Java经典封装JDBC模板(充分体现面向对象思想)
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程序清单一览
bean类
- package com.software.usermanager.bean;
- public class Users {
- private String id;
- private String name;
- private String age;
- public String getId() {
- return id;
- }
- public void setId(String id) {
- this.id = id;
- }
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- public String getAge() {
- return age;
- }
- public void setAge(String age) {
- this.age = age;
- }
- }
package com.software.usermanager.bean;public class Users { private String id; private String name; private String age; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAge() { return age; } public void setAge(String age) { this.age = age; }}
dao类
- package com.software.usermanager.dao;
- import com.software.usermanager.bean.Users;
- import com.software.usermanager.util.PageModel;
- import java.util.List;
- public interface UsersDAO {
- public boolean insert(Users user); //增
- public boolean delete(String id); //单条删除
- public boolean delete(String[] userIds); //批量删除
- public boolean update(Users user); //修改
- public List<Users> query(); //全部查询
- public Users query(String id); //单记录查询
- public PageModel query(int pageNo, int pageSize); //分页查询
- public PageModel query(int pageNo, int pageSize,String condition); //分页模糊查询
- public boolean Login(String name,String password); //登录
- }
package com.software.usermanager.dao;import com.software.usermanager.bean.Users;import com.software.usermanager.util.PageModel;import java.util.List;public interface UsersDAO { public boolean insert(Users user); //增 public boolean delete(String id); //单条删除 public boolean delete(String[] userIds); //批量删除 public boolean update(Users user); //修改 public List<Users> query(); //全部查询 public Users query(String id); //单记录查询 public PageModel query(int pageNo, int pageSize); //分页查询 public PageModel query(int pageNo, int pageSize,String condition); //分页模糊查询 public boolean Login(String name,String password); //登录}
daoimpl类
- package com.software.usermanager.dao;
- import com.software.usermanager.util.OptTemplate;
- import java.sql.ResultSet;
- import java.util.List;
- import com.software.usermanager.bean.Users;
- import com.software.usermanager.util.*;
- public class UsersDAOImpl implements UsersDAO {
- private OptTemplate optTemplate = null;
- public UsersDAOImpl(OptTemplate optTemplate) {
- super();
- this.optTemplate = optTemplate;
- }
- public boolean Login(String name, String password) {
- // TODO Auto-generated method stub
- return false;
- }
- public boolean delete(String id) {
- String sql = “delete from users where id=?”;
- Object[] obj = { id };
- return optTemplate.update(sql, obj, false);
- }
- public boolean delete(String[] userIds) {
- StringBuffer sbStr = new StringBuffer();
- Object[] obj = userIds;
- ;
- for (int i = 0; i < userIds.length; i++) {
- sbStr.append(“?,”);
- }
- String sql = “delete from users where id in(“
- + sbStr.substring(0, sbStr.length() - 1) + ”)”;
- return optTemplate.update(sql, obj, false);
- }
- public boolean insert(Users user) {
- String sql = “insert into users(id,name,age) values(?,?,?)”;
- Object[] obj = {user.getId(),user.getName(),user.getAge()};
- return optTemplate.update(sql, obj, false);
- }
- @SuppressWarnings(“unchecked”)
- public List<Users> query() {
- String sql = “select * from users”;
- Object[] obj = {};
- return (List<Users>) optTemplate.query(sql, obj, new UsersDAOObjectMapper());
- }
- public Users query(String id) {
- String sql = “select * from users”;
- Object[] obj = {};
- return (Users) optTemplate.query(sql, obj, new UsersDAOObjectMapper()).get(0);
- }
- public PageModel query(int pageNo, int pageSize) {
- String sql1 = “select * from users”;
