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;
' t2 w' i* Q5 z3 p ~5 [ /**
9 W) n" ~. y0 F& {" w- r3 N * 实体类+ w, C( N+ a! M- {0 @
* @author Administrator; C7 d7 b6 a8 S3 @# V
*5 L0 X3 R0 g* Q2 p2 U$ L8 Z
*/
6 ?+ Q( j8 K/ d, Y* T7 ^4 P. m public class News {
' g+ i0 Q0 Y) f8 r+ Q' } j // id, title, content, pubtime, author
0 |8 z: D! d' v2 l/ f private int id;
1 L( j) m/ S# M private String title;" `4 P) w8 q( _4 G- R
private String content;6 V0 y* _; g' z) @/ z5 w9 E z. a
private String pubtime;! w+ y) k6 G' P( J& K. _
private String author;6 P5 t* u- a5 O! v! I
/**. T" E, s3 w/ U" d* V1 ?7 T" t
* 构造函数
' n6 k2 F1 M1 J6 p * @param author 作者2 h& w3 j( o- K1 r3 e( b2 k
* @param content 内容4 }' ?; |4 e) n. @! m! u6 W" `
* @param id 序号1 Y1 l' H7 U8 p$ ^& Q+ h
* @param pubtime 发布时间
0 @0 Q, p# \( G; Z, P( {/ B * @param title 标题
* c) ?) `! S! R/ }8 q */
" F7 F' z8 w: U* \! D. Z public News( int id,String title,String content, String pubtime,String author) {
* y+ h1 \' G8 T* V" Y+ w
3 `1 t, G2 C. z* Q% q# X this.author = author;8 c! ^8 b; i G- P
this.content = content;/ N; S' v! \# \( y& H; ^
this.id = id;
1 k7 P, J+ j+ a0 w this.pubtime = pubtime;
/ P' R1 p7 a D* e$ f this.title = title;
1 K5 }3 w; D1 C& s( u }2 h$ S Y6 n9 i8 E
/**1 f3 A) s! _+ y+ D
* 无参构造函数( z( y9 r$ Q7 c3 x. Q' a* t7 |
*/% c- R/ j( a: @" G* M5 Y* A' u1 b
public News() {
: A0 f# p! E5 \, [2 @. c super();
9 Y; o, A u) M7 A8 b3 b }/ `6 y, u: y: f/ o( D: d% e
/**
6 P0 }5 r- W7 {3 E3 [! N% ? * get ,set
3 J8 q* m! s4 o% ^! Q: L7 K * @return
6 r" D: J9 _, d+ P4 ]" x5 t# u0 v5 V0 J */
* R4 z4 e0 W W public int getId() {4 G2 a: K) P# N0 }: T( j
return id;
, C0 Z8 E7 z8 w% h }
% B: c% O, s4 l3 A1 M) ? public void setId(int id) {
& P5 v2 V. Y% c% o. z4 D$ X this.id = id;
; j& S: x5 ]& |6 c9 S }4 [0 F( U, x3 y; ]% k5 m3 @
public String getTitle() {
) r0 P3 x8 Y; K- `# N- r: N# W return title;
5 R2 Z, ]. @: ]2 f( n, t/ } }) U) i x& d3 T8 }3 Z2 O7 ~
public void setTitle(String title) {
0 a& M0 n$ Y& [7 f; [9 R this.title = title;* {. I$ r% F, ?, p8 J
}$ x2 j1 y8 S5 u/ m( q
public String getContent() {% C$ j; n8 [2 [% G0 W# X
return content;4 q& J8 }4 g c, |* R) t1 s
}8 M& p Z& x7 g3 E
public void setContent(String content) {
0 r4 X+ q' Q+ _# C5 R l7 A this.content = content;
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public String getPubtime() {. p6 ]* ?# W% b+ x$ }; y* u6 U# g$ E( U
