TA的每日心情 衰 2021-2-2 11:21
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package s2.jsp.zhangxiao.dao;
: O. O, c2 x! E( I7 e: E /**" P' T+ [* I$ y; w
* 实体类- k9 b$ \* J) Y8 c/ P- E
* @author Administrator2 b- D1 F7 K, I/ K
*$ j( g* X% g: {6 W
*/
- `% C& f7 P W- q, o public class News {. ^: r7 T) ]1 c& u# s5 g
// id, title, content, pubtime, author' e: y( Z4 A' K; |; j% x
private int id;
) P; U7 b# {0 D8 Z private String title;
1 j1 `' s/ P. @. E0 \' [ private String content;
5 X& e8 f' ]" G' C private String pubtime;
' _& A* @" C3 J8 E. R* f# F% u0 U private String author;( k& t* m( {0 g$ H( J$ p
/**+ e# u7 V) W( K9 R7 c7 O
* 构造函数6 ^1 w" r% H9 C$ R2 n1 U3 {; Z
* @param author 作者
2 s/ K2 ]( {+ b, e * @param content 内容# q) z* T5 O5 D* ]) @
* @param id 序号
5 v9 A5 B7 K/ v7 H Z * @param pubtime 发布时间
: q# N" X% F: L8 t7 I1 z * @param title 标题
2 B0 H2 t5 }2 y% r) @6 @ */5 e/ z2 \1 K! P4 E* L; a1 r
public News( int id,String title,String content, String pubtime,String author) {8 s! h# v3 e# X5 G& d
' @; E8 ], ]3 j) c7 A7 f$ ]- f this.author = author;) J! B0 O2 [8 N# D4 Y# [8 D
this.content = content;
: `, D( E& _% w+ B this.id = id;3 p' Y0 t& C) J$ @
this.pubtime = pubtime;; j( C0 j. e* X8 b7 _
this.title = title;
& G: h% @8 u* J+ v& T- m: n }1 E A8 z- t2 K' q. D$ A* [: @
/**, h5 h9 n- G8 s
* 无参构造函数: D6 k9 N: A- D& L, ]! n& \
*/- Q+ j* r! q( V$ X
public News() {
! ?7 a* Y* R' ~# u! {8 k7 _1 A9 ]* k super();
, A( b; {0 T+ `1 m, O4 H# R }8 v3 y+ H; c; x2 {
/**0 f- n% i; d0 V4 V1 m5 ~: ~4 r
* get ,set : ]; ^) N7 i- D+ ?' Y
* @return; N+ L, A: w1 o; ]+ x" w, F
*/7 Z( ^6 i$ D! U8 O3 H
public int getId() {7 r& m: g7 O6 s; h& e! V! ~
return id;) v$ B+ @1 M5 ]8 [0 [5 l
}9 j) G% a/ d* x
public void setId(int id) {
4 r6 a, w1 R" j! ~8 D) n/ ?; C; g5 q this.id = id;6 A7 \3 K$ S2 a, B& p! x/ x. U' P3 Q
}
$ W/ g7 E; M& a* [; p! T+ l9 i public String getTitle() {# S9 A% x$ l" t6 n* ]: T
return title;$ \! R/ K @; ]" c. ^ F% d7 x% K0 Q
}2 ]- G: L( n4 J' ]
public void setTitle(String title) {% z1 j$ | Z+ Z5 j
this.title = title;
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public String getContent() {
' W' | ~! r3 J4 B( ~ return content;3 _( n* x& C' K2 q- {7 O% Y
}: X) G- G2 c; R- M" `' P
public void setContent(String content) {
0 U, s5 {% N) ]! O this.content = content;7 U# N9 l$ b* H9 n0 |1 {
}
. |) s: I) S* O/ I1 C( C' V public String getPubtime() {
, M' N0 [* V" F x- [5 R return pubtime;
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public void setPubtime(String pubtime) {0 \" {5 J) B7 |; b
this.pubtime = pubtime;
7 L( ~7 T+ d" m" H p1 F3 m }