- Object[] obj1 = {};
- List<Users> list1 = (List<Users>) optTemplate.query(sql1, obj1,
- new UsersDAOObjectMapper());
- int i = list1.size();
- String sql=“select * from (select j.*,rownum rn from (select * from users) j where rownum<=?) where rn>?”;
- Object[] obj = {pageNo * pageSize, (pageNo - 1) * pageSize};
- List<Users> list = (List<Users>) optTemplate.query(sql, obj,
- new UsersDAOObjectMapper());
- PageModel pagemodel = new PageModel();
- pagemodel.setPageNo(pageNo);
- pagemodel.setPageSize(pageSize);
- pagemodel.setList(list);
- pagemodel.setTotalRecords(i);
- return pagemodel;
- }
- public PageModel query(int pageNo, int pageSize, String condition) {
- String sql1 = “select * from users”;
- Object[] obj1 = {};
- List<Users> list1 = (List<Users>) optTemplate.query(sql1, obj1,
- new UsersDAOObjectMapper());
- int i = list1.size();
- String sql=“select * from (select j.*,rownum rn from (select * from users where id like ’”+condition+”%’ or name like ’”+condition+”%’) j where rownum<=?) where rn>?”;
- Object[] obj = {pageNo * pageSize, (pageNo - 1) * pageSize};
- List<Users> list = (List<Users>) optTemplate.query(sql, obj,
- new UsersDAOObjectMapper());
- PageModel pagemodel = new PageModel();
- pagemodel.setPageNo(pageNo);
- pagemodel.setPageSize(pageSize);
- pagemodel.setList(list);
- pagemodel.setTotalRecords(i);
- return pagemodel;
- }
- public boolean update(Users user) {
- String sql = “update users set name=?,age=? where id=?”;
- Object[] obj = {user.getName(),user.getAge(),user.getId()};
- return optTemplate.update(sql, obj, false);
- }
- }
- class UsersDAOObjectMapper implements ObjectMapper{
- public Object mapping(ResultSet rs){
- Users u=new Users();
- try{
- u.setId(rs.getString(“id”));
- u.setName(rs.getString(“age”));
- u.setName(rs.getString(“name”));
- }catch(Exception ex){
- ex.printStackTrace();
- }
- return u;
- }
- }
package com.software.usermanager.dao;import com.software.usermanager.util.OptTemplate;import java.sql.ResultSet;import java.util.List;import com.software.usermanager.bean.Users;import com.software.usermanager.util.*;public class UsersDAOImpl implements UsersDAO { private OptTemplate optTemplate = null; public UsersDAOImpl(OptTemplate optTemplate) { super(); this.optTemplate = optTemplate; } public boolean Login(String name, String password) { // TODO Auto-generated method stub return false; } public boolean delete(String id) { String sql = "delete from users where id=?"; Object[] obj = { id }; return optTemplate.update(sql, obj, false); } public boolean delete(String[] userIds) { StringBuffer sbStr = new StringBuffer(); Object[] obj = userIds; ; for (int i = 0; i < userIds.length; i++) { sbStr.append("?,"); } String sql = "delete from users where id in(" + sbStr.substring(0, sbStr.length() - 1) + ")"; return optTemplate.update(sql, obj, false); } public boolean insert(Users user) { String sql = "insert into users(id,name,age) values(?,?,?)"; Object[] obj = {user.getId(),user.getName(),user.getAge()}; return optTemplate.update(sql, obj, false); } @SuppressWarnings("unchecked") public List<Users> query() { String sql = "select * from users"; Object[] obj = {}; return (List<Users>) optTemplate.query(sql, obj, new UsersDAOObjectMapper()); } public Users query(String id) { String sql = "select * from users"; Object[] obj = {}; return (Users) optTemplate.query(sql, obj, new UsersDAOObjectMapper()).get(0); } public PageModel query(int pageNo, int pageSize) { String sql1 = "select * from users"; Object[] obj1 = {}; List<Users> list1 = (List<Users>) optTemplate.query(sql1, obj1, new UsersDAOObjectMapper()); int i = list1.size(); String sql="select * from (select j.