return pubtime;
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public void setPubtime(String pubtime) {6 m( b+ y$ {0 h9 P% G
this.pubtime = pubtime;" S Y9 s* D9 ~ g# S' w* m9 f3 m# ~0 [
}
( S' y6 h9 I' v) u4 D4 s- r public String getAuthor() {
) V5 W. h' B* ?8 Y( `# y return author;6 H" {4 T/ O N. K# c) ?9 l' H
}* E+ s# T+ _+ C* n* i
public void setAuthor(String author) {
# N$ R& c( `' X. Z; a [ this.author = author;
$ x: x- Z! e* ] }8 _+ ?5 g p7 N' A
6 Z5 N1 J1 y* E1 S8 _: ^* } }" X2 e0 ] T( ^# b( G! h
复制代码 package s2.jsp.zhangxiao.entity;& @6 s0 M" ]- Y
import java .sql.PreparedStatement;# d/ t. [8 d8 Z' t n& F8 T. U+ w1 h
import java.sql.DriverManager;
& X9 W+ {! e G2 N% m8 o- @ import java.sql.Connection;3 n/ S3 |& h( H K) g6 @2 H: w9 P) W
import java.sql.ResultSet;
3 v; e6 S2 B9 [# W( ?1 f) _6 \% E0 q6 { import java.sql.SQLException;& h; H& r3 z) Z% S
. c3 Q* S2 l, |) }& L. j
import com.microsoft.sqlserver.jdbc.SQLServerDriver;
. ]+ l$ Z# B K& A 9 P1 H* \ u5 y6 r2 Y/ j8 V; Q) V/ L
public class NewsBase {
9 @" a7 W& H4 S
9 ]7 {5 H! U9 C: [, u* N private static final String DRIVER="com.microsoft.sqlserver.jdbc.SQLServerDriver";2 P8 Z- ]% D f
private static final String URL="jdbc:sqlserver://localhost:1433;DataBaseName=news";1 e6 d2 j' q& {- T5 r& `, ?
private static final String DBNAME="sa";
- c" h1 Z) T0 D' M6 P2 k$ m* G& I1 } private static final String DBPASS="1234";
& I3 X+ O, h; o5 o0 e; a6 Q
% d- r1 B9 B! H' v- G3 C, n, } public Connection getConnection(){4 f# Q5 I& [2 L
Connection con=null;4 ?4 @1 t- ?7 d# |, {
try {
( x+ z& @/ D/ ?; `$ H) o; F& B Class.forName(DRIVER);
7 k; q* `+ i1 D' B con=DriverManager.getConnection(URL, DBNAME, DBPASS);$ Y$ }; |& y- {0 H
} catch (ClassNotFoundException e) {
4 R7 T( _% t- g" t6 ^7 o; x System.out.println("加载驱动异常");4 r. d+ N! I7 D
e.printStackTrace();
( b" S- c' |* G0 B6 R+ D5 o5 O; N } catch (SQLException e) {! L0 F" J: E, f% l" p9 y* c
System.out.println("数据库连接异常");
! j. d6 }3 w; s0 y) K6 \" O e.printStackTrace();& M: L. N, m3 E0 r" f( a9 t6 l7 g9 Z/ T3 U
}& J4 }8 p9 x/ k# U
return con;
. W" [5 D k+ e4 g# v }
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public void colseAll(Connection con,PreparedStatement past,ResultSet rs){5 v* C6 z: k2 K6 x5 u8 C
try {) m$ Z" F9 ?9 U1 Y1 ^, W: |
rs.close();8 u# a& O7 V+ d. v
} catch (SQLException e) {# X' d& \! N* q# T
System.out.println("");