: V1 A# Z; y+ [9 R% |. W public String getAuthor() {% c/ b" A* P% K
return author;) |) E/ |9 n( c/ e* U1 E
}
2 s5 K9 f6 o/ R9 g* t public void setAuthor(String author) {2 B# @6 q: W5 p; u% j* ^) z* Q! X& u4 D
this.author = author;: F" ]2 b- J# N" F& I" g# P0 r" K
}
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}% l7 O4 }9 V6 Q9 ~7 Y8 m, L
复制代码 package s2.jsp.zhangxiao.entity;
& r& [5 ~$ H' `$ U! ^ import java .sql.PreparedStatement;
3 }: E* B5 S) o% C import java.sql.DriverManager;
- {, M+ J8 d- w4 y# g import java.sql.Connection;! ?! S- x0 C2 l; Y) |& A
import java.sql.ResultSet;
/ h1 [; n3 J8 ^4 j6 A2 z9 L import java.sql.SQLException;
) }1 Q: L) O3 ^1 `( N5 N4 y
* c6 ]+ a! R3 e import com.microsoft.sqlserver.jdbc.SQLServerDriver;
+ }& _2 V8 I, }6 h0 w0 {: l' N: w
* d0 ]/ F' e0 ~9 K. z' o public class NewsBase {9 ?% V+ M7 U9 Y* c2 u* h* t" d
5 c( O: o! s& m# l
private static final String DRIVER="com.microsoft.sqlserver.jdbc.SQLServerDriver";7 E; ^! ?3 _9 [: y4 ^+ d# e5 h
private static final String URL="jdbc:sqlserver://localhost:1433;DataBaseName=news";
7 A# G: e2 X3 v$ J( q private static final String DBNAME="sa";
7 h( m: O) @$ t8 V. x: O9 f p private static final String DBPASS="1234";
6 }/ w( C4 P9 f( K
# ]8 ?. m4 j# r* S5 Z public Connection getConnection(){
G. P. m- U6 P/ r' K Connection con=null;
- b7 Z+ T" Y6 x try {
( t* M- u5 C0 R3 P, f( b Class.forName(DRIVER);* v1 |" h" s- c4 |% E; ~
con=DriverManager.getConnection(URL, DBNAME, DBPASS);4 i8 l: q: E i
} catch (ClassNotFoundException e) {
5 l3 |& g: T; i6 P1 p System.out.println("加载驱动异常");
( i3 K- k* E: | e.printStackTrace();
& U( ~+ X" b6 K } catch (SQLException e) {
- d0 o/ m+ _! k' L' k$ J System.out.println("数据库连接异常");
0 ~4 \2 |- L" T( g8 c* O, [ e.printStackTrace();' N/ b# F* {+ z( R% e
}
( `7 T h( Q- i6 S return con;& _. P' y$ l% C1 z; P b: o0 @' S
}% \0 D3 y6 \1 x: a. q0 r4 g5 B" w( h
- C7 ^4 _/ T2 A7 a0 ]& H public void colseAll(Connection con,PreparedStatement past,ResultSet rs){
% T2 O2 n/ i) g8 X" S: H# C try {
2 G8 F( ?: M5 E% \8 w9 \ rs.close();* p7 x2 T# R! W
} catch (SQLException e) {
+ p+ f5 T: X+ T System.out.println("");
" v i" G7 x2 _3 l2 z e.printStackTrace();
5 c3 Z* o2 Z7 D( P8 | }
! Z: E4 D5 n% b. c4 e$ `% L try {
2 |) l* L) ~) b/ {! ]! X past.close();+ k" n6 I, n v; F2 i5 T9 t
} catch (SQLException e) {
1 u2 X1 Y) R* ]! R' R9 g: h System.out.println("");
& i% j- V# [7 s, K0 {7 ] f& W$ O e.printStackTrace();4 J$ y- \6 w& x, g$ m% B
}7 {& X" ]* U5 ^7 C" v
try {$ j6 D) X- n D3 e" R
con.close();; i( K& q x9 K. ]: E$ s
