TA的每日心情 衰 2021-2-2 11:21
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[LV.5]常住居民I
package s2.jsp.zhangxiao.dao;
$ g3 n/ v/ X$ v; v4 n7 S7 i /**
+ h6 @6 B" j7 y ? B0 p3 z * 实体类
) Z, E H' i g8 C * @author Administrator+ j8 Z0 _; H b- U! J
*! s, G: i5 D8 N& z0 U! t
*/
" q: O. a( [& s, T5 j& i: x public class News {
k+ V" R; Y- E9 S- M // id, title, content, pubtime, author' k# w4 t$ _$ v3 q) h6 b6 k: [
private int id;
$ y- L! j% L/ F7 U# A A& J( Q private String title;6 ~# F4 U8 x0 w- @! L! `
private String content;
, A2 C! T* b5 j+ o private String pubtime;- E' b% o6 H; @' k- ~
private String author;
# E2 C& X3 d* G# U /**
$ h* Z" @$ t+ b# b- \. Q * 构造函数
) F$ l- V# O& R * @param author 作者# \* W+ a8 n3 I9 }
* @param content 内容 H3 @& |) a3 Q* E3 M
* @param id 序号
) d9 a6 \( l! A: `0 ] * @param pubtime 发布时间, h; h, [& i/ Q2 o% a
* @param title 标题
% h* S8 t3 y4 ^; L3 v% }: K/ G */
- Y9 N: a! R8 \7 K; I5 j5 r! ~% G public News( int id,String title,String content, String pubtime,String author) {
0 |! k" {6 o' Q! t K) M1 f
1 W$ n' D+ A% o this.author = author;
' q$ E/ \# _/ w. d this.content = content;
/ r! g+ Z/ D7 d) @1 E+ X this.id = id;
: ?) y* ~+ J1 X' f0 N0 E; D6 i3 _ this.pubtime = pubtime;
& u; l: X* ^6 Z# s/ g this.title = title;! ^, I1 J8 l, W. L9 P! @1 t
}
% N; f, C( m% i! I6 ` /**9 O+ K% b) h* L1 }0 W
* 无参构造函数% \; z3 w5 m5 }5 v6 ^
*/
s: m, |+ s& T" b5 w2 I public News() {: p# f6 _! }- g( e
super();
/ J; T3 x0 Z: t+ u }
! ~- V. m- h; P /**( p( I/ K5 A9 C* X+ m9 H6 L
* get ,set
& k) `+ m" {$ [- A * @return
: n3 y( ^0 g1 {9 s2 U */. H x, `# k. j
public int getId() {. }. S8 U$ t9 j- l
return id;! k5 {8 H3 G7 ?# R$ H
}$ K$ a8 X$ O5 ]2 A3 q5 u
public void setId(int id) {
0 P# _ N7 ^* U7 Z; I4 V! S this.id = id;" F, p ^0 }( l( Y8 Y {" H2 g
}
- h+ d0 e$ { @3 p; k5 M public String getTitle() {
. h. h* d A. ~& b: t, V4 P return title;
' [( B r$ U- o# f }% _( i# e2 B/ q
public void setTitle(String title) {
& t7 m6 ~# v. ]* E7 w$ f this.title = title;6 h7 N* a) g+ L n; C: q2 `1 D
}9 U! z! w, h5 q1 g
public String getContent() {9 m) v& }* s1 T% v9 s( x& @
return content;
8 G3 _& V+ I: E2 S }; H, I; z1 `/ \! Y
public void setContent(String content) {
" `( A0 `4 _8 j) O this.content = content;
/ X2 B9 ?0 `* @( R( q% ?; | }+ }/ F8 r& u8 u5 }$ y" J
public String getPubtime() {' g* b. x5 P1 r7 U1 `6 u: {
return pubtime;3 m* X' g6 q) d' S" E+ I) d
}
; Y. s- D3 j9 C E. C public void setPubtime(String pubtime) {1 F6 `& d/ Y2 h* Z3 l
this.pubtime = pubtime;
0 m% o( G9 w1 w3 j+ }% j1 d& } }, t) @7 Q+ L+ o
