TA的每日心情 衰 2021-2-2 11:21
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package s2.jsp.zhangxiao.dao;! B+ x4 O. X" l: v
/**
* `% L/ M3 l- o9 G" R6 Y8 U3 I. T4 m * 实体类7 o4 L# }, l0 G4 Z( C& \/ z
* @author Administrator
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*/0 W9 w1 ~+ o- x. Z9 K
public class News {3 R6 x0 W- C5 f
// id, title, content, pubtime, author& Q: Q( t7 K) D' Q* K
private int id;
3 H8 u0 E S# e& J private String title;
& q" M. c! ~& C1 R private String content;
* r5 [2 E0 m" G3 @ private String pubtime;
9 b0 e1 a0 s0 b7 m" {0 l private String author;! f7 g) y& O4 J9 n
/**3 o0 Q3 O& E& I( v' e. z+ e
* 构造函数' U, `9 n! r. a) k. D
* @param author 作者/ _! x+ x7 H* ~/ I- w T8 m2 I
* @param content 内容
) W5 x0 u% T7 J" S6 g * @param id 序号3 z' ?1 L) W! q
* @param pubtime 发布时间
. [: e4 p' O! }/ w" r, f0 p3 c K * @param title 标题
$ u+ _0 b) {( F3 [! g8 ~& O */
3 S2 Z7 j' R* }) Z3 s- A1 R& x- ] public News( int id,String title,String content, String pubtime,String author) {0 Q+ x, @: X) \5 e. V2 ^
# {$ P( K: F6 U1 O* C% f this.author = author;
5 }& Q8 a* O' ^/ K5 X this.content = content;
1 a1 g/ K" @9 Y1 M$ q! n: U this.id = id;1 t" ]! B& N, |' r8 r/ P" O
this.pubtime = pubtime; U _/ @$ l+ y+ d0 L! \1 o- @. G/ ^
this.title = title;
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/** z. E" k; F8 y9 B" C1 |6 x6 `( [
* 无参构造函数
# a( C) l; Y# `1 Q; |, N */6 d9 E3 J% G, `) w
public News() {
: \4 l8 V& A, I6 Q' q/ l super();4 C' z. X( ~$ U; \
}
3 p1 Q1 @5 Q% z- a' G/ d: r' Q /**4 V- p7 F+ W, c4 z
* get ,set f. X6 \2 [ V3 E/ s$ y. X P* N
* @return
) E: h* b! e8 W7 {( A */
: a* K0 y; m1 D0 f8 { public int getId() {
/ G5 O: M& e# V2 e$ y) C return id;( B, _" C0 [ @' m4 Y- ]8 r
}8 b# S' ~; _0 `1 T% x0 ?3 x
public void setId(int id) {+ S2 c" G. g: _/ l
this.id = id;0 }6 e" N8 `, d5 f$ p3 u( ~+ F& I q
}
) [! q j8 f5 T, I& b% Z public String getTitle() {
; u' _2 e% Y2 w E" V1 t" w, \ return title;* O- p8 H4 O7 b1 h7 F* ], Y
}
8 Z" ^9 m: K; X W: n public void setTitle(String title) {% Z7 Q+ J+ g6 X6 D- _" a; c8 {2 J
this.title = title;
$ ?( H2 S' g, K @$ f$ v0 g }
" a8 s3 C7 u/ o: M6 _* I public String getContent() {
6 \# q) T5 i3 z' E9 M- ? return content;. N" f% l8 W( z# L
}& i3 O R' ]9 o% u1 E; W) C0 C
public void setContent(String content) {
2 \; `# }& \* q3 s* c this.content = content;( p% C) m. b D9 I# p# e, m
}
_& ^& E X% |* S1 p public String getPubtime() {
) n0 k/ n$ |' h% D- `! ] return pubtime;
( K$ q8 N: T/ t1 r" | N V }
