TA的每日心情 衰 2021-2-2 11:21
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package s2.jsp.zhangxiao.dao;/ O1 `! F& f& y7 z) q6 x8 _) |
/**% }! x! }' J+ K8 z r
* 实体类
, A A) Q* [- y; T7 e P+ B! j * @author Administrator6 C# K: r) \# h: Y% q! s
*
7 z/ G' |, B, ]1 m, F, f( T% ^ */+ ~6 q' E% e# G3 V' J
public class News {
2 t* k5 ]0 K. h' Q) [3 V // id, title, content, pubtime, author
. _" T$ e; R+ x$ H private int id;
& q, O d, a8 W6 P private String title;
" u: \, u0 h5 B, z) j" i private String content;- y2 V, o7 J. d9 [( i+ A
private String pubtime;
3 j7 Y% M, ^# r) _* ~ private String author;
) Q6 Z. W# F5 x /**3 k. D! r% W: m
* 构造函数! A7 r: l. Y( |. G% T
* @param author 作者; m! B6 L4 `# `4 d/ [
* @param content 内容 v. G( R3 G/ `$ I1 P
* @param id 序号
: h7 @- u+ S3 `( Y * @param pubtime 发布时间
" B9 F D$ j$ g) `% _7 D. z: b * @param title 标题
. s( q$ ~1 I5 m1 i# P% E; A+ j8 T */
2 n8 X6 Z: ]" ^: [) l( n, M public News( int id,String title,String content, String pubtime,String author) {
8 j# ^2 _, O+ G 8 ^0 ?; G/ I# ]' m5 {; N* ^$ _
this.author = author;' k; ^ B% K3 |( h: D" j4 I
this.content = content;
9 I9 \) U. F% u" B$ V this.id = id;/ L. S8 E6 D/ A& U
this.pubtime = pubtime;
0 w/ j. w8 G3 P" _ this.title = title;
2 j; x1 h3 x" R7 r# { }
4 H4 L+ t* ~! x) b0 q$ B7 G /**
$ y3 n s6 b, h+ }( X) I" J3 T * 无参构造函数
4 P( A( @# W0 Q) V1 X" N( `8 N */
8 i& Y& S" ]# ~& k" c& c6 V& S public News() {) o( h c! Q& c- p) s$ m' M
super();+ g% r" v7 h2 D9 q
}
- }9 e9 ]0 Y& j" e3 ] /**7 @. x! }9 }8 Q/ G* {: i
* get ,set
P0 U/ S& H3 ~; m) `9 ~1 `$ O * @return* E. L( x3 M: `+ a0 M6 W. [ L
*/
7 ^/ v, G4 c6 J3 l3 H: t, w public int getId() {
' a1 V5 ?# n+ O Z% D7 @ return id;- w# v! f4 b3 g" ~
}$ R/ q6 O) t% c/ F/ H
public void setId(int id) {
. u& h! D+ Q4 S! }3 i: P) r( L$ t this.id = id;" c' y* N1 N3 T4 }/ `
}
% }+ _4 _+ w+ n9 R* F' h4 J. Z& N public String getTitle() {; d) Z3 |9 B, H8 A% l8 p
return title;( q; s7 t- A9 N" S! v/ y9 e* s
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public void setTitle(String title) {
1 o9 F/ L1 e) E) I this.title = title;
4 C% W" T! W6 ^, i2 e }% e2 a2 c4 ^" t O! l
public String getContent() {
7 [, B* R" C4 J9 _7 r return content;
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public void setContent(String content) {
/ J7 n4 c7 D* D5 F+ ] j this.content = content;: z8 M: r( B+ h( M9 {
}) S. Y# Z) |+ {; ]8 a- S9 O$ k7 G7 O
public String getPubtime() {
( Y" s+ _% a7 x& T& l) T& |2 R return pubtime;
! N2 f6 f& b6 J6 R/ R% m }
2 ?" v% ~$ h4 c+ t0 R8 _ public void setPubtime(String pubtime) {
