TA的每日心情 衰 2021-2-2 11:21
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package s2.jsp.zhangxiao.dao;* {$ D: b- b+ S: t2 m3 s! u
/**
, `8 J3 t" L" a0 u9 l& U * 实体类# U. C3 U+ n' t: J& _
* @author Administrator, F! j% l" D5 n. F
*; i4 H, \$ A( X# @3 ~1 h6 W" R
*/9 i5 @/ f2 Q7 t0 {6 _( H! e
public class News {: q. l0 G. F! E! \: u- n
// id, title, content, pubtime, author1 K5 X8 N3 M. C1 Y8 |4 o$ |
private int id;0 t6 u/ d+ E' M3 v+ y& @1 g1 Q; g
private String title;6 d4 ]: n+ V& F# Y5 r4 ~
private String content;& Y5 U6 n5 i! W5 W1 ]3 l2 y
private String pubtime;3 t' {' W: k; \- ]1 Q" D
private String author;
' B. t" ^! ]6 ?- p /**& N3 k# s6 g; k+ {( k$ Z8 O
* 构造函数
. C) e& x W+ l! @4 C * @param author 作者, r( G. w$ ^3 }6 w8 @
* @param content 内容
) k Y. {1 U. q) _ * @param id 序号
! y/ q( n$ x# I, { * @param pubtime 发布时间
: \# }# Q. M: s/ l$ ?. R, ^; J. k7 k; h * @param title 标题
% l1 A; a: O' Y) p! q) E7 a */
5 ~; C0 N' ]+ m) {- F* l public News( int id,String title,String content, String pubtime,String author) {7 s, W6 E1 }7 I
* _4 y, x) n( T7 C9 V# \: P
this.author = author;
$ K/ U& D, W2 B' r! A this.content = content;! ?9 Q I7 T( E* D; e; K/ }
this.id = id;% k$ `* g* J5 u+ v D
this.pubtime = pubtime;
O- t5 N# j* f0 e. |1 v this.title = title;
/ S) R" A" q7 k: T: g4 B }
" p8 _8 w( s- U /**: X: W- z, E$ f- q
* 无参构造函数. i v) ?* B$ _5 P5 Z* s9 l
*/
, c: n1 x+ X) C6 I, J public News() {
7 U7 \% ^9 Q, S7 `6 r' D super(); u" j( E k5 i9 y
}
0 q; S, R4 T3 i; F$ ` /**2 H7 r% Y1 X) L6 M
* get ,set
! W9 ~( S8 W" k: c* A& }/ w' V * @return. `6 j; g, z% M) {
*/
9 q" \* X L0 b public int getId() {& Y4 Z; t- z$ s, l; n1 I+ H
return id;' |4 U& H% _; t7 \; {4 u$ w+ I
}
3 ?5 B: X2 c! \6 _4 Q* D+ l6 w public void setId(int id) {" k* [; h/ u( W3 J5 _
this.id = id;9 s, h" K( O" Y" o: t
}9 `& o6 j" i5 W6 t2 a6 _# E
public String getTitle() {
' U7 S/ n4 _3 |8 U2 g# g return title;1 W# X1 q; D; h6 P8 p: y7 J9 }
}
' _/ u3 G. R6 G5 G* O# @6 F9 p public void setTitle(String title) {. o% D' O& V7 P, v+ T
this.title = title;5 b6 {8 Y& X' u
}1 K/ d; b9 n3 {6 i2 D) G
public String getContent() {4 K$ ^/ \% X5 h
return content;- m' B- r4 a1 C+ E: {
}) G; h. N, I3 J# Z w
public void setContent(String content) {
% v/ _$ t" }; ` this.content = content;
; ]: T% V+ V5 O& | }9 L1 d: l* l) H! A, u- r( y3 M. x
public String getPubtime() {
, Z8 m+ Q% u) `6 g5 c' Z return pubtime;
, s G: Q2 t: M3 e; ` }
& _1 V: d( c" {! \# A# x public void setPubtime(String pubtime) {6 |% H9 D6 P6 b1 U/ N. Q& t
this.pubtime = pubtime;