*,rownum rn from (select * from users) j where rownum<=?) where rn>?"; Object[] obj = {pageNo * pageSize, (pageNo - 1) * pageSize}; List<Users> list = (List<Users>) optTemplate.query(sql, obj, new UsersDAOObjectMapper()); PageModel pagemodel = new PageModel(); pagemodel.setPageNo(pageNo); pagemodel.setPageSize(pageSize); pagemodel.setList(list); pagemodel.setTotalRecords(i); return pagemodel; } public PageModel query(int pageNo, int pageSize, String condition) { String sql1 = "select * from users"; Object[] obj1 = {}; List<Users> list1 = (List<Users>) optTemplate.query(sql1, obj1, new UsersDAOObjectMapper()); int i = list1.size(); String sql="select * from (select j.*,rownum rn from (select * from users where id like '"+condition+"%' or name like '"+condition+"%') j where rownum<=?) where rn>?"; Object[] obj = {pageNo * pageSize, (pageNo - 1) * pageSize}; List<Users> list = (List<Users>) optTemplate.query(sql, obj, new UsersDAOObjectMapper()); PageModel pagemodel = new PageModel(); pagemodel.setPageNo(pageNo); pagemodel.setPageSize(pageSize); pagemodel.setList(list); pagemodel.setTotalRecords(i); return pagemodel; } public boolean update(Users user) { String sql = "update users set name=?,age=? where id=?"; Object[] obj = {user.getName(),user.getAge(),user.getId()}; return optTemplate.update(sql, obj, false); }}class UsersDAOObjectMapper implements ObjectMapper{ public Object mapping(ResultSet rs){ Users u=new Users(); try{ u.setId(rs.getString("id")); u.setName(rs.getString("age")); u.setName(rs.getString("name")); }catch(Exception ex){ ex.printStackTrace(); } return u; }}
util类
- package com.software.usermanager.util;
- import java.sql.Connection;
- import java.sql.PreparedStatement;
- import java.sql.ResultSet;
- import java.sql.SQLException;
- import java.sql.Statement;
- import java.util.ArrayList;
- import java.util.List;
- import com.software.usermanager.db.DBConnection;
- public class OptTemplate {
- public Object find(String sql,Object[] obj,ObjectMapper mapper){
- Object o=null;
- Connection conn=null;
- PreparedStatement pstmt=null;
- try{
- conn=DBConnection.getConn();
- pstmt=conn.prepareStatement(sql);
- for(int i=0;i<obj.length;i++){
- pstmt.setObject(i+1, obj[i]);
- ResultSet rs=pstmt.executeQuery();
- if(rs.next()){
- o=mapper.mapping(rs);
- }
- }
- }catch(Exception ex){
- ex.printStackTrace();
- }finally{
- try{
- pstmt.close();
- conn.close();
- }catch(SQLException ex){
- ex.printStackTrace();
- }
- }
- return o;
- }
- public List<? extends Object> query(String sql,Object[] obj,ObjectMapper mapper){
- Object o=null;
- List<Object> list=new ArrayList<Object>();
- Connection conn=null;
- PreparedStatement pstmt=null;
- try{
- conn=DBConnection.getConn();
- pstmt=conn.prepareStatement(sql);
- for(int i=0;i<obj.length;i++){
- pstmt.setObject(i+1, obj[i]);
- }
- ResultSet rs=pstmt.executeQuery();
- while(rs.next()){
- o=mapper.mapping(rs);
- list.add(o);
- }
- }catch(SQLException ex){
- ex.printStackTrace();
- }finally{
- try{
- pstmt.close();
- conn.close();
- }catch(SQLException ex){
- ex.printStackTrace();
- }
- }
- return list;
- }
- public boolean update(String sql,Object[] obj,boolean isGenerateKey){
- Connection conn=null;
- PreparedStatement pstmt=null;
- boolean bFlag=false;
- try{
- conn=DBConnection.getConn();
- pstmt=isGenerateKey ? conn.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS):conn.prepareStatement(sql);
- for(int i=0;i<obj.length;i++){
- pstmt.setObject(i+1, obj[i]);
- }
- conn.setAutoCommit(false);
- int i=pstmt.executeUpdate();
- conn.commit();
- if(i>0)
- bFlag=true;
- }catch(SQLException ex){
- ex.printStackTrace();
- }finally{
- try{
- conn.close();
- pstmt.close();
- }catch(SQLException ex){
- ex.printStackTrace();
- }
- }
- return bFlag;
