TA的每日心情 衰 2021-2-2 11:21
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package s2.jsp.zhangxiao.dao;$ c; _ D/ c5 b K
/**- ^4 ]2 H* x& L ~( I
* 实体类
2 g5 F: N* g5 A/ a- R * @author Administrator
5 C# V5 U& o$ T6 _ *
% }/ o* W* H# Y* u */
7 C1 |0 w& }' e) }) u# i public class News {5 Y# \0 `- f: `; {* v- c
// id, title, content, pubtime, author
5 q q/ m c" C private int id;1 }: O( N" d/ u0 D5 f8 w
private String title;0 p5 B( C8 t7 t/ W. j2 _3 ]+ L
private String content;3 U3 m( r% k/ g
private String pubtime;" o3 L" O% u4 s# |; J
private String author;
8 R( @6 |% }/ ^- A7 ` /**
1 n3 x9 G0 L M8 n2 d2 } * 构造函数
$ B5 D: D: Q8 h5 P$ u. d+ _ * @param author 作者
; n+ ]* w0 E& v) t1 l * @param content 内容% W8 ^1 N' A( E
* @param id 序号/ c7 i0 k) I4 v; y+ L! ?/ U' p
* @param pubtime 发布时间
# u" v ~' ]# u# y' h * @param title 标题! k9 Z b. b8 f- n% i; v9 N- b
*/: p# o. v M5 {* G
public News( int id,String title,String content, String pubtime,String author) {0 V( B, U. p5 S
) `3 I3 h; t8 j3 m% S# F this.author = author;
" s# v: g( {+ W" y this.content = content;6 s# r, |# J8 y+ b: ?
this.id = id;
7 A5 w+ x k" l; o3 q this.pubtime = pubtime;7 d u4 C% i" A- h1 E8 c% H0 m
this.title = title;- n. z+ n/ S* K1 @' Q" U* ]; T& \
}
$ F3 p3 A3 @2 n+ _/ D /**
( U2 c$ J. W/ r * 无参构造函数7 }; K3 F) r( g. n
*/
8 P* t3 W2 L& m4 p4 g8 L) d4 ? public News() {1 r$ l& K, Q0 U2 L% Y* D
super();
( m0 K0 ]. o& s6 h; z! S }
% R# N3 f3 V, s1 ]1 e /**
2 s- k4 u- E" ^ * get ,set
0 o! N) y/ b5 `" l, {9 E3 O, e( U * @return: Y% W" z7 x6 K' `* D$ X, z, Z
*/! |# o5 I3 I: f* `$ f6 V Q; p
public int getId() {
' g$ x3 L# E" ?* t6 Y' j return id;/ y( J g0 v* s
}
* W! M& E o; k% ^$ u6 A: d public void setId(int id) {3 ?2 E! z! t* O' w
this.id = id;
) u# [" F c# ?! \5 ^9 F( u$ c }' h* E1 I" H$ t7 K. O# P# |& n. e
public String getTitle() {
4 m6 k' M. D/ u3 Y0 T return title;+ c7 v" N( j3 F0 u& d
}/ ?. F8 p7 j, I& j
public void setTitle(String title) {% e+ Z6 }" l6 ]" q
this.title = title;) l$ X: ]) f4 w8 m, L
}
* D! H% x& j _) a$ I3 }% \ public String getContent() {9 j7 Z5 T" `3 l# Q+ u4 P3 D
return content;
' ]4 p8 b! A% `2 p# ^ }1 H5 a6 Q9 \& t5 Y9 b
public void setContent(String content) {
5 P- B8 K, B' K, _5 c% f this.content = content;
" x/ y4 C: h/ k6 k. F( ~* t }
; C' p1 ^$ h/ V public String getPubtime() {
9 ]% T( r; J2 l return pubtime;+ S. Q) y3 I4 g9 }/ h
}
8 ?: X8 N' @/ {% p1 Y+ j public void setPubtime(String pubtime) {
2 V+ { ]/ P; M, K* V. D3 X9 P# R* F this.pubtime = pubtime;
: S& w7 E9 {# ` }' r3 ^7 Y; |0 H7 |- O& E
public String getAuthor() {( U' d- i; Z* Q
return author;
, M6 |2 W7 A% X7 \7 M }% E7 E6 C5 m! h3 h. ]( O3 v
public void setAuthor(String author) {
! U4 S- B) d6 i* q% t, V' |- m this.author = author;4 ? @2 V! R, c) q( p
}
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复制代码 package s2.jsp.zhangxiao.entity;
' [* V. ]; w' \' f! c" ]0 I! v import java .sql.PreparedStatement;$ B; G" O2 {: {' Y