public String getAuthor() {9 s' h; s; U* A& L6 x" f
return author;
' N- l5 [" y1 c# t) O }) y5 G4 c0 H4 Q D
public void setAuthor(String author) {: N5 I s6 q6 T& `7 Q
this.author = author;
$ \# C- r& w3 g. ]9 c. j. T }7 K$ F8 y: }& U; @& k4 v) n
, m7 F6 Y" P4 l6 V0 g
}
6 t9 q( Q( r7 ?- ?/ r1 s 复制代码 package s2.jsp.zhangxiao.entity;2 d2 G! ^; p9 X( Q+ P
import java .sql.PreparedStatement;3 O! Q: y6 W7 o3 a+ b. @5 y
import java.sql.DriverManager;- C6 `2 @: z) |& u8 u3 t0 }- u
import java.sql.Connection;
2 v1 V- ~7 ]& c6 E import java.sql.ResultSet;: x/ @9 t0 H5 w/ `$ Y8 ^
import java.sql.SQLException;) A3 }! Z( t) W$ ]
- C. b* R3 \$ {1 S. N5 {9 e import com.microsoft.sqlserver.jdbc.SQLServerDriver;
% f) O% g* H5 f8 N) T$ K
5 W7 i8 P' J, O7 a, q9 B/ l0 ` public class NewsBase {6 r- U9 f% K; X' u/ G
4 V( q! L9 E( u5 u& b/ ` private static final String DRIVER="com.microsoft.sqlserver.jdbc.SQLServerDriver";
- o+ G+ Q+ O9 j& g private static final String URL="jdbc:sqlserver://localhost:1433;DataBaseName=news";
. l C: z) w# `) n" A private static final String DBNAME="sa";7 t! D: Y+ G: Q( \' f6 X
private static final String DBPASS="1234";
) H( c" S3 V z' K0 S3 ]) ~
7 p8 \! d+ [, ? public Connection getConnection(){( Y1 t% j. j6 p" y4 a% n
Connection con=null;
+ ^! p' P7 m5 Z: T% {1 g try {, R8 j/ ~& y6 A E2 I' `7 A" e+ W! F5 n
Class.forName(DRIVER);
! b# d" ~- ^5 f- G0 N con=DriverManager.getConnection(URL, DBNAME, DBPASS);- R+ Z7 V* E! W( S
} catch (ClassNotFoundException e) {4 w( G# u$ C/ T1 q3 o) ]: `; N, K
System.out.println("加载驱动异常");
% c0 i- _9 a4 t* _ e.printStackTrace();
( R; _2 |9 v0 ~: _/ R' y% L, e } catch (SQLException e) {
+ a% X, F) ^5 V5 Y: |8 O System.out.println("数据库连接异常");
8 g% q' F/ T w2 i e.printStackTrace();$ ~& X7 Y( o9 U0 ~
}/ p& c# q: ~/ L5 O" q+ ?2 l
return con;
, A' T- o/ _! M- }5 H7 s }
# G6 k) ]5 m. r9 o# ]% _ 7 R; F* I! p( @0 d( e& z
public void colseAll(Connection con,PreparedStatement past,ResultSet rs){- |2 L3 t/ \5 ?! Q- B% V
try {
\" e: e3 \! k5 u rs.close();
+ {9 G6 ~8 u E$ m5 R9 b# X1 X. @% O } catch (SQLException e) {
5 I2 b- w s2 u6 X4 P System.out.println("");
. }% N7 e" R) u3 J, c( ` ^ e.printStackTrace();" ]4 `: L6 i+ n k! |- e
}& a* b( X& r7 h$ F6 I! G: C
try {
' Z0 I5 k- y6 W past.close();
& q6 V" k* z( [& p } catch (SQLException e) {: p/ |+ ~! b* B6 {0 j: S
System.out.println("");/ J: v# X0 O/ y/ n$ B
e.printStackTrace();* O# r- v& N$ J. q, o# w/ D- i1 I
}; g! P# d. k2 N; ]3 ~
try {0 ~9 N0 O# D- D. [8 K
con.close();
! v! `8 @ o3 v$ ]8 Y, O } catch (SQLException e) {