} catch (SQLException e) {+ n, ~$ v! ]0 L( P. H9 D
// TODO Auto-generated catch block: W2 D- W4 B3 g- x7 B2 U1 y0 Q
e.printStackTrace();
' ^8 q' F5 B6 }: H6 e' ` }
5 ^$ Q: [" q. e7 F/ w. q$ e }
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; H$ W5 ^- f" L' G& Q0 w public int update(String sql,String[] getValues){+ L1 r2 ?9 J) E' R
int i=0;
' b3 G! I2 J/ @5 \6 t" L4 d3 Y Connection con=null;# N o! r: f+ p1 U W+ b- f9 _
PreparedStatement past=null; x" \' O/ t3 G% I# M$ m. k# Q# b* |
con=getConnection();
5 j5 b r6 o, m: W try {
0 C3 e0 |) w6 C* R3 \' D. N0 ? past=con.prepareStatement(sql);4 m6 x0 z2 m1 e2 ]# M8 J9 Q
if(getValues!=null){
4 N0 |, [! O# T& y! t9 @ for (int j = 0; j < getValues.length; j++) {) q4 q* B( x3 c4 [4 H
past.setString(j+1, getValues[j]);
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}
( P1 g% q) |/ r o1 P0 i9 x) A1 ^% T i=past.executeUpdate();
7 a. r! r. j8 v6 u3 Q# `/ c0 e } catch (SQLException e) {
7 n0 X6 k; \. X/ z4 l // TODO Auto-generated catch block
4 T* M3 Y) _1 x+ u e.printStackTrace();
+ u, W- Y4 c* G' D3 c }
! l8 m. q h* V/ P return i;
7 v' {* m/ Q9 X( q3 C" ~0 I" r }% D Z5 d; M, s
}
1 p! R/ h5 s# |5 V- p& J, j3 ~3 o 复制代码 package s2.jsp.zhangxiao.entity;
8 k Q6 ^$ f7 V# Z9 o \" m7 e4 o
; E% y0 y: w7 `+ y( ~# A import java.sql.Connection;: z2 \8 E/ Y( d9 x
import java.sql.PreparedStatement;/ l4 R$ D5 q' w$ E( c1 w
import java.sql.ResultSet;
& R: _3 D+ l; M4 t$ ^" D( a import java.sql.SQLException;7 L P3 Z0 N6 R! [
import java.util.ArrayList;$ V- G r, x( @, F$ C5 [
import java.util.List;
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import s2.jsp.zhangxiao.dao.News;
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public class NewsDao extends NewsBase {
- U+ e, v! C/ e private int count =2;
* v2 o# C" w: ?" N' q
C+ F0 s$ v) m- U$ q% U /**
# s4 V2 F* k) Z: N * 查询总页数" a7 W% w4 W0 f% c
* @return; G4 m% V$ ^- e2 d( r N7 n
*/
! c) n- o$ u: A7 ~. G. U% S public int countPage(){
. S) ~7 d3 ]2 Q int rows=0;
# K! _1 X8 [/ H7 S* K. l8 p7 P Connection con=null;& y6 N: T7 \4 m3 f: @
PreparedStatement past=null;
% @, w3 G" V7 Q% g( E! o# l3 Z ResultSet rs=null;* [3 c4 z& V4 ]' G/ V; o' [$ j8 {
con=getConnection();
8 c( W. z ]8 B. g //查询所有的的页数 返回受影响的行数0 c, O2 a4 N- Y2 S3 }8 w7 i
String sql="select count(*)as c from news";. k+ y7 x1 o3 i0 N, V6 s3 D7 `$ y8 E
try {
! E- e6 D A0 `+ `0 ~4 y/ r w5 E! j5 { past=con.prepareStatement(sql);
9 p' o2 H, w5 d/ Y* j rs=past.executeQuery();
. h: x: F. j2 p+ e if(rs.next()){
/ l' a# M0 X8 H( G- f* G //将所有的行数保存到rows 变量里4 s* R3 v i9 j1 [& P
rows=rs.getInt("c");