$ i2 x5 f n8 X5 T0 A- T; C this.pubtime = pubtime;2 G0 z( B0 A9 A* ^- n8 F0 {6 z
}+ K% |2 o; Z8 u8 h- z" [& E
public String getAuthor() {
, ^0 H5 T" T' Z0 R+ { return author;
- C: d/ {6 q- N2 m# W8 D2 x }
6 e; C6 F+ y2 Y public void setAuthor(String author) {' O4 J- R& X: `- j$ e# m
this.author = author;
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}
3 E/ J9 n3 ^$ v, ^6 T6 a 复制代码 package s2.jsp.zhangxiao.entity;
$ h, l3 f. \+ e& W3 x: d9 d import java .sql.PreparedStatement;: q9 {: ? n- U$ g+ ~
import java.sql.DriverManager;, C% C: I+ A Y6 v7 \
import java.sql.Connection;+ P2 X( O6 V. N
import java.sql.ResultSet;8 L- Q: U! j( \7 v7 b
import java.sql.SQLException;
! r. \% r" ~) L 7 u$ S( S) w- I) j, M
import com.microsoft.sqlserver.jdbc.SQLServerDriver;+ p7 Z" s+ c/ ~ w Y% @
3 i6 H5 W+ q7 A% B public class NewsBase {
1 D9 L/ j: o( e$ g 6 k9 r% @6 T/ o8 K3 U' ]
private static final String DRIVER="com.microsoft.sqlserver.jdbc.SQLServerDriver";! t( D! L6 a6 n7 k7 Y( Q8 k ~& t5 F
private static final String URL="jdbc:sqlserver://localhost:1433;DataBaseName=news";
- L5 ^" S" n, v0 L( c! E2 ~ private static final String DBNAME="sa";& z: F6 Y3 u+ m1 T0 L2 }2 d1 z2 p
private static final String DBPASS="1234";( v5 G/ |9 P q- ?, z" b
; X. @# [* R) c2 M2 s6 A5 Q. Y$ ?; s7 q public Connection getConnection(){
# B$ G% c+ Q% s1 n) q. t) ` Connection con=null;# O" U4 v3 |; E4 e) v( j5 F* W
try {" C) z: X* @5 M8 \* t
Class.forName(DRIVER);
( G/ y. A4 D8 n con=DriverManager.getConnection(URL, DBNAME, DBPASS);4 p" t0 V! \# ^/ u/ o( v- ]; r0 |8 e
} catch (ClassNotFoundException e) {
$ Z9 U# W2 T$ K System.out.println("加载驱动异常");! ^7 s: _, [" `( q
e.printStackTrace();: g4 A4 O6 k' l& T
} catch (SQLException e) {9 ~5 f8 B/ f" Z- E+ G
System.out.println("数据库连接异常");5 Z7 M! l' G( F D) d/ `
e.printStackTrace();9 T+ a/ ^ g, i. }! F
}
/ U1 {: v" t- Y0 n W8 I9 u. x K return con;
, l! p" b8 N! O% j: E8 k# W; X9 b7 a }
. t4 q. \8 C" k1 o
- W* E/ n6 ]# T! B public void colseAll(Connection con,PreparedStatement past,ResultSet rs){
/ l* O! @0 {* x+ H5 B) m try {* X% ]# Q% F1 E+ E
rs.close();0 r# {, ]( }+ T& W
} catch (SQLException e) {0 N" v4 r, A9 X+ M
System.out.println("");
4 U, R* \% O8 Z1 ~5 D9 T e.printStackTrace();: \ M) y8 O1 Z" y1 U0 L9 U
}
/ e" ]3 n7 P6 d4 D- {. ` try {: o# M( p* v; K* J6 H
past.close();
# P5 d; ]! }+ v. d: y& v } catch (SQLException e) {
3 S$ \0 m& m7 {* i8 d% i System.out.println("");/ r/ b* P: i( t( g7 n! Y
e.printStackTrace();
6 V* ]1 [5 \/ H* G9 I$ E }
