TA的每日心情 衰 2021-2-2 11:21
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package s2.jsp.zhangxiao.dao;
7 V2 D4 ~% l: ?8 [ /**
1 c2 j3 Z J" r0 _6 E+ U3 c * 实体类6 X9 |/ R9 m( _
* @author Administrator4 w% n4 \* q5 m/ ~4 d
*
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public class News {3 F: W, p9 q3 v7 p
// id, title, content, pubtime, author
, M2 b K# p4 _% K1 `! W B S" G private int id;( U c1 J3 [1 _7 {1 G3 \ J- [
private String title;
, u" N5 V6 @9 W5 a private String content;6 M( b1 W( S3 z3 L8 x7 Q: y; d
private String pubtime;
* O# R8 k3 |* z private String author;
* n3 C2 {0 u* B; J /**
3 \2 L% A( }2 |7 g' Z * 构造函数
: W) x: q5 @$ y; E# m * @param author 作者1 ^( n7 S$ C# Z8 J m1 T
* @param content 内容' O, _5 I$ n1 B; d/ }8 w# x
* @param id 序号+ y1 T/ J+ L6 w
* @param pubtime 发布时间
C. B" ~0 e* S7 Q' d * @param title 标题% F+ y7 b' j' X' C% d
*/
: r" ~$ S0 n( o+ C+ [ public News( int id,String title,String content, String pubtime,String author) {
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this.author = author;
+ ^7 I% S" Q0 q) S. y this.content = content;# C- j2 L/ A m0 Z
this.id = id;
% y& C; o* X- S this.pubtime = pubtime;8 l% Z6 u8 ?0 A$ m1 f
this.title = title;: d5 j; v. ^+ l m
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/**
7 D$ w8 J4 R! r7 r$ | * 无参构造函数: {% m- p( |5 e# @- ~* B
*/
% w+ L" C1 X/ J% ^ public News() {+ X3 b( P. ^% f6 a
super();
7 [" i4 D- [0 e" u- q }2 a5 I* _* h# W1 U( P( p. Q
/**
* j; p& C3 {- F * get ,set
/ y, \. A1 o3 m$ d. p * @return
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public int getId() {
' N, `+ ~0 j* w8 I J return id;8 d& e9 D9 a4 T2 x; R: J9 o1 T6 r
}
2 w) @ Q/ \2 v public void setId(int id) {$ J0 C: ^8 S* @& R/ `- }
this.id = id;% t) p1 v6 M+ P; @- \
}% i# L2 J {+ K2 D8 r8 q# M
public String getTitle() {. { c O$ |4 F4 c8 a. x
return title;
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# [% Z8 X# f1 \; P7 j public void setTitle(String title) {- ]6 ^6 x- I! [. F5 X5 Y1 L
this.title = title;) ]' \8 U9 I( V2 ?, k9 d: _) t# m
}
- A2 V; i z" ~ [ public String getContent() {
; H; l+ x- t" q; X' ^ return content;9 O) @6 u5 g$ c/ R8 j( T: S7 S
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public void setContent(String content) {
$ N- M, u- \) D! @" X this.content = content;
' _6 g! ^0 {( S6 f8 f1 v0 _ }6 `* Q1 d8 v" [- h( D& X# r5 U" y
public String getPubtime() {4 o7 z* A p9 p8 T
return pubtime;$ S. ?) ?5 e2 E
}
$ E _' j8 @# T" ?' G public void setPubtime(String pubtime) {( F. X7 i5 F+ @0 Q
this.pubtime = pubtime;# z' E* ?0 d @. M- @
}
" S4 V- @3 B5 `" R6 w; D4 m public String getAuthor() {; }* M& I5 Y( k6 x, y1 z0 ^
return author;
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public void setAuthor(String author) {
: L9 ^) N) g, q8 Y5 S1 L this.author = author;
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% b( [' [; d8 K# ]0 C: n }
# k4 A1 Z: ?' \- a7 W/ M# | 复制代码 package s2.jsp.zhangxiao.entity;
+ w3 Z. J4 f* e m1 v6 [ import java .sql.PreparedStatement;8 J6 N3 V7 } g' m& Q5 V1 \
import java.sql.DriverManager;* C) E! T" c- D7 B- M1 L0 k
import java.sql.Connection;) I! Z9 s" ]( r- ?9 W) Y
import java.sql.ResultSet;& N- p6 ]6 X0 K% r) G8 A
import java.sql.SQLException;$ g' |$ Q9 F/ p- Q9 b. V) U& U" c
: I1 `' ~; q; K" W. J# p2 K1 d& H import com.microsoft.sqlserver.jdbc.SQLServerDriver;' ^6 `0 v7 a/ b
7 b* Q- S/ m9 E5 A, T" x) w