6 M+ O6 b0 @) R' {' I* w public void setPubtime(String pubtime) {* w: J$ B' A% _ r
this.pubtime = pubtime;! b4 J* L( K+ X' w( a# ~
}
9 h) [9 m" D8 E9 R# @. b) D" } public String getAuthor() {: q3 E7 H# T. S* H) z! [$ l
return author;
* i6 X9 o1 Z! s6 T; F$ Q }% h5 i( M$ E i# G' {
public void setAuthor(String author) {. z# X. M; o' g) X5 r
this.author = author;
' P6 ^& d9 l; V7 K3 H3 n/ v }
8 ^" V" Y) f% z
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复制代码 package s2.jsp.zhangxiao.entity;
z$ c# i2 N) A) @8 _% p5 S import java .sql.PreparedStatement;; l- E% j4 F+ c# C" p
import java.sql.DriverManager;& M7 A3 F8 y6 g9 q# b* [
import java.sql.Connection;
* ?( q8 x B5 }* f8 p8 P4 E: S, u import java.sql.ResultSet;% q* u4 C1 o+ F2 z" Y9 z
import java.sql.SQLException;2 S5 Y' \6 M+ a2 O5 k( f8 D
: O6 c( j1 Q# j% S5 A2 X import com.microsoft.sqlserver.jdbc.SQLServerDriver;3 C0 w9 B0 ^: ^* o% B( [
: B+ y! Z, w! l& P# V public class NewsBase {
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private static final String DRIVER="com.microsoft.sqlserver.jdbc.SQLServerDriver";' k. f% h& w2 g Z
private static final String URL="jdbc:sqlserver://localhost:1433;DataBaseName=news";; ?4 F0 s1 o! ~) j2 o
private static final String DBNAME="sa";
) f& k2 r5 B ]# D- p( b private static final String DBPASS="1234";$ q9 X9 X0 c* T& c9 S( C7 _
# l2 G2 m/ l: Z+ K# U/ {2 {( Y3 m0 y public Connection getConnection(){5 X) S* {# l, d" h
Connection con=null;
; g$ w( }6 [: G: q3 z, E try {
6 p3 f4 p3 n' |' p( B$ r; O- q Class.forName(DRIVER);4 d4 g1 E9 v1 G
con=DriverManager.getConnection(URL, DBNAME, DBPASS);5 L; q' \: |, ?* w4 J! l+ L( N1 d
} catch (ClassNotFoundException e) {
" t. R& u; Y5 t2 t- c) r System.out.println("加载驱动异常");
+ C1 I, G- J8 I& o- x) s e.printStackTrace();( _% ~8 \# m3 z t
} catch (SQLException e) {
, {" c+ o) z0 [# G( _% l System.out.println("数据库连接异常");
6 {( h9 a8 [4 B! V. P4 ~. g e.printStackTrace();
9 g* D% K+ Z! g; \6 K }
$ j3 f. S+ J5 ~+ B return con;" [7 t" Z( @' J# w) {
}
/ I: x, Z% ~* I$ ?2 g% E
8 u- O( d+ n( K6 U' z2 q public void colseAll(Connection con,PreparedStatement past,ResultSet rs){
3 B- a3 P) o# J+ l5 R' i try {
2 D! h8 j0 W) Y; V% ]" H rs.close();
- r( d- e% m% P5 D j& B; r [ } catch (SQLException e) {
4 x: K8 B: {1 B6 X! _ System.out.println("");! v( r+ p* x/ j* |5 d* _
e.printStackTrace();
I m: [/ w6 s( u: F }
$ j' b, E. N: a try {7 O( O; U- K7 x3 Q% y! R
past.close();
- X8 P/ a7 S i } catch (SQLException e) {9 e# \6 b/ [7 W6 C, C5 R) v7 ?