0 y& C8 q. |; V9 U, T; k$ J try {9 \) H# X& S" J* @' o! s
con.close();
) x2 _0 N- k3 r' ] } catch (SQLException e) {
; V6 W! l ]9 w // TODO Auto-generated catch block1 F7 w. E/ D$ g8 P2 L W$ E
e.printStackTrace(); B. m" o$ ]) {% Y! u$ L
}2 m/ p7 @) A' { T+ d9 Y
}
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public int update(String sql,String[] getValues){! h8 n7 `1 v+ s% Y5 g! B
int i=0;( u u9 H$ Q7 j2 u
Connection con=null;
6 P" b% G* H* Y& V PreparedStatement past=null;, V4 Y& E8 B0 f
con=getConnection();9 W/ z; r. K( X
try {/ n. w; V- p A9 d& q
past=con.prepareStatement(sql);, ]. q/ w" r2 K, k5 t3 e+ b9 L
if(getValues!=null){$ |$ x; r! I* |( ~5 @% Z0 D/ ~1 K9 T9 N
for (int j = 0; j < getValues.length; j++) {
' J0 ]$ w4 I, j4 x! u past.setString(j+1, getValues[j]);
& c4 j8 w0 Z% U }" A: g; j3 H5 M& u
}
6 C. P1 i9 u8 @1 ` i=past.executeUpdate();* Q6 q$ F" s7 p/ ?
} catch (SQLException e) {3 j7 \' r$ |- G4 N3 R
// TODO Auto-generated catch block
& L! a4 b! C6 G8 d e.printStackTrace();% X- `" ]. F' k# X9 g Y
}# g1 o1 b: q; W
return i;. D/ N' D7 Z2 ^
}# d* [1 X* B2 ~# K
}+ x) ], Y$ l2 F& E
复制代码 package s2.jsp.zhangxiao.entity; ?+ i; Y6 c H8 b/ x- O) S
' ?9 g' W4 m7 Z* Z$ I; v
import java.sql.Connection;
7 n; b: ~, J% N1 Y! s import java.sql.PreparedStatement;
# F: U- c+ g8 k' L. U* H- ? import java.sql.ResultSet;* P. A' \ d9 d$ L5 K5 L+ q
import java.sql.SQLException;& Y* y; B7 G6 {5 y; G
import java.util.ArrayList;! w8 W5 [" k3 E, w9 |& v9 U& H; f+ c$ B! K
import java.util.List;4 Y7 w1 S, R- \# `% X# I
5 C3 ~1 g$ {; Z4 a# Y, j0 u3 F" S0 W
import s2.jsp.zhangxiao.dao.News;
* F% v$ {$ u S- t ; M0 n5 z9 U _6 p8 D
public class NewsDao extends NewsBase {
9 B% [- g; m5 V8 b# i private int count =2;
6 y. H' T H/ c z# Z5 q # |: C2 }$ \+ a0 g7 ^% A3 k
/**6 ]- o* E% V! [
* 查询总页数' }1 |7 ^# A( }' R7 d# s
* @return
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public int countPage(){
, t% W' U! @3 u; V" r4 Q- ?7 @ int rows=0;
" A" x- ]& E% l' R7 U3 @5 ` Connection con=null;+ U: _( Q% ?. Y$ }. d9 R
PreparedStatement past=null;2 P( m7 ]9 V# w9 `
ResultSet rs=null;
5 u/ a% _6 K7 y: g con=getConnection();7 K# Y9 k- k0 Q1 @2 \' U$ Z
//查询所有的的页数 返回受影响的行数
H6 x8 C' K7 ?* h String sql="select count(*)as c from news";
5 V5 I f: E/ V+ ], G9 R try {5 x# ]4 g+ X$ s1 m4 Q
past=con.prepareStatement(sql);
5 h; h+ X: J ^$ E0 D1 R rs=past.executeQuery();
* C$ `5 \" W) F, h. B# w+ I if(rs.next()){0 ~% s+ e- z3 k4 R. Q
//将所有的行数保存到rows 变量里
8 b! G: |* E! h0 I" |( q4 n rows=rs.getInt("c");
0 U- J G: Y, J8 Y //如果显示两页 count 代表显示的页数 + A/ N' M+ ?, c9 ?/ r3 I