public class NewsBase {$ X' s. M0 G, p1 J7 [- C) n
/ u7 Z) B% j$ A% @: b; Y& b
private static final String DRIVER="com.microsoft.sqlserver.jdbc.SQLServerDriver";4 @# H! O: ^8 `. g- a/ O1 h, u$ N
private static final String URL="jdbc:sqlserver://localhost:1433;DataBaseName=news";
- J+ ~% Z) m2 ]; @, X private static final String DBNAME="sa";* S. g ?% d9 ?% K
private static final String DBPASS="1234";" V0 i7 E) o# w; o D: b" n$ C
( a7 p( ?; p. I4 l" v5 n public Connection getConnection(){9 a3 |0 Y0 B' `* y9 S6 T
Connection con=null;2 M' P8 w" ~# Y
try {6 I9 f. Z# a8 z7 ?3 x
Class.forName(DRIVER);
: m$ [% ]6 ?8 W- y' i con=DriverManager.getConnection(URL, DBNAME, DBPASS);3 P9 f1 j' J3 R9 j
} catch (ClassNotFoundException e) {
# w V% P$ @, V( ~5 S1 {3 I System.out.println("加载驱动异常");/ ] Q* N" e8 k
e.printStackTrace();. _* r" e. e1 t/ h; l! C, ]" }) k
} catch (SQLException e) { H+ m: ]1 l/ Y7 t& d" i
System.out.println("数据库连接异常");' c; h( q: D2 h3 ?( @
e.printStackTrace();* |( u: B( `+ `( q6 g
}
4 P7 @) G/ x4 L return con;! L9 m. ^7 G$ M: ?9 ^
}
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public void colseAll(Connection con,PreparedStatement past,ResultSet rs){
! p) B1 u* ^1 C9 s5 H9 |# P/ Y try {
* O5 `$ [& |6 Y7 ^) V: b rs.close();7 ~* S0 `- A, S1 f5 t4 N( }0 [
} catch (SQLException e) {' ~, h( M' k0 E' \& x) e5 b4 h. w; K
System.out.println("");8 s: f) v. q* L
e.printStackTrace();
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try {! K I2 P2 T6 f2 v$ r
past.close();
; D5 a' [1 |7 y } catch (SQLException e) {" V$ F) q! |( L# [$ \. g+ J! J
System.out.println("");
& K; `' L3 K& ]/ X$ r2 { e.printStackTrace();
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try {
s P5 A2 S6 | u$ ?( { con.close();
9 q" {! \, G' c; Z1 z } catch (SQLException e) {! T6 _! Y2 f3 q# ` w/ A3 I* ~
// TODO Auto-generated catch block0 V6 @8 S% X+ Q. a. Q* @/ @* B: H1 L
e.printStackTrace();
5 @9 D- }" \5 T }
, i+ U$ c6 c" G }
; B2 {/ T* h1 s: {
2 w M1 ^, f1 s public int update(String sql,String[] getValues){
8 F. p2 u, E' Z9 u% R int i=0;
. q/ A9 W: Z% S Connection con=null;
( W" y* r1 W0 m8 j( K PreparedStatement past=null;0 u) ~5 u. f1 a$ @ a8 D) `
con=getConnection();( W& M! N# ^) {: L# L) x) _( j( c0 g
try {2 z9 O4 O' n) o0 C
past=con.prepareStatement(sql);
- h n4 D& f9 ~2 T if(getValues!=null){
$ q0 p1 G; C: A, y6 H; Q$ @ for (int j = 0; j < getValues.length; j++) {( w0 P S4 S9 ^ E
past.setString(j+1, getValues[j]);3 A! Y% s: P7 I
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}
( C! j5 U% R! s. n- W i=past.executeUpdate();7 m% s! W) w, w/ d3 x' L
} catch (SQLException e) {
2 n$ C+ W8 Z. B, p // TODO Auto-generated catch block
* v n" U J8 s e.printStackTrace();
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return i;( U, w i9 ~7 a
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复制代码 package s2.jsp.zhangxiao.entity;8 A; E& l0 M$ d, s
* Y, q/ e* g1 S% d& F2 P' _ import java.sql.Connection;
+ h" \2 [' ]5 ` l8 T7 ^. J+ ]1 c/ k import java.sql.PreparedStatement;
+ R! h8 G, v5 h" _/ z G import java.sql.ResultSet;& p& ?$ \( _0 L5 \$ c3 a, t3 {
import java.sql.SQLException;
$ l0 D4 L0 X! w% Z; j5 @' g import java.util.ArrayList;
3 \+ W/ f3 o, p import java.util.List;
$ V8 M* E; l+ f# i' M
/ {, k! i) |) C7 b3 A3 Y9 m import s2.jsp.zhangxiao.dao.News;
~3 r& W% ]0 I9 v: q4 Q# Y
6 x9 ]* V3 w+ {0 u public class NewsDao extends NewsBase {