import java.sql.DriverManager;" k5 h! l! ~4 I' B5 \- P9 F+ S
import java.sql.Connection;1 m3 F- r/ U- b3 H M; p; V
import java.sql.ResultSet;5 O; a3 S1 M v+ C' i( m. O. A6 [) v
import java.sql.SQLException;/ e$ c8 ^7 g0 d' `1 I
_2 D* F# k1 p( l
import com.microsoft.sqlserver.jdbc.SQLServerDriver;
- @, X$ B0 ~2 x1 J
. ^" X8 o1 b- v) L public class NewsBase {' E6 j$ }8 e2 B
( h: m& y0 }" d6 {5 i" n
private static final String DRIVER="com.microsoft.sqlserver.jdbc.SQLServerDriver";
" v- y5 r( H, I) r( r, z private static final String URL="jdbc:sqlserver://localhost:1433;DataBaseName=news";0 H" t6 L0 o6 A' K1 @, h
private static final String DBNAME="sa";/ l, _0 v/ S% t& C
private static final String DBPASS="1234";
O0 O9 W( k o % c& H, i) R0 w; e3 H
public Connection getConnection(){
1 v; s+ \, S+ A) `, j Connection con=null;
0 O5 r1 K t+ p4 a$ ] try {
( g' |5 A0 _3 N. r* n+ r Class.forName(DRIVER);' N7 X2 {; i& G, h: x: S
con=DriverManager.getConnection(URL, DBNAME, DBPASS);" T/ q2 L* y) x" \1 F
} catch (ClassNotFoundException e) {1 y8 @+ z j+ \, y/ D8 k
System.out.println("加载驱动异常");
0 a- H/ h' C# E/ H! ]2 ] e.printStackTrace();
( U! g; `! {; G6 ]. |6 S } catch (SQLException e) {$ S4 ]" A6 |3 K& Y" Y5 ]1 V
System.out.println("数据库连接异常"); ?% l& s' ]1 F
e.printStackTrace();
$ i9 |2 {+ m. e- V! t }
6 G) n2 d6 m. N2 t/ Y+ L return con;
7 q) g2 G ^& ~6 \ }4 u+ j$ B$ ?" B4 R! Y
2 B" Q1 O! S1 q5 z: `" a- v& L4 y public void colseAll(Connection con,PreparedStatement past,ResultSet rs){
+ ]9 Z+ @3 F+ F5 ?9 A try {9 L9 g3 J6 [" f! a9 Q
rs.close();& j# ^8 q6 a2 q! E% A7 t+ u
} catch (SQLException e) {
1 D! s. ]) o: j, q. r System.out.println("");
/ ?1 C1 p+ K& |% i; u: Z' F# N1 U) T e.printStackTrace();! l1 Z; M+ D8 F, O1 M
}
% b8 g$ y! t! Z4 A: |0 \ try {1 m5 J- A) j$ y
past.close();! [6 l5 k) o) \* c0 \- x! R( ]
} catch (SQLException e) {' U c( g# p7 k
System.out.println("");% x' W5 V. X8 i) l' q8 p# ?' E7 U! p
e.printStackTrace();! x5 J2 v# S; Z1 b8 q
}
) d- N# D# U7 V0 C% ]+ A try {
7 o6 a& n% T. F( | con.close();: V+ {& h) E0 D. y. ]! E# V# |0 \
} catch (SQLException e) {$ n# s6 t" Z% x9 p. D
// TODO Auto-generated catch block
6 }* [( v0 v: A e.printStackTrace();& `7 [ i5 ^& m7 d
}% P; a: u. M( ]/ a! e u, Q& _
}$ w# z2 ]3 Y5 K: v% W6 L8 h( J+ u
! }7 V" b3 K1 v2 W
public int update(String sql,String[] getValues){
0 `) e: S) S; ]5 o; c int i=0;
1 o# B9 j0 O+ c9 ] Connection con=null;
I: K- u+ E! c6 x1 ^ PreparedStatement past=null;
0 q0 F2 F3 }" h6 o- ] con=getConnection();9 [5 t* w2 e& |& P' S6 T# n0 h* v8 P
try {
9 s. o) {7 x3 Z5 X past=con.prepareStatement(sql);
. ~( e( e T( }" h. Y. g0 p8 ? if(getValues!=null){1 d0 W* ~( l$ |; S" S
for (int j = 0; j < getValues.length; j++) {! g, f2 W) `! T9 a
past.setString(j+1, getValues[j]);
% |! B( J3 a; U# P* Y }" Y/ D! X1 a, Y3 [! O' t9 Q) `
}
. P! J' W! f7 n. @. c0 C2 O! c) g i=past.executeUpdate();3 {, \( a3 t. v% Y& l
} catch (SQLException e) {6 b m l& s6 m& V7 i& b7 {
