TA的每日心情 衰 2021-2-2 11:21
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package s2.jsp.zhangxiao.dao;+ j3 t3 `! G) S4 O5 c
/**& b2 v8 H. H" ?' r; y
* 实体类$ ]2 L6 J3 p( E( u7 U
* @author Administrator
$ s; ~ Y3 J& V$ E/ W *
, z+ p! b* L4 c6 g( |! J */
9 y D" }4 e( |* w% K public class News {
9 n5 o& j9 n+ j' M$ D // id, title, content, pubtime, author( T: m1 `1 i3 Q( Q- ]
private int id;
: U" S! j. U+ D5 D0 y/ q private String title;" I% Y; l3 F9 S, S$ q2 J6 r
private String content;
6 N% F4 e# Y/ `2 H0 |/ e private String pubtime;
, P8 ^6 o y, G( [ private String author;
5 h$ r, q9 b9 d" m /**4 v4 a4 x5 X1 N5 z @
* 构造函数
- g8 w" ?3 B; k' w2 c/ s$ g/ V. s2 n * @param author 作者4 y* |: H& D* ]1 m% m+ D3 R# W& ~
* @param content 内容- H) Z3 n5 ^1 s/ g8 y5 V
* @param id 序号& O: H( @; m+ a& U; N2 m9 p
* @param pubtime 发布时间
) a2 h& x7 k5 F4 s$ [' C$ a! E * @param title 标题/ Z/ G1 W5 N0 J J& \& E
*/
- t: S2 r$ c0 g0 G4 x public News( int id,String title,String content, String pubtime,String author) {
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this.author = author;# F! L( \/ }. Q3 H G
this.content = content;
7 s. N5 d: y) u this.id = id; u& W2 ^4 Z* f$ E/ r% m9 a
this.pubtime = pubtime;
% @3 M& J8 l$ A6 A$ x+ G7 L this.title = title;
% V+ B6 C; a t, l$ U' r }, f* A+ T& p; i0 `" w
/**
% ]) G# ^* u5 S5 a6 g; ] * 无参构造函数
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public News() {& M) ]* |! ?' r) k7 E6 N
super();; J5 v7 l* G2 }3 j% E8 |
}
. ]2 t) Y7 d: P1 R /**
* ]: a* h7 O8 E; j* [ * get ,set
7 F/ q" z5 @& S0 M+ D% G% B" @ * @return
# w B$ u3 V3 J. B */8 U$ ^! W* O0 o& ?4 ?; h- q
public int getId() {
. V; y: I! O$ ^. V0 [5 i9 E return id;) E c" t% e# ?1 _8 W
}" |$ K C8 A2 Y$ y" B9 c! `
public void setId(int id) {
8 [6 t2 w5 W1 g7 G6 z; l# I this.id = id;1 z" t: Z1 n# ^; H& a' F, R+ e M
}
" g( `( l6 [9 ~$ r: |$ ^6 [) z public String getTitle() {7 o4 K* r% Z' x* }! G
return title;+ s( l- R5 L. J1 M8 s
} A8 n3 S/ R( L# G8 e$ ^+ F1 z4 p" l
public void setTitle(String title) {- Q& M! i" Y8 B
this.title = title;2 O) _% V( {; p1 P- \4 `
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public String getContent() {- \# q( t* J$ [$ ?# D O& d3 Z/ q
return content;, W3 u$ O4 |1 D5 t) `! o( A+ U* X
}
$ a; ~+ }1 M, B& N public void setContent(String content) {
* B- v' x2 p# \& I this.content = content;$ b) y1 t" d# z/ W8 n
}, j4 p4 A# }" i3 J7 H2 j
public String getPubtime() {) E! K2 t* H& g9 h, z+ d' I' Z
return pubtime;
# Q) P" ~) q# o }& P4 e* e/ a' m: i8 N. Q/ C6 L
public void setPubtime(String pubtime) {8 z. X" f @! j0 d/ J! N
this.pubtime = pubtime;
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public String getAuthor() {3 V+ [0 W/ l& [; E0 P# h/ [) V
return author;