. U( y; p z# N e.printStackTrace();! _$ c Y7 ~7 K$ n, f- o: H
}
3 G. r O4 D6 g9 b try {+ k# g" G' ?; P" ?
past.close();
% @# p! i r+ d( ] } catch (SQLException e) {
" _, m/ e5 }' q# v$ R/ F System.out.println("");
2 S! o P7 o( x6 N/ ]6 o e.printStackTrace();: w6 f1 m1 H0 k, o3 D0 A3 m
}6 T2 S3 G3 Q7 V/ E- a3 q1 `' E
try {) T D! C0 s0 u
con.close();
% B, Y' [: n4 |9 A: w5 J; d2 w } catch (SQLException e) {
7 F. ~% e' I/ W6 H // TODO Auto-generated catch block d1 ?" v8 m) f I# p
e.printStackTrace();+ g) s/ E2 O! x2 ~. a8 S. V
}! t: r- C9 c( O# h& R" x, d
}0 ^4 B+ `" {# K& k
8 i: h/ r+ a& |* y$ m
public int update(String sql,String[] getValues){" z- u* R& U q, `2 f
int i=0;+ S& p; v1 d% a1 {5 M1 A8 c* G
Connection con=null;
& F5 n( H R1 c& b2 D PreparedStatement past=null;; x6 q( {3 l! Q |
con=getConnection();2 G0 r! x* g0 g2 y% U0 p, j
try {
, i4 G( k8 L& a# D past=con.prepareStatement(sql);% O- b! e. Z. W: u" \
if(getValues!=null){
, V# [/ B/ I3 q! e1 M c9 D; m for (int j = 0; j < getValues.length; j++) {' J# k" S y5 z% f# ?0 r
past.setString(j+1, getValues[j]);$ G6 Y; V+ P) U6 a0 x; m, T) b
}
& \. O0 a' y, x* `0 z }
6 s% J1 w& Q; y i=past.executeUpdate();1 a+ P% O1 z; { x3 R* j
} catch (SQLException e) {' C" ]: U/ t+ O3 f/ O3 @
// TODO Auto-generated catch block0 i& X# D4 X6 x, ^; d
e.printStackTrace();+ j$ k+ B$ s" x
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return i;
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}8 D, G) g4 x) H- p% I" O- e
复制代码 package s2.jsp.zhangxiao.entity;
- F5 O Y [/ h6 c& P9 _
$ r7 C* C9 p9 O- R4 } import java.sql.Connection;
L$ r, _: u( W$ y) O import java.sql.PreparedStatement;
" s6 O& S, U( f+ H X3 R import java.sql.ResultSet;
# ?1 T; X }1 [# U2 J2 T& H3 C import java.sql.SQLException;
' o4 D2 Y* B# ^- N; D import java.util.ArrayList;
3 h+ C. V/ t0 B n/ `+ a import java.util.List;% w: P# S# |2 X+ \" O$ K
; t, d% E; l* j# q) p import s2.jsp.zhangxiao.dao.News;$ D( c# P b* x! P! D3 x& H
( U+ T% D4 Z7 d- D1 g public class NewsDao extends NewsBase {# G7 f9 _) Y5 j; d: g% R
private int count =2;, V! }6 }3 K6 h
1 S+ \ `+ `* I% ]: ^& ~ /**# ^' _4 p- _* b, z, [, ^( O
* 查询总页数
n( x; i' T9 | * @return. z6 S. R" a& @
*/* p/ H! [; G. \) X3 d0 h+ [
public int countPage(){
* d2 f4 E h1 @: _- j0 S W6 \% L int rows=0;
. G( @* [# W, f' E$ G Connection con=null;
- M- F+ Q5 s# U- p3 h PreparedStatement past=null;
, F8 F) w4 t6 g ResultSet rs=null;
& V' Q) b! B/ [7 e7 \4 o con=getConnection();/ ~2 q; i4 ], v. P
//查询所有的的页数 返回受影响的行数
( Q4 q1 L I0 H( ~2 L B String sql="select count(*)as c from news";
* A' a0 T w' y% n Q try {# m1 Q5 Q2 r3 T' N9 f1 a) _
past=con.prepareStatement(sql);
3 N2 L+ Y$ u5 P7 K6 K; Y) k rs=past.executeQuery();+ `( y5 q _) u7 _