0 g1 I# y5 ^5 q8 P' { }. ~, e6 s; Z7 j: V4 J' B/ K h
public String getAuthor() {
: W' W# c2 g, M1 o return author;
0 W/ J* g# q& B" a, K: N9 O }
/ x' [( X- V @ public void setAuthor(String author) {
, ~( w3 |" W J/ Q* n+ @ this.author = author;
, U1 Y$ o8 u o% L% X }( e8 t Q6 U: ~
3 B+ o+ Y: [) Q4 z% }6 H: l/ q }
0 [8 x# P- `$ A: f 复制代码 package s2.jsp.zhangxiao.entity;
. @$ @9 ^: u2 T P$ W, K+ Y import java .sql.PreparedStatement;
6 [" C6 C. m' K+ e, }1 |' V import java.sql.DriverManager;
$ i. J- j& t4 Q% e: i- m import java.sql.Connection;5 Y4 q7 m+ W l: s
import java.sql.ResultSet;2 e+ ?* L1 g: x
import java.sql.SQLException;" |( D$ O& A! Q$ E$ m) A& o
1 ^5 ^1 I, g# ~' y) D4 q( G
import com.microsoft.sqlserver.jdbc.SQLServerDriver;
* D' o2 [+ v( p; G9 i# e r: t$ B
) i: g0 \ |- G1 b5 t public class NewsBase {- J* y% f5 R z! L) B
# o1 A$ E0 t3 v2 k
private static final String DRIVER="com.microsoft.sqlserver.jdbc.SQLServerDriver";
1 q ]4 v/ o6 \/ [9 F) a private static final String URL="jdbc:sqlserver://localhost:1433;DataBaseName=news";4 H7 ?* B& z7 A- @7 m" m! m) s4 M
private static final String DBNAME="sa";
* A2 s3 ?4 O4 x2 ~# p4 z8 m private static final String DBPASS="1234";
7 p+ @ T7 j$ t
0 ^& p1 ~9 w2 R1 Y2 q2 U N public Connection getConnection(){
# ]% Z6 J# k0 U- o Connection con=null;3 e$ K2 C" H w E+ Y
try {
/ ]/ k5 G9 ?# e0 ^* W8 i4 f2 v! _2 B Class.forName(DRIVER);
$ E% q! T: [$ c2 k+ t con=DriverManager.getConnection(URL, DBNAME, DBPASS);
1 r3 X7 y' u; Q4 w } catch (ClassNotFoundException e) {
& d, z9 O/ H1 [ System.out.println("加载驱动异常");
* k' n% ]* |. M: J. w3 b& U e.printStackTrace();
8 S) @2 e& R& H1 ]/ W$ m } catch (SQLException e) {
. _% R" |) }( p System.out.println("数据库连接异常");/ K$ X2 w' d' Y. m
e.printStackTrace();
+ N$ r5 U [8 ^$ P' a$ z2 q" r }
$ `* s- Q4 ]0 l# w1 `% _ return con;7 ~- u ^, P8 {' K, H* j
}5 J! G; b+ |! G3 |, G
" x. P% N1 G; t' c& u
public void colseAll(Connection con,PreparedStatement past,ResultSet rs){
! D w7 `8 ]3 o try {: _% X9 X+ |- K/ z% `3 g$ ~
rs.close();5 C( h" O9 S8 I/ s
} catch (SQLException e) {! N' G2 t0 k1 b1 U
System.out.println("");
h. d3 F/ S; a) ~% q e.printStackTrace();
- X' \8 W4 w. y$ \ }
" `# m* F# }& E* Q6 H# @ try {
7 G* x( s6 w# @" S | past.close();4 s4 D3 O3 ~7 _8 t! @
} catch (SQLException e) {
9 r. d4 T6 n- v System.out.println("");
: J/ D. x# q `9 f9 O# l6 d e.printStackTrace();
3 B6 C5 W" W3 U0 M! t1 Z J) d$ s }: f6 {5 J8 m) c% \+ |
try {$ {' X" a; {3 m) D" `
con.close();