- }
- }
package com.software.usermanager.util;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.ArrayList;import java.util.List;import com.software.usermanager.db.DBConnection;public class OptTemplate { public Object find(String sql,Object[] obj,ObjectMapper mapper){ Object o=null; Connection conn=null; PreparedStatement pstmt=null; try{ conn=DBConnection.getConn(); pstmt=conn.prepareStatement(sql); for(int i=0;i<obj.length;i++){ pstmt.setObject(i+1, obj[i]); ResultSet rs=pstmt.executeQuery(); if(rs.next()){ o=mapper.mapping(rs); } } }catch(Exception ex){ ex.printStackTrace(); }finally{ try{ pstmt.close(); conn.close(); }catch(SQLException ex){ ex.printStackTrace(); } } return o; } public List<? extends Object> query(String sql,Object[] obj,ObjectMapper mapper){ Object o=null; List<Object> list=new ArrayList<Object>(); Connection conn=null; PreparedStatement pstmt=null; try{ conn=DBConnection.getConn(); pstmt=conn.prepareStatement(sql); for(int i=0;i<obj.length;i++){ pstmt.setObject(i+1, obj[i]); } ResultSet rs=pstmt.executeQuery(); while(rs.next()){ o=mapper.mapping(rs); list.add(o); } }catch(SQLException ex){ ex.printStackTrace(); }finally{ try{ pstmt.close(); conn.close(); }catch(SQLException ex){ ex.printStackTrace(); } } return list; } public boolean update(String sql,Object[] obj,boolean isGenerateKey){ Connection conn=null; PreparedStatement pstmt=null; boolean bFlag=false; try{ conn=DBConnection.getConn(); pstmt=isGenerateKey ? conn.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS):conn.prepareStatement(sql); for(int i=0;i<obj.length;i++){ pstmt.setObject(i+1, obj[i]); } conn.setAutoCommit(false); int i=pstmt.executeUpdate(); conn.commit(); if(i>0) bFlag=true; }catch(SQLException ex){ ex.printStackTrace(); }finally{ try{ conn.close(); pstmt.close(); }catch(SQLException ex){ ex.printStackTrace(); } } return bFlag; }}
分页封装类
- package com.software.usermanager.util;
- import java.util.List;
- public class PageModel<T> {
- //结果集
- private List<T> list;
- //记录数
- private int totalRecords;
- //每页多少条数据
- private int pageSize;
- //第几页
- private int pageNo;
- /**
- * 返回总页数
- * @return
- */
- public int getTotalPages() {
- return (totalRecords + pageSize - 1) / pageSize;
- }
- /**
- * 首页
- * @return
- */
- public int getTopPageNo() {
- return 1;
- }
- /**
- * 上一页
- * @return
- */
- public int getPreviousPageNo() {
- if (this.pageNo <= 1) {
- return 1;
- }
- return this.pageNo - 1;
- }
- /**
- * 下一页
- * @return
- */
- public int getNextPageNo() {
- if (this.pageNo >= getButtomPageNo()) {
- return getButtomPageNo();
- }
- return this.pageNo + 1;
- }
- /**
- * 尾页
- * @return
- */
- public int getButtomPageNo() {
- return getTotalPages();
- }
- public List<T> getList() {
- return list;
- }
- public void setList(List<T> list) {
- this.list = list;
- }
- public int getTotalRecords() {
- return totalRecords;
- }
- public void setTotalRecords(int totalRecords) {
- this.totalRecords = totalRecords;
- }
- public int getPageSize() {
- return pageSize;
- }
- public void setPageSize(int pageSize) {
- this.pageSize = pageSize;
- }
- public int getPageNo() {
- return pageNo;
- }
- public void setPageNo(int pageNo) {
- this.pageNo = pageNo;
- }
- }