P9 e' A+ D* t5 ^9 r2 z }
! q: I' b; B2 M9 d public void setAuthor(String author) {
2 C, o6 U) J" F- q& d) S this.author = author;/ _7 D( s' w4 ?1 |2 u c
}
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}" g8 h& A4 A) \, t6 r0 e
复制代码 package s2.jsp.zhangxiao.entity;$ ]. Y! ~3 N( g; B6 j+ t7 e( \
import java .sql.PreparedStatement;
2 V: C0 b1 Y3 a% E: J2 } import java.sql.DriverManager;! Y' `; k0 m0 _5 G. \& l. }
import java.sql.Connection;9 w5 x& r: ]3 j/ C
import java.sql.ResultSet;
( P, H; G, i3 ~. \' c* S+ m import java.sql.SQLException;4 N; N0 M" N6 n, O
& d- O; N9 V; ^4 v7 H1 q
import com.microsoft.sqlserver.jdbc.SQLServerDriver;
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public class NewsBase {
1 O/ E! h1 F! U9 s6 C
6 D. @& |6 k h. } private static final String DRIVER="com.microsoft.sqlserver.jdbc.SQLServerDriver";; a, g+ @4 L2 o: H S2 \
private static final String URL="jdbc:sqlserver://localhost:1433;DataBaseName=news";
' C1 o' J& Y' M+ l& f0 d private static final String DBNAME="sa";
" [0 }* y/ [$ _ private static final String DBPASS="1234";
' t7 P0 g9 S, [: C) D7 @4 F# i . G8 f* F, N& k
public Connection getConnection(){
2 B6 x- [6 A: n n$ a2 p+ C5 L, E Connection con=null;
/ D, v5 R! M/ C# z3 }* N try {
7 G' p+ I: X9 m0 \4 N# A" [ Class.forName(DRIVER);
[0 w3 j7 q) v con=DriverManager.getConnection(URL, DBNAME, DBPASS);
8 I( k$ T* z& i! s6 @ } catch (ClassNotFoundException e) {$ W: `! s1 E; V, b# l7 p* d
System.out.println("加载驱动异常");
5 b A. A% _$ _ e.printStackTrace();4 r7 l9 Q, v9 @+ t7 l, m. i
} catch (SQLException e) { D4 x4 o- L7 @ M5 ~1 i* k
System.out.println("数据库连接异常");6 [: k7 D( I0 K, M6 Q
e.printStackTrace();' L. o9 j: y0 x% s. ~$ O' R. i7 \: R; w
}
- l9 r; H7 V6 L8 I9 K3 } return con;
9 |- {/ K& i- z! m5 P }
3 l2 g C& I! [0 ]2 |
; Q6 D( V3 m. R' v F0 `) n public void colseAll(Connection con,PreparedStatement past,ResultSet rs){+ u" x# s: N7 g: Y( U9 y
try {7 f3 H9 s, z& A ~7 F" |# M5 f
rs.close();" n( a8 ~7 F2 `8 x( z" W
} catch (SQLException e) {
9 _# }* n) a% K4 C System.out.println("");# }0 _" R, ~9 G5 O& G3 S
e.printStackTrace();
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try {
7 I2 t0 w# p4 a% D past.close();
2 @8 K" m1 j) y# {& p4 |& S: ]! X2 [ } catch (SQLException e) {1 u# t) Q/ B; F; R
System.out.println("");
* I( v" V( ^( d# L) P7 Q' Q e.printStackTrace();$ S: Y, @1 g. W# }9 U4 ~
}$ r+ q' }3 o$ i3 ^# ~
try {
( c/ b# ]; l, t' l/ g$ X$ P con.close();
' s x+ Q) I+ E, y/ G+ R- [ } catch (SQLException e) {' r- G: ?% {, I, W" l
// TODO Auto-generated catch block
; ?# a/ j ]1 l: ?% h& | e.printStackTrace();" N7 o$ b8 h6 G2 L5 a4 b* \" h
}
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public int update(String sql,String[] getValues){