: a9 p! q7 N0 e9 [" g# G, W8 F } catch (SQLException e) {
1 k) ~$ m) b+ l+ a: A$ F& s // TODO Auto-generated catch block4 _3 `8 ]- H1 `! q! U0 ~2 Z+ ~
e.printStackTrace();; _0 B: Z3 B3 @) w/ f$ K
}
5 a% r, X: g8 D }! T- ^9 f8 j, ]$ E6 Y( ~
# f2 \8 d: U! [" J
public int update(String sql,String[] getValues){
' A7 ~0 u; e, i, E( R+ r int i=0;
4 s3 x, Y! _; I4 |' I" T, c Connection con=null;
' \/ j, z }3 W" F4 X1 s8 m PreparedStatement past=null;
. {% J8 B# T* j con=getConnection();
. x% I+ u; k; p8 X: b( n' X% U8 [ try {
+ U, E; \2 X5 r+ o4 K past=con.prepareStatement(sql);. U+ N$ a1 U1 x: l# R* E
if(getValues!=null){ U. {, F3 g ?- H0 S& h
for (int j = 0; j < getValues.length; j++) {; q! v+ x% f/ e D1 x: k
past.setString(j+1, getValues[j]);
1 B5 g8 G2 Q6 m/ b2 |6 y- n( k }: G& _) [! k4 j' z% ?$ ~
}7 o( K5 h3 w* w. u
i=past.executeUpdate();3 w/ _- k. w. `0 n! V
} catch (SQLException e) {
: s' U' \, s7 |, z // TODO Auto-generated catch block
5 d+ ?; J* c8 D- h e.printStackTrace();2 @# T- A" h: ^% ?8 @' K$ E
}. g: H* \2 ]% f K- P! V
return i;
: ^6 U, @, o6 f' b7 D. |" L5 k }
; e4 L* w5 {- r X }
4 b9 L' d# ^/ c% K- l6 d" O 复制代码 package s2.jsp.zhangxiao.entity;8 U* N, O* ]9 p3 U& R
, \8 ^" e U3 |2 b3 a import java.sql.Connection;
v7 Y% r& k$ O* O" ^; o import java.sql.PreparedStatement;! \; D" A6 I+ }/ O& t
import java.sql.ResultSet;
) e3 p1 F, y& L( w$ d2 _ import java.sql.SQLException;
& o. M( Q2 n3 K. Z4 p6 y- H import java.util.ArrayList;' {* `4 {# n/ y6 L8 M
import java.util.List; y$ v, ^; l! i$ t6 P; b$ @
$ m. a6 L+ R0 R
import s2.jsp.zhangxiao.dao.News;
2 R$ E/ [$ e1 T9 y : X# v$ u- b+ ~. Q" e1 F
public class NewsDao extends NewsBase {3 F5 i2 ^, o5 ~( ?
private int count =2;
' _3 t. w9 w4 @, m 1 n. j$ E0 `3 o8 t- y$ G( h5 Z
/**5 l, k% E# l* \3 |% f6 |2 g& e! W5 X
* 查询总页数4 q4 ]; Q j0 G7 D: A
* @return
) [$ i S$ m' Q9 A7 _4 i/ M" R1 Y */
/ R2 f8 p7 L+ w' g public int countPage(){
" d# s! c* X0 k2 Q* D int rows=0;
' d+ K/ p* m& w# N$ u: v Connection con=null;$ h+ @* ] e* [: g, y d, P) q% O) N
PreparedStatement past=null;2 e( M: ?9 x+ u- {* o7 s" y
ResultSet rs=null;+ x O* U9 s5 G5 S v/ M0 V
con=getConnection();
3 Q; l& \$ V9 r( |' J9 H //查询所有的的页数 返回受影响的行数
" G9 w4 g+ r) Y6 n6 w+ m8 ` String sql="select count(*)as c from news";2 S( p$ @! B5 J. ?! I: T g$ D# B6 x
try {) E7 u5 t# m+ q2 q) P
past=con.prepareStatement(sql);8 K" c+ i4 j `2 ~
rs=past.executeQuery();* x; ?) f K0 p
if(rs.next()){4 O* B) \ ^4 N$ K
//将所有的行数保存到rows 变量里: j$ b. S7 `$ E! y4 u2 v3 _! J
rows=rs.getInt("c");" Z* a- U2 {5 i- F+ w