if(rows%2==0){7 n: c$ a" e5 p( |: w
rows=rows/count;- x& M* j" {8 t; U, Q. A
& P) W6 X/ a: |( H6 x* j) ?% h* P) Q
}else{" A( j) Y( U3 b, M/ N; t V/ n
rows=rows/count+1;
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}- L. g& a' `: | {+ P& X1 c4 O
} catch (SQLException e) {! Q) C" L" j, l* S N/ c7 n% s
System.out.println("查询总页数方法异常");
; @9 ]( v5 f, I7 F: @6 Z% ~ e.printStackTrace();
1 s8 ]" b3 ~; c8 f: R* } }
* \' r0 U7 S$ R7 ^) w- ] return rows;
# p2 y& f7 z& K }" \* A2 F+ {1 e
/**4 Y* B! {' p& ^
* 根据id删除信息3 q9 n7 O8 S/ ?2 b; I; G
* @param id
' I1 g) g L! u5 [* B X * @return8 [9 L+ P" Z q7 x% F3 `9 z
*/: m @: ~. R( Y! u+ X
public int deleteNewsId(int id){
; z2 y' x, ]5 v3 r4 q8 f String sql="delete news where id="+id;
; Q( V3 i5 e% c- P return update(sql,null);
* W4 A% s( M7 E" G1 C. f9 ` }
4 P# @/ o y6 v! s x6 y0 w- V /**( A( k+ H( D2 l( I
* 根据总页数分页
* b* k# h% Q9 L * @param page" s1 H$ ~$ j) E5 x7 S
* @return/ K: y- Z h! [! y
*/
$ H8 v9 \* e4 V$ H public List getPageList(int page){
; h. u0 m) W7 M/ L7 U0 M Connection con=null;$ K; S0 f( a4 z8 I
PreparedStatement past=null;: e# n2 j( t) V8 Q3 j
ResultSet rs=null;
9 x% ^ F) w& S0 N ~4 I) J List list=new ArrayList();
! x* C! F. e+ e, R/ J2 C. V con=getConnection();
9 v; _% b: p1 L8 T0 x2 { //
" v: r/ ?/ m) Q: f* Y6 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";" O. |& Y* ~; T) ]. X7 A& m
try {5 `, U4 v. c% z2 i w
past=con.prepareStatement(sql);: o; |" g$ H% M4 h4 }
rs=past.executeQuery();- A/ {: f# {2 f: Y
while(rs.next()){' D% F' D) H! R% Y
/ Q4 K, Z4 v0 M$ n% ^/ f- ~
// id, title, content, pubtime, author V+ _' l5 O5 c9 M& {
int id=rs.getInt("id");
. \, e4 c0 z8 ~ p( r8 c5 W. Z: [ String title=rs.getString("title");- W1 j% L6 s% ]' z+ J3 c
String content=rs.getString("content");$ T; s6 ]6 f$ d3 y0 J! h
String pubtime=rs.getString("pubtime");$ z' c, g- s/ R( J: B+ C4 r2 w
String author=rs.getString("author");
$ \" L5 a5 K) m& { News news=new News(id, title,content,pubtime,author);
8 F: R- }7 `% }( c% P$ v/ r3 e list.add(news);
4 N1 f1 |" l7 u+ ~4 V8 ]; Y' J }* h8 B+ @5 M% c# I. m# b$ y$ M
} catch (SQLException e) { p3 N% y, e* Y7 d ~ \
// TODO Auto-generated catch block' _6 v3 |. I& Z% j0 {* M5 Y; ]! H
e.printStackTrace();! R( A. E( r% |" r/ l: M
}% F4 u% p8 Z* C3 S+ K9 U3 @: M
return list;
( v$ u7 y# g7 n" n
, V- ?6 a6 z4 l$ W }) o E7 U$ o" G* [% D
}
+ p8 _# W6 x6 a; u+ C% M) U1 V 复制代码 $ y7 t" O0 B, y! C3 A
+ e% s# u9 R0 N- B2 C0 J9 H
源代码以及数据库下载 :
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