package com.software.usermanager.util;import java.util.List;public class PageModel<T> { //结果集 private List<T> list; //记录数 private int totalRecords; //每页多少条数据 private int pageSize; //第几页 private int pageNo; /** * 返回总页数 * @return */ public int getTotalPages() { return (totalRecords + pageSize - 1) / pageSize; } /** * 首页 * @return */ public int getTopPageNo() { return 1; } /** * 上一页 * @return */ public int getPreviousPageNo() { if (this.pageNo <= 1) { return 1; } return this.pageNo - 1; } /** * 下一页 * @return */ public int getNextPageNo() { if (this.pageNo >= getButtomPageNo()) { return getButtomPageNo(); } return this.pageNo + 1; } /** * 尾页 * @return */ public int getButtomPageNo() { return getTotalPages(); } public List<T> getList() { return list; } public void setList(List<T> list) { this.list = list; } public int getTotalRecords() { return totalRecords; } public void setTotalRecords(int totalRecords) { this.totalRecords = totalRecords; } public int getPageSize() { return pageSize; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public int getPageNo() { return pageNo; } public void setPageNo(int pageNo) { this.pageNo = pageNo; }}
数据库配置文件dbconf.properties
- #oracle连接实例
- driverClass = oracle.jdbc.driver.OracleDriver
- url = jdbc:oracle:thin:@192.168.137.23:1521:orcl
- username = 用户名
- password = 密码
#oracle连接实例 driverClass = oracle.jdbc.driver.OracleDriver url = jdbc:oracle:thin:@192.168.137.23:1521:orcl username = 用户名 password = 密码
数据库封装类
- package com.software.usermanager.db;
- import java.io.IOException;
- import java.sql.Connection;
- import java.sql.DriverManager;
- import java.sql.SQLException;
- import java.util.Properties;
- public class DBConnection {
- private static Connection conn = null;
- private static Properties props = null;
- static {
- props = new Properties();
- try {
- props.load(DBConnection.class.getResourceAsStream(“/dbconf.properties”));
- } catch (IOException e1) {
- e1.printStackTrace();
- }
- try {
- Class.forName(props.getProperty(“driverClass”));
- } catch (ClassNotFoundException e) {
- e.printStackTrace();
- }
- }
- public static Connection getConn(){
- try {
- conn = DriverManager.getConnection(props.getProperty(“url”), props.getProperty(“username”), props.getProperty(“password”));
- conn.setAutoCommit(false);
- } catch (SQLException e) {
- e.printStackTrace();
- }
- return conn;
- }
- public void closeConn(){
- try {
- if (conn != null)
- conn.close();
- } catch (SQLException e) {
- e.printStackTrace();
- }
- }
- }
package com.software.usermanager.db;import java.io.IOException;import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;import java.util.Properties;public class DBConnection { private static Connection conn = null; private static Properties props = null; static { props = new Properties(); try { props.load(DBConnection.class.getResourceAsStream("/dbconf.properties")); } catch (IOException e1) { e1.printStackTrace(); } try { Class.forName(props.getProperty("driverClass")); } catch (ClassNotFoundException e) { e.printStackTrace(); } } public static Connection getConn(){ try { conn = DriverManager.getConnection(props.getProperty("url"), props.getProperty("username"), props.getProperty("password")); conn.setAutoCommit(false); } catch (SQLException e) { e.printStackTrace(); } return conn; } public void closeConn(){ try { if (conn != null) conn.close(); } catch (SQLException e) { e.printStackTrace(); } }}
junit测试类
- package com.software.usermanager.test;
- import java.util.List;
- import com.software.usermanager.bean.Users;
- import org.apache.tomcat.jni.User;
- import org.junit.After;
- import org.junit.Before;
- import org.junit.Test;
- import com.software.usermanager.dao.UsersDAO;
- import com.software.usermanager.dao.UsersDAOImpl;
- import com.software.usermanager.db.DBConnection;
- import com.software.usermanager.util.OptTemplate;
- import com.software.usermanager.util.PageModel;
- public class UserTest {
- DBConnection dbConn = null;
- @Before
- public void setUp() {
- dbConn = new DBConnection();
- }
- @After
- public void tearDown() {
- dbConn.closeConn();
- }
- /************测试插入记录***************/
- // @Test
- // public void testinsert() {
- // UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