//如果显示两页 count 代表显示的页数
$ _/ {' N% r1 x9 c: o3 G if(rows%2==0){
3 C- ?! F) b8 i/ y/ A rows=rows/count;
( N9 h# I! l' L6 j7 y, q 2 b& n: I4 Y! s, H- J: I2 f
}else{
5 i [! P8 W; r& Y+ {% f rows=rows/count+1;
. S" l9 x% P' L3 a, J1 x" F S }! H; t# e3 ^( B( m ]8 @
}
4 w0 j. S! G$ q. F- P } catch (SQLException e) {
, c N: Y+ o3 q0 ^: I: T System.out.println("查询总页数方法异常");
! G8 G- `9 \1 @8 E3 n+ g" b- u e.printStackTrace();
3 p7 x p; I! }3 y' J1 L) a }
$ q* n8 F1 s U" W% a# w return rows;
+ V3 B8 L+ f7 d }
% S) g! ` B; z! w2 S+ Q4 W1 o9 Q /**
F* { P" g q; Y; ] * 根据id删除信息
, P' V; L- E% d4 c7 @ * @param id' f6 C7 K5 k- Y! a
* @return o. f3 G: k9 z
*/
. B( M6 f- n1 V8 ^# o l6 n% V public int deleteNewsId(int id){
% b7 v5 k" `: {* O; o' K5 w- ~ String sql="delete news where id="+id;
, a9 j% N! U! V* O" u* [1 O return update(sql,null);/ D1 _0 w' p. O+ ^. H8 R4 a
}6 }8 _! O0 k5 g: i
/**
% A9 y; Y& c3 f2 T* [% o * 根据总页数分页
* O- X+ U+ B- B n/ b% L * @param page
! X/ X3 n4 i- y$ O/ p8 } * @return: ~6 w# Z$ {) e
*/
7 T+ q8 p* o+ G public List getPageList(int page){
5 ?! i5 m* I+ ? Connection con=null;
3 e9 R; d; K$ q' ]; O PreparedStatement past=null;/ ?( a: h& w1 f( G
ResultSet rs=null;: v0 ^- E. e' L
List list=new ArrayList();
6 \6 O! n3 _ b$ Q( J8 [( o con=getConnection();
' b. U% ?& g+ y; B //
9 R" |. Z7 S' s# w 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";
& y" m \! a- x" \ try {
3 O% n6 _, w- O9 l: m( F: m6 s9 H" } past=con.prepareStatement(sql);# O1 {) A& g5 `, f; o2 v
rs=past.executeQuery();
$ P( c# B% T: {/ a P* m while(rs.next()){ ?& U, | T% w- a
) C% x% X. q. S" R' R# W( p1 D
// id, title, content, pubtime, author4 V! U; a6 |- o9 n8 _9 C
int id=rs.getInt("id");
/ z+ X& ?+ M0 j% `0 N. t String title=rs.getString("title");) ]2 ~7 n0 l5 H
String content=rs.getString("content");$ Y+ F0 b4 V: X4 t
String pubtime=rs.getString("pubtime"); R0 I3 [; t# m8 g
String author=rs.getString("author");
" y/ v- ]4 y0 r" }% C& [ News news=new News(id, title,content,pubtime,author);! V( a4 T& R6 p+ h: @0 G
list.add(news);6 }0 J7 Y, q, ~2 D) X; g
}
3 `. s( B7 F5 V } catch (SQLException e) {
* ]; {7 g6 @ n6 T i" p z // TODO Auto-generated catch block
6 B2 t/ I3 I2 Z$ s/ J e.printStackTrace();, H: {" b- z# \$ a4 c2 t
}
; y& N- G& ]1 W0 O- s- }. w return list;
/ s! c2 }7 |" O5 M
" s( Q& Y" F0 T9 h# z) B0 B }
/ q( e4 B0 |: p$ p ? }
& T2 _/ U! e) k% J 复制代码
' m; _( M* S6 m4 M7 c0 ]
. X9 f" \! L f& H 源代码以及数据库下载 : / `8 U/ c& J" H" g
4 W+ K3 i# K7 V! J' F+ L
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