System.out.println("");4 Q& J" F' T1 ~
e.printStackTrace();9 r# }- x/ a/ m8 | M, |, v
}; V: `4 ?( X4 U4 x# z# b
try {
: S. a7 b+ r2 i. [0 L6 x+ t+ R con.close();
% R2 B# N- r+ g8 t* G9 G } catch (SQLException e) {
! s0 e& r5 x( k0 q4 h2 C5 ] // TODO Auto-generated catch block" w* }# I7 G5 x* R9 B% [! F
e.printStackTrace();
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}: d* b; b9 M, K& {
# e) S2 Z% z8 Y4 l4 ~( J public int update(String sql,String[] getValues){! K, g; w/ R5 R2 ^8 ^) F6 _. K
int i=0;
. E4 @0 V6 j2 ?/ p2 n Connection con=null;
8 M, b! d! U5 O+ u* a PreparedStatement past=null;; {- |3 W, w+ K$ A7 X) e2 Z
con=getConnection(); D3 K% J% w y3 d, a: {
try {
0 D: H# C, _- ]- s$ q) j past=con.prepareStatement(sql);
; N k) U; H) z0 J( W: I5 r if(getValues!=null){
: O1 K% A4 w/ U for (int j = 0; j < getValues.length; j++) {
7 g2 {3 F' E) E9 B0 l, o past.setString(j+1, getValues[j]);
C/ X y0 ?; X7 H, ]) L }
: n0 ?8 K6 _9 H6 _% u8 L0 T }
7 u: S; \/ c6 J i=past.executeUpdate();- D5 }9 m; k* L7 F3 ~9 t, w
} catch (SQLException e) {4 C8 h8 h( r) F/ E
// TODO Auto-generated catch block. U: A* ^: D; @# A8 H- `3 c7 i
e.printStackTrace();
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return i;( q8 i& s( C/ c$ E
}
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复制代码 package s2.jsp.zhangxiao.entity;
/ ^5 z6 G5 ]0 G% `) _
7 [) ]$ W0 }: D- n import java.sql.Connection;
( v) K. G+ `: M! L import java.sql.PreparedStatement;; m0 d) b5 ]5 H; D% S) X
import java.sql.ResultSet;8 `; {, |; z' P) t5 ]1 | w1 F
import java.sql.SQLException;+ \5 W+ g# [6 P. d( [9 m0 C- k+ v
import java.util.ArrayList;
8 R2 X! z7 Y {1 b3 J- D import java.util.List;. Y+ J r, o! g7 B/ Y# X
1 D: Z+ ?) c5 u& X8 `0 \ import s2.jsp.zhangxiao.dao.News;) } W: Z% e' ?2 `5 P
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public class NewsDao extends NewsBase {; r* F$ T" A6 A
private int count =2;0 W' H6 L* ]8 Z8 G9 z, b/ r
1 T6 Y# Q) K q4 c7 o: n /**
- D0 \ H2 W& ]* `: E+ J * 查询总页数; {- q" K8 N/ I# k& B1 ]3 Y( F
* @return
2 m: s1 H* u) h8 @" m */7 f) W+ ~) V* D3 o7 z% P0 b
public int countPage(){
: X' n: N* y4 n% n! e; q4 F int rows=0;
4 a& P2 o" V% x3 M3 W Connection con=null;! I; b3 w6 s9 ~: h* I
PreparedStatement past=null;& m5 x6 e% ]' a O9 `# g
ResultSet rs=null;; b$ M8 q8 z* D( _3 Z1 F$ ?3 w
con=getConnection();
W, I: P4 z1 W6 L0 o. j* X //查询所有的的页数 返回受影响的行数+ |/ x/ Z6 i' N1 h& P
String sql="select count(*)as c from news";' Y" M, I6 d* f
try {) U( \8 l! B* ~, g* W" O0 Y! l
past=con.prepareStatement(sql);
# m3 z' @: Q0 } rs=past.executeQuery();
/ O0 A. F' ?. e; w7 f" I if(rs.next()){