: e3 |" ~8 o& o7 a2 w; Z& N; k1 U' A // TODO Auto-generated catch block
4 ]3 q$ |; {, ]1 G e.printStackTrace();
8 j3 V. U& V+ f [) l3 N6 k' s% B }
5 M0 Y) m7 U6 ` }
4 ]0 p: T6 _7 v: r7 G: W3 ^* J
3 o Q& I W( B& F" c public int update(String sql,String[] getValues){
* Q9 ]( Q/ O; k! G3 M: Y int i=0;+ U. M$ Z* j8 s/ u, | k
Connection con=null;
9 D9 c S8 c$ Y/ D* I# U: ~: m PreparedStatement past=null;
! D3 H' _5 z- |& y con=getConnection();8 w2 ]' x$ B$ F
try {
) C3 g# v$ J! {* b5 X2 M, A past=con.prepareStatement(sql);1 A3 r/ \, j: m+ w) ~
if(getValues!=null){
8 m8 o% R2 W: h# C% `8 t for (int j = 0; j < getValues.length; j++) {
* N+ L8 p/ }/ q) p0 Q, G past.setString(j+1, getValues[j]);
& D* p q8 I: x }) H7 v! O4 o0 N$ U" D: o! c
}
! D' |/ n& Y* b/ e i=past.executeUpdate();
( l( @/ z1 W, Z5 P7 { } catch (SQLException e) {
, P5 a) u$ Y. f5 V* E/ s- Z5 y# R // TODO Auto-generated catch block4 u+ p. w( d. {" e* l( B6 w
e.printStackTrace();! a& b F7 b: Z
}" K- b2 W- a* q; ]- F
return i;
; y) M5 i3 [7 c3 G' c5 P }
' B3 {$ U8 F7 o }
7 }8 x' ?& y# E: P0 c6 H 复制代码 package s2.jsp.zhangxiao.entity;' g2 C9 A. b; J: g3 v& }$ j
; j2 }" }. E% X$ f import java.sql.Connection;3 c; }! ~& l0 x2 S O1 ~& b
import java.sql.PreparedStatement;
* n, N, }# ?4 Q" A7 J5 l8 J import java.sql.ResultSet;
, ^- t8 a8 C/ R0 C8 X$ O import java.sql.SQLException;
9 T# y7 y1 c0 p' ]0 K, X; u: o import java.util.ArrayList;
5 i9 [ e1 b- `- k- @) J import java.util.List;
9 h0 J; W! p( n2 h2 m& p2 q) j 5 x. j% K' T# x0 G: R
import s2.jsp.zhangxiao.dao.News;1 T* _" j. Q: }( u) L
) j6 y- y% g1 r7 ]4 w3 E# j6 l4 r4 e( p public class NewsDao extends NewsBase {2 F( J: h; N$ G# R0 r
private int count =2;/ M% t, [4 I/ j
; c S, q- A4 x; t. R' x1 K/ w /**
: p, u) F7 o( a* @ * 查询总页数
/ P2 @5 g" A' [# p: x& g7 K * @return0 Z- t% N/ t4 Q& z( A1 r
*/& k F& f. p9 J' s
public int countPage(){
+ o% ?+ ^2 [5 W+ p- C/ b1 C int rows=0;6 M4 Q# y! Q7 N, R( O* C! f
Connection con=null;5 F; U; |2 W9 T V/ i9 f. V
PreparedStatement past=null;
, {3 p4 z# ]( n) j7 W- c4 N ResultSet rs=null;
8 C* p. E- d3 B/ X con=getConnection();$ _' h9 ?; n, {9 d5 t
//查询所有的的页数 返回受影响的行数
( i$ f: q& L. ]* R5 E9 A String sql="select count(*)as c from news";
( \. u- u: O" a9 b% o# J5 x! F/ ^ Z try {$ V' k& `+ V- @3 ^# J
past=con.prepareStatement(sql);
" o9 H! `' n9 M( P) D( G rs=past.executeQuery();
' ^' u, |( p3 u) j" b. b" h if(rs.next()){
& w: x3 Y& ` L& Z8 F/ W //将所有的行数保存到rows 变量里. n% B4 k; w! A: ^ ?9 H; S& B
rows=rs.getInt("c");
9 C* c7 g% i. ~# @" Y //如果显示两页 count 代表显示的页数 7 v- E6 V/ {9 X0 A
if(rows%2==0){