4 o% W) p$ p. i& |, z6 h: b int i=0;
) `; E7 F9 O3 K: h: e3 B8 \ Connection con=null;
3 B A/ j+ i. S) g PreparedStatement past=null;+ Z9 R1 u3 G: v. v3 H, o3 u
con=getConnection();! _- b% x/ \% a5 E ^4 O
try {6 e, {$ v4 @2 t' n. P/ ^5 x6 O' W/ I2 v
past=con.prepareStatement(sql);- {8 S' M3 s+ Y0 n7 U
if(getValues!=null){8 N8 l$ _8 x3 n' A7 r2 G
for (int j = 0; j < getValues.length; j++) {
$ d4 e6 n% H, s$ w! i7 T% m1 A past.setString(j+1, getValues[j]);5 |- [7 \, T9 h. y+ \5 t3 X" f- W3 X
}
" s' l- I G1 _ }0 K+ n& V/ V7 k* m! O: ^
i=past.executeUpdate();
6 {9 B( s; T- v m. D8 T( r } catch (SQLException e) {
# k1 m0 B' n0 G // TODO Auto-generated catch block2 z% f$ \4 F0 Z8 _4 y3 k0 k
e.printStackTrace();& B. e- V; g! t: N% R
}
/ x, A. {% m1 ?; b' u return i;
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9 I# Z, l& U5 V! k ]# ?% c }
' M/ |, o$ Z# ~ 复制代码 package s2.jsp.zhangxiao.entity;9 P, ^8 w8 R1 h8 w
' Y3 i2 k( a6 ~( R) c
import java.sql.Connection;( ^1 R8 |' ^6 C' R2 g) H2 ]
import java.sql.PreparedStatement;9 M4 v6 }! o, N3 L, r0 c( v
import java.sql.ResultSet;/ |# j: E3 L, h9 \+ R
import java.sql.SQLException;# H9 k9 l7 A0 }. t+ b
import java.util.ArrayList;
. x! U1 v6 D& X) s8 g% r6 R import java.util.List;
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7 K; J* W; S+ y# n4 V$ J$ h import s2.jsp.zhangxiao.dao.News;, v" U3 k! w" m
/ [. i% L' p/ ]; z8 \) `
public class NewsDao extends NewsBase {
+ R# c# V j% T9 @6 a- E private int count =2;
% }( K) ^+ M& j" F/ O
$ q# C& u6 K5 l+ \/ A /**
4 s# k" C# Q( H7 @! H3 y0 e * 查询总页数
- p8 N9 b. I. }$ r * @return
& A5 |( N- s1 Z2 `! V */3 x% v; x/ A! F$ ^! ^- l. t* S& T
public int countPage(){+ S" u# \( ?( d8 E8 @% k
int rows=0;
8 B. W, U1 b+ }. v4 h+ _! u! L Connection con=null;1 i, B- Y+ T% \# F# I; v3 |
PreparedStatement past=null;
5 Z9 n4 @& ^4 U ResultSet rs=null;! k9 N0 b, L; A9 S1 @
con=getConnection();9 H0 [. G V9 E
//查询所有的的页数 返回受影响的行数% Y; I0 V& H# C
String sql="select count(*)as c from news";
$ [; U: u$ P+ k7 w try {
2 g5 H( Q( J1 p" A& N* D9 E past=con.prepareStatement(sql);* B* F( s$ \" c
rs=past.executeQuery();6 y3 \* F2 t X
if(rs.next()){" h7 `2 A1 W' v3 D% ~1 V' p
//将所有的行数保存到rows 变量里2 \5 V9 d. s% a5 k& {3 G5 H
rows=rs.getInt("c");/ O8 |, r& A, l& f
//如果显示两页 count 代表显示的页数
1 D/ J0 B9 T2 O8 `8 q if(rows%2==0){
n6 ~2 y+ \6 v- k& M% w1 } rows=rows/count;
* h$ ]" r9 U2 X. i$ o3 f) W1 u ) e; r B" |; z- j1 n
}else{. Q4 a6 q" Q* A7 v
rows=rows/count+1;+ h4 q% n( `" B2 \- N) w8 q
}
/ ^" V" s& R! E6 }# I6 w' c+ d) T }
8 _6 ?7 s9 W) R9 p5 G } catch (SQLException e) {
8 S( H1 n9 x2 Z8 o System.out.println("查询总页数方法异常");
) l1 b( q$ S, R; @6 E; i e.printStackTrace();5 h" T- C: O; X
}& s1 g0 R: m; Z5 m, w( u7 e- q+ ?
