){
Connection conn=local.get();
try {
if(conn==null||conn.isClosed()){
conn=DriverManager.getConnection(url,user,password);
local.set(conn);
}
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
}
/**
*
* @param sql
* @param objects
* @return
*/
public static List<HashMap<String,Object>> select1(String sql,Object ... objects){
Connection conn=SqlHelper.openConnection();
PreparedStatement pre=null;
ResultSet re=null;
List<HashMap<String,Object>>rows=new ArrayList<HashMap<String,Object>>();
try {
pre=conn.prepareStatement(sql);
if(pre!=null){
for(int i=0;i<objects.length;i++){
pre.setObject(i+1, objects[i]);
}
}
re= pre.executeQuery();
java.sql.ResultSetMetaData remeta=re.getMetaData();
//获取列头元素
int length =remeta.getColumnCount();
//获取列的数量
while(re.next()){
HashMap<String,Object> map=new HashMap<String,Object>();
for(int i=0;i<length;i++){
String columnlable=remeta.getColumnLabel(i+1);
map.put(columnlable, re.getObject(columnlable));
//根据列的标签名获取数据
}
rows.add(map);
}
//数据解析完毕,调用了实现子类Mapping的方法
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
throw new RuntimeException("执行出错",e);
}finally{
if(re!=null){
try {
re.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();
}
}
}
return rows;
}
/**
* 查询
* @param sql
* @param handerMapper
* @param objects
* @return
*/
public static <T>List<T> select(String sql,RowHandlerMapper<T>handerMapper,Object...objects){
Connection conn=SqlHelper.openConnection();
PreparedStatement pre=null;
ResultSet re=null;
List<T>rows=null;
try {
pre=conn.prepareStatement(sql);
if(pre!=null){
for(int i=0;i<objects.length;i++){
pre.setObject(i+1, objects[i]);
}
}
re= pre.executeQuery();
rows=handerMapper.mapping(re);
//数据解析完毕,调用了实现子类Mapping的方法
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
throw new RuntimeException("执行出错",e);
}finally{
if(re!=null){
try {
re.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();
}
}
}
return rows;
}
public void close(){
Connection conn=local.get();
if(conn!=null){
try {
conn.close();
local.remove();
conn