* k8 l8 S, Z. d, e0 I: I8 P rows=rows/count;9 o# p$ v" V6 m% o
3 ]& o8 |; r' ~0 k }else{
. Y5 ]( m% W; k: A& ? ^1 | rows=rows/count+1;
6 X; [* a1 g, [/ X }( `( j& B4 u. |" H% Z
}
( U2 M" s4 v$ y$ b9 F3 K6 M" R } catch (SQLException e) {
, j+ p! C) s; C$ C System.out.println("查询总页数方法异常");
- e0 A( |1 n$ _" \" v5 A5 t% i e.printStackTrace();
# M* ^/ g5 q, l }. m. r4 B2 J1 g# K
return rows;
& U9 Y4 s5 n; U+ V# a! h }; A) F2 F! H5 _) `1 \" c, O' J
/**2 `: u' D* w9 A
* 根据id删除信息
3 m! B/ N) v+ o+ R# q ? * @param id
3 L: x% k% @* V9 a/ K * @return
4 [7 `+ M* W0 t& ]4 B */
1 m3 T* p0 F$ g! } public int deleteNewsId(int id){
4 \! R9 `6 P, V# y* z String sql="delete news where id="+id;
# ]+ V" u! ]1 B2 k H return update(sql,null);* ?. t- F9 N9 r$ D7 K, D
}
; x5 t* o+ j( C+ N5 b* s/ G( w /** ]# g8 L' Q) f6 R% J8 U, ]" x
* 根据总页数分页
2 E' b4 j* P6 M; }) O8 z6 G * @param page: o) u% ?: l2 o
* @return
+ d4 t& S: A- J4 f# ?6 i */
7 F3 ~7 U9 C+ w9 W/ p6 d+ w public List getPageList(int page){
/ [4 {7 ?7 f# v3 f) ` Connection con=null;) ^3 h# N; m; ]9 v4 I! ~2 j0 f
PreparedStatement past=null;
# n0 o* U& t1 v ResultSet rs=null;; \* Z; ]: Q7 G! b
List list=new ArrayList();
; ]; B- T8 y2 P0 U con=getConnection();
+ N; |+ z+ l2 v9 P //, ^ ]. U' d( _$ C2 X4 n
String sql="select top "+count+" * from news where id not in (select top "+(page-1)*count+" id from news order by pubtime desc )order by pubtime desc";
" o. [5 ^1 b6 P7 ~8 V1 L8 l | try {
& I T$ w( V# ^* u$ f! \/ U past=con.prepareStatement(sql);
7 j" m7 G8 f1 i rs=past.executeQuery();- d: Z9 r+ g0 \2 i/ v: V
while(rs.next()){
& c5 L( ]: F( G
" @ h" f: b9 I8 |+ L) A i // id, title, content, pubtime, author$ R5 y. j$ p% O& Q( ~+ C# [ f
int id=rs.getInt("id");3 U8 z. K+ f* q
String title=rs.getString("title");
' g+ H6 I, ^" f; W! I String content=rs.getString("content");/ l: _0 c, C+ i: _3 ?
String pubtime=rs.getString("pubtime");
) ^/ P' y% B. a( ~ String author=rs.getString("author");
7 T& Y6 D( \8 u& z News news=new News(id, title,content,pubtime,author);
) ]& Z& ^9 Q5 h* P+ ^ list.add(news);$ f2 t) t) U8 Q9 D! T! t9 n
}$ o4 g0 ?' \& E
} catch (SQLException e) {& P/ k: ]' x, r9 r; I
// TODO Auto-generated catch block; ?) `; }% j9 S# f
e.printStackTrace();$ F! c" Y. E; R
}
1 n! ]) Q3 L9 i9 i7 V2 b' V$ b/ y return list;6 i o4 C& y1 j q& }
4 ^* K+ i5 R4 @" { K
}
5 q' A! @8 U( w6 } }
' u' b3 Q$ ^- q1 A 复制代码 2 n# @" M8 h! d1 J f: }; @5 n
9 }& Z7 d+ X. {: G6 T) \/ ?4 a& J' i 源代码以及数据库下载 : ) a7 ^) p+ W5 k$ w Z
" \2 {$ F' d- G; u8 w
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