- // for(int i=0;i<20;i++){
- // Users u = new Users();
- // u.setId(“”+i);
- // u.setName(“郑六”);
- // u.setAge(“2”+i);
- // boolean b=usersdao.insert(u);
- // if(b==false){
- // System.out.println(“插入失败”);
- // }else{
- // System.out.println(“插入成功”);
- // }}
- //
- //
- // }
- /************测试修改记录***************/
- // @Test
- // public void testupdate() {
- // UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
- // Users u = new Users();
- // u.setId(“5”);
- // u.setName(“郑六”);
- // u.setAge(“21”);
- // boolean b=usersdao.update(u);
- // if(b==false){
- // System.out.println(“更新失败”);
- // }else{
- // System.out.println(“更新成功”);
- // }
- //
- //
- // }
- /************测试删除单条记录***************/
- // @Test
- // public void testdeleteById() {
- // UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
- // boolean b=usersdao.delete(“2”);
- // if(b==false){
- // System.out.println(“删除失败”);
- // }else{
- // System.out.println(“删除成功”);
- // }
- //
- // }
- /************测试批量删除记录***************/
- //
- // @Test
- // public void testdeleteByArray() {
- // UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
- // String[] s={“3”,”4”,”5”};
- // boolean b=usersdao.delete(s);
- // if(b==false){
- // System.out.println(“删除失败”);
- // }else{
- // System.out.println(“删除成功”);
- // }
- //
- // }
- /*********查询全部记录结果集为泛型 ************/
- // @Test
- // public void testqueryAll(){
- // UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
- // List<Users> list=usersdao.query();
- // for(Users u:list){
- // System.out.println(u.getId());
- // }
- // }
- /*********查询单条记录结果集为对象 ************/
- // @Test
- // public void testqueryAll(){
- // UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
- // Users u=usersdao.query(“7”);
- // System.out.println(u.getName());
- //
- // }
- // /*********分页查询全部记录结果集为pagemodel************/
- // @Test
- // public void testqueryAll(){
- // UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
- // PageModel pml=usersdao.query(2,2);
- // List<Users> list=pml.getList();
- // for(Users u:list){
- // System.out.println(u.getId());
- // }
- // }
- /*********分页模糊查询全部记录结果集为pagemodel************/
- @Test
- public void testqueryAll(){
- UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
- PageModel pml=usersdao.query(1,2,”2”);
- List<Users> list=pml.getList();
- for(Users u:list){
- System.out.println(u.getId());
- }
- }
- }
package com.software.usermanager.test;import java.util.List;import com.software.usermanager.bean.Users;import org.apache.tomcat.jni.User;import org.junit.After;import org.junit.Before;import org.junit.Test;import com.software.usermanager.dao.UsersDAO;import com.software.usermanager.dao.UsersDAOImpl;import com.software.usermanager.db.DBConnection;import com.software.usermanager.util.OptTemplate;import com.software.usermanager.util.PageModel;public class UserTest { DBConnection dbConn = null; @Before public void setUp() { dbConn = new DBConnection(); } @After public void tearDown() { dbConn.closeConn(); } /************测试插入记录***************/// @Test// public void testinsert() {// UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());// for(int i=0;i<20;i++){// Users u = new Users();// u.setId(""+i);// u.setName("郑六");// u.setAge("2"+i);// boolean b=usersdao.insert(u);// if(b==false){// System.out.println("插入失败");// }else{// System.out.println("插入成功");// }}// //// } /************测试修改记录***************/// @Test// public void testupdate() {// UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());// Users u = new Users();// u.setId("5");// u.setName("郑六");// u.setAge("21");// boolean b=usersdao.update(u);// if(b==false){// System.out.println("更新失败");// }else{// System.out.println("更新成功");// }// //// } /************测试删除单条记录***************/// @Test// public