if(rs.next()){
3 m7 @$ M, u. Y //将所有的行数保存到rows 变量里
; ^! {1 R- X3 l rows=rs.getInt("c");
$ i3 {8 B1 A9 s- W# S; i! Y //如果显示两页 count 代表显示的页数 ; E4 r, C m' }7 @6 R. n
if(rows%2==0){
3 d0 V7 C2 X# c; S: F$ Y rows=rows/count;( L6 ?% z! @ X; K1 F2 k
9 a: g z6 |8 G: r1 U3 Z }else{
$ g. o* O9 J% b" L/ U4 d5 ]9 w rows=rows/count+1;3 b* i, a: N/ ?& ]
}# g& F q% \, K; A' Q( C; z
}
! ?) Y/ C2 Q) x+ o; V. y% b. d: K } catch (SQLException e) {9 @) Y1 n& ~% {& Q
System.out.println("查询总页数方法异常");
c: \9 U1 }' N9 Z% u+ |; u e.printStackTrace();
6 F* n( ^3 b9 M0 w! D% f }* D6 Z G+ @6 k/ _* d/ K
return rows;6 `8 }- p1 {' i# i
}, T. ]; H. i1 |0 i! {4 c
/**, K% ^) t( P+ I1 O* `; I
* 根据id删除信息
9 F B. B3 c2 A) m9 ] * @param id
' D% V3 n0 q4 T* t * @return
T. [( h7 }! T1 o */' Q: j* r+ x/ `
public int deleteNewsId(int id){
$ G! n/ Y1 _. W/ K4 c String sql="delete news where id="+id;
1 z6 R7 p# d4 v0 i$ ?) x! r return update(sql,null);2 `6 L4 z i" P
}+ \7 f- {7 \- z9 N2 A
/**( k( X3 q7 L) s& @0 m
* 根据总页数分页! i& Z1 F# }/ R& F# q7 l
* @param page
& R% k, k5 U. ?$ p7 r8 ]/ t6 M# F * @return
: Y. ]( a% g/ Q; r' e [( D */
) Z3 r9 K+ w/ M# S public List getPageList(int page){
8 z) g3 B" |# ~. Z( b+ H U# n Connection con=null;
- H( V" R' W/ U5 q1 U) U' G* h+ Y PreparedStatement past=null;6 L& @9 C& H# v+ \3 j) [
ResultSet rs=null;4 k Q* P# _. z% w" f
List list=new ArrayList();+ k( W' P. i1 {+ i; K
con=getConnection();
/ _4 V; K# m& ?# ]# A& o+ ? //
* x) y: T- X, |9 r; 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";
, I. {1 y6 L) z7 N; T& P try {
/ j; Q' x8 D4 H past=con.prepareStatement(sql);" x, d% _) o% d- w' N. ^
rs=past.executeQuery();( H: M3 [' |) S
while(rs.next()){# n# \6 W2 h+ _: k' H
- z1 C" u7 d+ c5 R: I5 I // id, title, content, pubtime, author: f6 C- G: }9 Z" m0 l) J
int id=rs.getInt("id");
0 `( o+ q3 U9 | String title=rs.getString("title");' W7 t* Q0 y/ m! Q6 L" `. }$ }
String content=rs.getString("content");
% \/ ?4 m& f' |' m7 h3 o& d String pubtime=rs.getString("pubtime");0 P- i6 Z1 W. d$ `5 c5 C3 |
String author=rs.getString("author");
5 q, k- V2 N, r6 n: V& e; @ Q News news=new News(id, title,content,pubtime,author);
6 r" d) v% }+ q) @8 \7 B9 ^ list.add(news);* m; X, V+ N8 X! }
}) C2 q& G5 {% K: C7 Z
} catch (SQLException e) {$ |5 k: Y5 H5 F' x. Z2 V; b3 w
// TODO Auto-generated catch block( |* K" Q! \. f9 U7 e
e.printStackTrace();
! ^! s7 m/ D0 t% J! z& n3 B; c. E }
v: Q8 G7 A, r return list;6 V5 `) Z. t' V' I. J J& [5 E
, N, Z# E8 A B: t }8 d/ W8 W5 }! I# D1 T8 w( p3 m
}, S* A8 F3 V$ T. e! r& s: C' R
复制代码
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# g) V/ U: @0 v$ l7 p+ U 源代码以及数据库下载 : + d: f! N' a; I
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