7 {% D$ h c' I# n3 ~. |$ | //如果显示两页 count 代表显示的页数 @- G4 ^1 j' I% ]' _
if(rows%2==0){
, `5 ]6 D4 Z8 a9 L rows=rows/count;
3 [ H% D, a" G9 `, R% S ! f2 Z! R3 e# u7 j- }
}else{
/ G+ \" C0 k/ d. p rows=rows/count+1;
" [ A' |6 K# v2 G& I }% W4 L6 v. \8 Z- x! D' q, I9 p$ M5 c
}1 e/ z* M% ^3 x- U
} catch (SQLException e) {6 t* [- e- n0 r9 h
System.out.println("查询总页数方法异常");, B5 h- P& L, }3 Y8 i
e.printStackTrace();5 c3 O1 ]% v) F1 W' \" G- C6 h
}
% P ^' T1 i" i9 ], z. t: S. n return rows;3 A) k) j! I0 t7 d7 d
}, z; D4 Q* D: y5 [7 G1 N
/**
' ~- c" r+ G8 j$ R& j# S G9 z * 根据id删除信息
; I1 l2 s7 A1 X6 z * @param id
) V) s+ `0 p* T; O9 F( U: _ * @return3 Z7 f. Y8 G: b2 F
*/
- ^$ M; p: Z0 K4 e* {( g, u public int deleteNewsId(int id){4 d# F4 g5 H' F1 c3 @! w
String sql="delete news where id="+id; E& N5 n; U% i% _& D
return update(sql,null);
# ?) [ m" q( m6 X3 d }) i; ?' r2 f9 t" ~1 S- K8 p
/**
; o$ ^# Q/ k) x7 y0 p * 根据总页数分页* H8 L' w, A- _5 }4 o
* @param page
+ y. Y5 C. t, C * @return' o5 N& G0 ^2 q$ J, z0 ]
*/
: q# V; n+ X4 D% a; Z% s- q public List getPageList(int page){. d# b& x- Z4 t2 P+ r
Connection con=null;
+ u" t; X c) G( Q/ Q$ s PreparedStatement past=null; k D7 a$ Y& U' o3 }3 S3 n4 V
ResultSet rs=null;
% H7 o- d: e7 ?$ o+ }+ X# y1 ^ List list=new ArrayList();
1 d- J( m2 `. Y9 G6 e; T4 @0 L7 u, u% i con=getConnection();+ v0 ?% [9 x# ` k- K8 v
//
8 k7 N5 u$ z" r7 ?, I8 H 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";
( G, |) Q9 `+ P- w try {
& W8 h! m3 X# a7 d+ w2 r past=con.prepareStatement(sql);
; V8 A5 q' ]- I% O( ~ rs=past.executeQuery();
: ~: v( ~: N7 p2 d4 y$ y while(rs.next()){, r: e: M. R. c* F+ Q
& q( h; P' ^2 X5 x; E; n // id, title, content, pubtime, author
7 Y9 ?; |8 C( ?! ^# f: P int id=rs.getInt("id");
7 _1 U' A ^" b$ g% L- ^' s String title=rs.getString("title");
0 z: g( `+ C2 V" P X) g String content=rs.getString("content");
+ F! l* ?$ z& x* y" [$ v String pubtime=rs.getString("pubtime");) }+ y( {- z. r9 r7 v% L; V
String author=rs.getString("author");
; N( l) N( k: z- G- m5 ?- l News news=new News(id, title,content,pubtime,author);1 P2 y5 p3 \" W1 W0 r! d, l
list.add(news);* v: }9 S5 ~3 B1 z* c5 A* J
}
0 w0 L [8 V) O } catch (SQLException e) {
+ N/ v! N/ q7 ]- _5 Q" H& [( Z; \. N // TODO Auto-generated catch block
( ~* G; A7 T0 X( S e.printStackTrace();
4 D+ n$ l) V5 e }/ [" l) e( g' Z' l7 J, k5 P# ~% [0 N
return list;
( _3 x4 k( p& W2 f5 G I
3 d5 ]: ?6 P7 }0 l* V8 M3 ^ }+ `) i* j! p2 I
}
& i. m6 |9 X! c 复制代码
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源代码以及数据库下载 :
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