void testdeleteById() {// UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());// boolean b=usersdao.delete("2");// if(b==false){// System.out.println("删除失败");// }else{// System.out.println("删除成功");// }// // } /************测试批量删除记录***************///// @Test// public void testdeleteByArray() {// UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());// String[] s={"3","4","5"};// boolean b=usersdao.delete(s);// if(b==false){// System.out.println("删除失败");// }else{// System.out.println("删除成功");// }// // } /*********查询全部记录结果集为泛型 ************/// @Test// public void testqueryAll(){// UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());// List<Users> list=usersdao.query();// for(Users u:list){// System.out.println(u.getId());// }// } /*********查询单条记录结果集为对象 ************/// @Test// public void testqueryAll(){// UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());// Users u=usersdao.query("7");// System.out.println(u.getName());// // }// /*********分页查询全部记录结果集为pagemodel************/// @Test// public void testqueryAll(){// UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());// PageModel pml=usersdao.query(2,2);// List<Users> list=pml.getList();// for(Users u:list){// System.out.println(u.getId());// }// } /*********分页模糊查询全部记录结果集为pagemodel************/ @Test public void testqueryAll(){ UsersDAO usersdao = new UsersDAOImpl(new OptTemplate()); PageModel pml=usersdao.query(1,2,"2"); List<Users> list=pml.getList(); for(Users u:list){ System.out.println(u.getId()); } }}
注意:以下代码非本程序必须代码,仅供自己笔记之用
Filter
- package com.software.usermanager.filter;
- import java.io.IOException;
- import javax.servlet.Filter;
- import javax.servlet.FilterChain;
- import javax.servlet.FilterConfig;
- import javax.servlet.ServletException;
- import javax.servlet.ServletRequest;
- import javax.servlet.ServletResponse;
- public class FilterEncoding implements Filter {
- private String encoding = “utf-8”;
- public void destroy() {
- }
- public void doFilter(ServletRequest request, ServletResponse response,
- FilterChain arg2) throws IOException, ServletException {
- request.setCharacterEncoding(encoding);
- response.setCharacterEncoding(encoding);
- arg2.doFilter(request, response);
- }
- public void init(FilterConfig arg0) throws ServletException {
- encoding = arg0.getInitParameter(“encoding”);
- }
- }
package com.software.usermanager.filter;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse; public class FilterEncoding implements Filter { private String encoding = "utf-8"; public void destroy() { } public void doFilter(ServletRequest request, ServletResponse response, FilterChain arg2) throws IOException, ServletException { request.setCharacterEncoding(encoding); response.setCharacterEncoding(encoding); arg2.doFilter(request, response); } public void init(FilterConfig arg0) throws ServletException { encoding = arg0.getInitParameter("encoding"); } }Listener
- package com.software.usermanager.listener;
- import java.util.Date;
- import javax.servlet.ServletContextEvent;
- import javax.servlet.ServletContextListener;
- public class Listener implements ServletContextListener
- {
- public void contextDestroyed(ServletContextEvent event)
- {
- // 销毁记录
- }
- public void contextInitialized(ServletContextEvent event)
- {
- // 记录登录信息
- Date date = new Date();
- event.getServletContext().log(date.toString());
- }
- }
package com.software.usermanager.listener;import java.util.Date;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;public class Listener implements ServletContextListener { public void contextDestroyed(ServletContextEvent event) { // 销毁记录 } public void contextInitialized(ServletContextEvent event) { // 记录登录信息 Date date = new Date(); event.getServletContext().log(date.toString()); }}
