package com.yunti.utils;
import java.lang.reflect.Field;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class JdbcUtils {
private final static String URL = "jdbc:mysql://127.0.0.1:3306/network";
private final static String USER = "root";
private final static String PWD = "";
private final static String Driver = "com.mysql.jdbc.Driver";
private Connection connection;
private PreparedStatement prepareStatement;
private ResultSet resultSet;
public JdbcUtils() {
try {
Class.forName(Driver);
connection = DriverManager.getConnection(URL,USER,PWD);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 多條查詢
* @param sql
* @param params
* @return
* @throws SQLException
*/
public List<Map<String,Object>> findMoreByStatement(String sql,List<Object> params) throws SQLException{
List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();
prepareStatement = connection.prepareStatement(sql);
if(params!=null&&!params.isEmpty()){
for(int i=0;i<params.size();i++){
prepareStatement.setObject(i+1, params.get(i));
}
}
resultSet = prepareStatement.executeQuery();
ResultSetMetaData rsmd = resultSet.getMetaData();
while(resultSet.next()){
Map<String,Object> map = new HashMap<String,Object>();
for(int i=1;i<=rsmd.getColumnCount();i++){
String column_name = rsmd.getColumnName(i);
Object column_value = resultSet.getObject(column_name);
if(column_value == null){
column_value = "";
}
map.put(column_name, column_value);
}
list.add(map);
}
return list;
}
/**
* 單條查詢
* @param sql
* @param params
* @return
* @throws SQLException
*/
public Map<String,Object> findByStatement(String sql,List<Object> params) throws SQLException{
Map<String,Object> map = new HashMap<String,Object>();
prepareStatement = connection.prepareStatement(sql);
if(params!=null&&!params.isEmpty()){
for(int i=0;i<params.size();i++){
prepareStatement.setObject(i+1, params.get(i));
}
}
resultSet = prepareStatement.executeQuery();
ResultSetMetaData rsmd = resultSet.getMetaData();
while(resultSet.next()){
for(int i=1;i<=rsmd.getColumnCount();i++){
String column_name = rsmd.getColumnName(i);
Object column_value = resultSet.getObject(column_name);
if(column_value == null){
column_value = "";
}
map.put(column_name, column_value);
}
}
return map;
}
/**
* 反射單條查詢
* @param sql
* @param params
* @param c
* @return
* @throws Exception
*/
public <T> T findByStatement(String sql,List<Object> params,Class<T> c) throws Exception{
T resultObj = null;
prepareStatement = connection.prepareStatement(sql);
if(params!=null&&!params.isEmpty()){
for(int i=0;i<params.size();i++){
prepareStatement.setObject(i+1, params.get(i));
}
}
resultSet = prepareStatement.executeQuery();
ResultSetMetaData rsmd = resultSet.getMetaData();
while(resultSet.next()){
resultObj = c.newInstance();
for(int i=1;i<=rsmd.getColumnCount();i++){
String column_name = rsmd.getColumnName(i);
Object column_value = resultSet.getObject(column_name);
if(column_value == null){
column_value = "";
}
Field field = c.getDeclaredField(column_name);
field.setAccessible(true);
field.set(resultObj, column_value);
}
}
return resultObj;
}
/**
* 反射多條查詢
* @param sql
* @param params
* @param c
* @return
* @throws Exception
*/
public <T> List<T> findMoreByStatement(String sql,List<Object> params,Class<T> c) throws Exception{
List<T> list = new ArrayList<T>();
prepareStatement = connection.prepareStatement(sql);
if(params!=null&&!params.isEmpty()){
for(int i=0;i<params.size();i++){
prepareStatement.setObject(i+1, params.get(i));
}
}
resultSet = prepareStatement.executeQuery();
ResultSetMetaData rsmd = resultSet.getMetaData();
while(resultSet.next()){
T resultObj = c.newInstance();
for(int i=1;i<=rsmd.getColumnCount();i++){
String column_name = rsmd.getColumnName(i);
Object column_value = resultSet.getObject(column_name);
if(column_value == null){
column_value = "";
}
Field field = c.getDeclaredField(column_name);
field.setAccessible(true);
field.set(resultObj, column_value);
}
list.add(resultObj);
}
return list;
}
/**
* 數據增刪改
* @param sql
* @param params
* @return
* @throws SQLException
*/
public boolean updateByPrepareStatement(String sql,List<Object> params) throws SQLException{
boolean flag = false;
int result = -1;
prepareStatement = connection.prepareStatement(sql);
if(params != null && !params.isEmpty()){
for (int i = 0; i < params.size(); i++) {
prepareStatement.setObject(i+1, params.get(i));
}
}
result = prepareStatement.executeUpdate();
flag = result > 0 ? true : false;
return flag;
}
/**
* 資源釋放
*/
public void releaseConn(){
if(prepareStatement != null){
try {
connection.close();
prepareStatement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
JAVA JDBC-Mysql操作類
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