return rows;& L/ E/ m: d* L) e8 r g' a) w; r
}8 T! T3 N1 o- F
/**7 i2 Z! w0 h$ S/ S: `; m$ N4 r
* 根据id删除信息
3 B D/ J4 e1 P$ b4 H# [ * @param id
& ]) _1 H& R: K% ~) I( r * @return0 v- e3 F& @& k3 ~9 G
*/
0 F$ I3 Z) y7 |% b public int deleteNewsId(int id){
% D+ m+ N& O6 o c- d! N String sql="delete news where id="+id;% c0 q X X1 y; w
return update(sql,null);
8 r) L. B' B2 J0 s" }3 c% S+ |2 A }
/ \! B6 l- D1 y /**3 @. l3 e) u$ i. Q9 n* q2 B
* 根据总页数分页
. K. T. {2 m/ J; J4 S7 }& j * @param page, E9 @9 v# E: v; H6 w: h% o! `
* @return
2 t* w& l2 y# x. l Y$ u */
3 k0 N" G0 @, a public List getPageList(int page){' {" i" C1 r% B. |$ T6 v; p. w
Connection con=null;: g( Z( }" z# R
PreparedStatement past=null;
- x' t; M# L: p7 n8 B8 g3 k ResultSet rs=null;
1 ?: O7 E9 r1 Y- n& ^& N$ ^ List list=new ArrayList();
& e5 j! q8 ^% f con=getConnection();0 Q7 X8 J0 w8 u" g
//
1 u0 ?% d/ A, s4 L 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";* e0 [ n' N6 \: ]
try {/ Q b4 l8 D9 P/ q6 x
past=con.prepareStatement(sql);
, f1 W, v9 d3 ? rs=past.executeQuery();1 t: t& x$ H6 B( A
while(rs.next()){, d8 ^. D2 S7 Z8 g- [/ H( z
- L( R/ L( v! j5 Q
// id, title, content, pubtime, author$ S6 G3 y! T1 X( G
int id=rs.getInt("id");# j+ Q1 _+ t, H, k+ v7 X+ N
String title=rs.getString("title");
/ {$ L- T% ?# S2 q" ^4 Z String content=rs.getString("content");
$ V5 Y ?6 B% @* B8 h1 P String pubtime=rs.getString("pubtime");1 n8 U- j/ ^4 Y" N
String author=rs.getString("author");! c: G7 K N. l J
News news=new News(id, title,content,pubtime,author);
1 A: w6 ~) W6 }0 T2 q2 k list.add(news);
4 F" N; X- T! Z* ? }2 r& m0 _2 E7 z- A: T
} catch (SQLException e) {
0 U9 ?" C, _- S // TODO Auto-generated catch block Y+ ^$ `2 D7 b$ f
e.printStackTrace();
' _4 T. j h+ X, O }: A8 j: @/ Q. y9 j. J
return list;
9 k( Y; Q7 r8 A+ c+ S4 Y9 S S1 d 8 `$ @2 i- H* T
}/ J/ F `8 i: \- u) h( K, v
}
) T: @) U* T/ G! k( k: k/ O 复制代码
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源代码以及数据库下载 : & r9 A. B5 r6 B6 w$ X; }- c1 O
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