web.xml配置文件
- <?xml version=“1.0” encoding=“UTF-8”?>
- <web-app id=“WebApp_ID” version=“2.4” xmlns=“http://java.sun.com/xml/ns/j2ee” xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation=“http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd”>
- <display-name>xkxt</display-name>
- <welcome-file-list>
- <welcome-file>index.jsp</welcome-file>
- </welcome-file-list>
- <filter>
- <filter-name>Encoding</filter-name>
- <filter-class>com.software.usermanager.FilterEncoding</filter-class>
- <init-param>
- <param-name>encoding</param-name>
- <param-value>UTF-8</param-value>
- </init-param>
- </filter>
- <filter-mapping>
- <filter-name>Encoding</filter-name>
- <url-pattern>/*</url-pattern>
- </filter-mapping>
- <listener>
- <listener-class>com.software.usermanager.Listener</listener-class>
- </listener>
- <servlet>
- <servlet-name>xkxt</servlet-name>
- <servlet-class>com.software.usermanager.XKXTServlet</servlet-class>
- </servlet>
- <servlet-mapping>
- <servlet-name>xkxt</servlet-name>
- <url-pattern>/action</url-pattern>
- </servlet-mapping>
- <servlet>
- <servlet-name>querydqm</servlet-name>
- <servlet-class>com.software.usermanager.DQMServlet</servlet-class>
- </servlet>
- <servlet-mapping>
- <servlet-name>querydqm</servlet-name>
- <url-pattern>/action</url-pattern>
- </servlet-mapping>
- </web-app>
<?xml version="1.0" encoding="UTF-8"?><web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>xkxt</display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>Encoding</filter-name> <filter-class>com.software.usermanager.FilterEncoding</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>Encoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <listener> <listener-class>com.software.usermanager.Listener</listener-class> </listener> <servlet> <servlet-name>xkxt</servlet-name> <servlet-class>com.software.usermanager.XKXTServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>xkxt</servlet-name> <url-pattern>/action</url-pattern> </servlet-mapping> <servlet> <servlet-name>querydqm</servlet-name> <servlet-class>com.software.usermanager.DQMServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>querydqm</servlet-name> <url-pattern>/action</url-pattern> </servlet-mapping></web-app>
dao类
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Markdown及扩展
Markdown 是一种轻量级标记语言,它允许人们使用易读易写的纯文本格式编写文档,然后转换成格式丰富的HTML页面。 —— [ 维基百科 ]
使用简单的符号标识不同的标题,将某些文字标记为粗体或者斜体,创建一个链接等,详细语法参考帮助?。
本编辑器支持 Markdown Extra , 扩展了很多好用的功能。具体请参考Github.
表格
Markdown Extra 表格语法:
可以使用冒号来定义对齐方式:
定义列表
- Markdown Extra 定义列表语法:
- 项目1
- 项目2
- 定义 A
- 定义 B
- 项目3
- 定义 C
定义 D
定义D内容
代码块
代码块语法遵循标准markdown代码,例如:
@requires_authorizationdef somefunc(param1='', param2=0): '''A docstring''' if param1 > param2: # interesting print 'Greater' return (param2 - param1 + 1) or Noneclass SomeClass: pass>>> message = '''interpreter... prompt'''
脚注
生成一个脚注1.
目录
用 [TOC]
来生成目录:
- Markdown及扩展
- 表格
- 定义列表
- 代码块
- 脚注
- 目录
- 数学公式
- UML 图
- 离线写博客
- 浏览器兼容
- Markdown及扩展
数学公式
使用MathJax渲染LaTex 数学公式,详见math.stackexchange.com.
- 行内公式,数学公式为:
Γ(n)=(n−1)!∀n∈N 。 - 块级公式:
更多LaTex语法请参考 这儿.
UML 图:
可以渲染序列图:
或者流程图:
- 关于 序列图 语法,参考 这儿,
- 关于 流程图 语法,参考 这儿.
离线写博客
即使用户在没有网络的情况下,也可以通过本编辑器离线写博客(直接在曾经使用过的浏览器中输入write.blog.csdn.net/mdeditor即可。Markdown编辑器使用浏览器离线存储将内容保存在本地。
用户写博客的过程中,内容实时保存在浏览器缓存中,在用户关闭浏览器或者其它异常情况下,内容不会丢失。用户再次打开浏览器时,会显示上次用户正在编辑的没有发表的内容。
博客发表后,本地缓存将被删除。
用户可以选择 把正在写的博客保存到服务器草稿箱,即使换浏览器或者清除缓存,内容也不会丢失。
注意:虽然浏览器存储大部分时候都比较可靠,但为了您的数据安全,在联网后,请务必及时发表或者保存到服务器草稿箱。
浏览器兼容
- 目前,本编辑器对Chrome浏览器支持最为完整。建议大家使用较新版本的Chrome。
- IE9以下不支持
- IE9,10,11存在以下问题
- 不支持离线功能
- IE9不支持文件导入导出
- IE10不支持拖拽文件导入
- 这里是 脚注 的 内容. ↩
0 0
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