1 t4 W& Y; G% _) G' M7 G5 e private int count =2;
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/**$ V, g6 y4 [. E1 v: a0 I
* 查询总页数
4 @1 e. ~# s' y x. U * @return# y1 L+ H& v, G8 ?: w1 ]1 t
*/
# P3 {$ n7 t* T- Y public int countPage(){8 J1 }. r* {9 K) y9 v0 e
int rows=0;
% I$ D9 o7 w. R% @0 f Connection con=null;
7 }' N; ]; m7 v" m0 w PreparedStatement past=null;1 {1 a8 P( O; p. e8 Z
ResultSet rs=null;
5 A8 x# Q' G. }! s& z% d0 t1 Z( o' n con=getConnection();
+ ]3 u7 H. C; e" e //查询所有的的页数 返回受影响的行数6 W5 R, k: j% X( @% u4 D
String sql="select count(*)as c from news";$ ]% v. {2 W* J6 Q& j
try {7 r( f. k( Q; q+ I/ a) H- f
past=con.prepareStatement(sql);. ?; H+ @2 a2 K$ P
rs=past.executeQuery();
; B* i4 U0 X: E0 @( N if(rs.next()){
0 x& K- i f0 P5 `( [/ n //将所有的行数保存到rows 变量里
' Q, z+ C: ]5 @3 O& s+ ` rows=rs.getInt("c");2 E+ M% y3 D( c( j+ i4 p
//如果显示两页 count 代表显示的页数 $ K# t6 h& ~3 h* {0 X
if(rows%2==0){
3 @5 `' M( e1 h9 d, n) o rows=rows/count;0 B, `! E1 l5 E9 l) j) q Y" ? H$ Y; l
: X) D$ `( A: M6 b: I8 g
}else{
) T4 S! p- _) q/ R* Q rows=rows/count+1;9 ?7 X- H _. B- G4 T8 s* g- w
}3 V7 c0 G1 O4 \; A4 W
}
& y! Z3 ^6 N; j* J3 f4 C- y } catch (SQLException e) {
3 B/ p& m; x; V. L; H, N f2 h! Y: C0 l System.out.println("查询总页数方法异常");5 B9 l* V/ c" \: u
e.printStackTrace();
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return rows;
: [ F0 w% B7 t6 A }
+ l4 n7 K# B. V* k3 g( S /**
7 ]. g4 L8 y/ n! f+ } * 根据id删除信息, w% h' i2 X- J, G Q! Q) U
* @param id6 i4 s. X1 }: ^. Y
* @return
! `7 Q( Y! V, a6 P9 Y$ D& J3 b */
# B% m: W# n! z6 W" R public int deleteNewsId(int id){2 @2 ~9 g+ c: H- Q# e8 U m
String sql="delete news where id="+id;
5 `/ b. g8 [# H5 @7 j' F return update(sql,null);
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/**
, ` ?2 `8 S5 E$ W& D9 c * 根据总页数分页
9 H! f8 A. r6 T7 R0 p, d5 G * @param page9 C* g @+ M! A! l
* @return
- H( X. ]0 w8 b/ e( E: E */
5 o5 V* }0 @4 {* G* I public List getPageList(int page){
& `% B" N: F0 y1 I/ M p Connection con=null;4 R) m- c. d. ^
PreparedStatement past=null;
9 @% [8 u4 s9 B0 [( l; S4 D ResultSet rs=null;# Z# ^2 N# f. u6 N, E
List list=new ArrayList();
' x# e; u, `0 |, U# s con=getConnection();
2 E6 Q( R$ Z& A //
+ r: c( G8 O7 U5 A 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";
6 ~) J" R4 l% r9 A9 j, z try { ]& k6 O {5 g' P( c; H) i, z; j
past=con.prepareStatement(sql);- z" k- p- P: N; p/ w1 t W; M
rs=past.executeQuery();
) J( c3 |/ Q! I9 L. d while(rs.next()){/ \+ s7 |$ t2 S) \
7 N0 h( R) m# C& F( W, g, O% ` // id, title, content, pubtime, author
* n% e. t" u& J8 M5 K' ? int id=rs.getInt("id");- r; v" @) t4 y- y( S3 `4 w
String title=rs.getString("title");
. W! {, k' N, f+ T String content=rs.getString("content");
; Y: ]0 m* N. N) ^, `# S String pubtime=rs.getString("pubtime");6 g$ J& f1 G0 ~' i$ m
String author=rs.getString("author");
4 j" @& H5 E- N3 c, H! h6 _0 L6 B News news=new News(id, title,content,pubtime,author);: s, ]) b$ R$ o7 \8 _
list.add(news);
* i0 S7 z. n8 W2 g- ^ }8 |/ V" d! P& _7 D
} catch (SQLException e) {
- ~' [" c4 C! G8 U // TODO Auto-generated catch block
m0 q+ s9 s5 n! z. y e.printStackTrace();. i7 q" W9 j( t5 V% e
}' d/ P& [2 V" g) M) }- M7 Q5 L+ U
return list;5 C+ I7 Q% t0 \
# \' @9 n# C3 E) T
}6 ~ K# u! r# C( W
}
7 l& e$ R' A7 S3 f$ y- b 复制代码
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源代码以及数据库下载 : ; N4 k0 w J! G
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