1 A) _( m9 i% c! }+ y. T //将所有的行数保存到rows 变量里
# ^0 J2 |8 b. S2 e rows=rs.getInt("c");
& G$ g0 K3 c/ U* z7 B1 n6 y //如果显示两页 count 代表显示的页数
& Q T5 O3 K% O if(rows%2==0){0 a& j2 j+ G0 }8 O g% ]
rows=rows/count;! N$ n& p* x# H6 F
* _' ^* A' ?% U: E. x, U, y3 v }else{
/ L4 [5 s$ k: O6 K6 p& G S rows=rows/count+1;
' Q7 e9 i6 P3 M6 \- \2 p3 `" T }
3 j& u" `8 a; q. B }9 |& x. e @3 r% Q' G
} catch (SQLException e) { R* J3 ^- { h2 w
System.out.println("查询总页数方法异常"); t2 X1 P! x$ L {: f
e.printStackTrace();- s$ `+ r; w2 n# B+ C1 s
}
8 E( S- Z( w% L, W7 ^ return rows;2 s$ S+ ?) L" }
}
' D# g" q. [9 P1 Z2 e: \/ ] /**: `6 W1 R$ V* v# ^% H0 x
* 根据id删除信息8 H& }) ?5 f0 E; R1 P
* @param id$ A/ D6 E' }/ _$ ^. ^, h5 U
* @return
; G$ O3 K T+ Y2 A& w, M */+ h+ C1 N: _3 Q- ?) _
public int deleteNewsId(int id){
+ ?6 s& Z6 \4 |$ G) |) y- ` String sql="delete news where id="+id;
- @* b! w2 g2 M return update(sql,null);
9 R' [# |0 J' o4 R" ^0 S7 d }
3 ]' o0 J5 @8 [* Z8 z- {+ ^ /**
9 J3 N" L9 L4 {, @( V. a * 根据总页数分页1 T# k% S4 v8 M/ P/ h: i
* @param page
~; n* e& p7 }7 L * @return4 v) |) j" p9 f4 P$ Z9 R% v5 n
*/# z$ Y1 a4 R! L/ `- X7 p0 Q8 W
public List getPageList(int page){
% \0 ?8 H+ ^7 Y4 { Connection con=null;8 M# ~" X4 k- d1 k
PreparedStatement past=null; P0 | m) x s2 w) B
ResultSet rs=null;
( |4 Z2 \8 g) b/ t, |: T6 \, G List list=new ArrayList();
) @; I. C1 P! U; A) O9 I con=getConnection();. B" |8 t2 ^- M& y
//% {5 o' g I. O2 f4 X/ D! u: z
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";) T% ~1 p; Q! U. P$ F, N$ x' }' P
try {
% \ u( S0 I2 m4 p$ i" w past=con.prepareStatement(sql);
4 G; @& u1 b0 t* c w& b8 |6 F rs=past.executeQuery();
% A; l2 W1 U$ ~+ T2 O, S9 k: N while(rs.next()){/ h9 T) u* X8 Z
6 e7 ^1 J/ R: V5 k, D1 H, k* z // id, title, content, pubtime, author
. a- ~2 {7 a- Z2 Y1 _: Q/ u int id=rs.getInt("id");( a! C4 Z, i$ q6 Y- u1 G) x
String title=rs.getString("title");
/ V0 I! o; d/ d! n/ h) v# }, d String content=rs.getString("content");: B+ o' A' S, W$ \$ d* M8 F9 g0 ~
String pubtime=rs.getString("pubtime");
I" t+ |2 N* P String author=rs.getString("author");
+ [' Y! ^9 ?( M2 W6 h) r- p5 M News news=new News(id, title,content,pubtime,author);; J8 U! t6 F' n! s7 r! _
list.add(news);
2 J- Z1 v& s0 F }* k" R; t( n& V6 n; ^/ l) i# {8 {" ]
} catch (SQLException e) {- [% F% V/ i3 i+ `7 D& O* N+ _" A8 d' O
// TODO Auto-generated catch block" R- z2 O) v# q1 k8 @4 `5 Z4 e
e.printStackTrace();) j0 U+ O- ]4 z4 k3 P3 `# u: [
}% y1 s7 |/ B& ]5 S) T. c
return list;5 o& V: B; v' C" D; ^8 X( J. [' y
. k1 p3 D f( @
}7 X$ o+ W" [8 B! I1 |, [% J, ^$ q
}# _. Q( S# n) d) O
复制代码
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