// TODO Auto-generated catch block
1 @4 @! B, V* ^! g' V' T e.printStackTrace();
7 X' y B) D$ V3 b9 X( g3 d }" Q& v# f, ~* E# @
return i;' _2 H2 i- L" {/ y! z
}
" m) f( q' K6 e0 s' k4 z }. ?% ^5 j7 r5 e4 A2 |
复制代码 package s2.jsp.zhangxiao.entity;+ k; Q8 Z. O; @& I( d' z: w' N
& g) a; q2 S" X$ `, C& @
import java.sql.Connection;. c/ D7 F8 i; x3 F: U9 q1 w
import java.sql.PreparedStatement;) y1 ^0 x# s2 }
import java.sql.ResultSet;
* i* z1 t8 i/ n) _- o( x" Y1 ` import java.sql.SQLException;
5 m+ P0 ]+ }" \0 u e8 ^5 A1 L import java.util.ArrayList;
* ]/ l0 ^; K* c4 p0 a5 H; B9 g import java.util.List;
( E" {( A7 z% E1 ]8 } / R$ y: g4 w7 Z& C5 Z, r# h
import s2.jsp.zhangxiao.dao.News;
0 c) p# C& I; r% d* w8 u0 X& y ( a: }, W l. q* ]* p s8 b! i
public class NewsDao extends NewsBase {
c. D5 J, O. c* x private int count =2;
- g! z' n5 [" a$ k" }# \
6 K- @: {# I- E7 O% W+ q /**+ Z% g! _! k& O8 m
* 查询总页数
" I q# V N1 e- y- Z * @return# l' ?# f2 {+ f8 B
*/
0 M6 M" p) u# p2 h0 W3 z6 W; `- g public int countPage(){$ B& D9 ?# ]& u6 e' j
int rows=0;
4 @5 B4 m( V1 N% T, H- D2 b Connection con=null;+ j, G; p. ^1 }! X0 _
PreparedStatement past=null;
& W- v! @- \- l1 [% a/ {) D ResultSet rs=null;
! E @; h8 R) {/ L( M/ M" E0 O con=getConnection();0 q0 i' _& x0 r/ S- S
//查询所有的的页数 返回受影响的行数
7 M; F1 B& D3 \# F0 _ String sql="select count(*)as c from news";
! q, d7 {& T. r5 j! {1 f. ]' q8 {1 g try {; x9 q6 b6 L/ M2 Y: B& C; q
past=con.prepareStatement(sql);: ^ k4 ]( D( a6 m3 o) |# f
rs=past.executeQuery();
3 s5 n1 c7 N# Q4 N+ \% a7 x+ I6 m% s if(rs.next()){
# |9 x* J! w7 C //将所有的行数保存到rows 变量里
1 l4 V5 S0 d5 Z! s6 T rows=rs.getInt("c");
c' X9 p3 T- \& R* C1 y2 N8 ^! w //如果显示两页 count 代表显示的页数 ( b, S& D: W- E0 O$ \0 c. _" s
if(rows%2==0){
1 L5 n- M! X( V" b* q9 ?9 N6 z+ M rows=rows/count;
( y; Q1 Q2 g. y; s } . j7 w+ w# ?/ _4 x8 f: ^+ B& u+ E( L& T
}else{6 t0 ?+ c c( e' ~5 Y6 H
rows=rows/count+1;
0 }' e' X4 V. d: I } `% C% f# y* U7 z: g7 N: W
}
; ^, p7 W5 Q- f7 r4 e1 M- l& _ } catch (SQLException e) {
# X- g9 e; w! q: h! v8 r' T System.out.println("查询总页数方法异常");! T% u3 C2 }" }
e.printStackTrace();
6 [% [0 q Z. {5 T }
2 p L& |* F/ e C B, c* r4 q return rows;
0 t5 ]" u8 g" q5 V. }3 f( r5 G0 { }* p( A# t2 S8 y% X
/**
( [/ g# X+ l( _0 p; V * 根据id删除信息, P* Q' V9 j3 Y2 \
* @param id
3 d) P% K0 u" G) {; q. [5 k * @return6 ~5 y+ L% Y5 |- k$ ^
*/
) e# |% w" M3 `$ [: L- O" x public int deleteNewsId(int id){
, f: _$ P, V- V8 c# A) A# P3 W2 C% P% z String sql="delete news where id="+id;
0 |2 e ~2 P$ O8 E. \8 r) S# @/ s return update(sql,null);5 s" G, v U* }
}
* Q/ n! e' B1 O& V /**
5 |/ S' A# ?" S, n * 根据总页数分页
" _/ Q/ H. P# y3 G# P# o1 J * @param page
5 T& o# r! r9 N4 ? * @return+ R9 s" s- x! F g( r
*/6 ?% D# | N! h% u @( y
public List getPageList(int page){. G m- Q8 U# ]
Connection con=null;
1 f. v" Y! T1 v8 v8 z7 } PreparedStatement past=null;% w! v4 O3 } }( [ Y
ResultSet rs=null;) m# B7 h- m; e- V
List list=new ArrayList();
8 A. s1 c* H7 {: K! Y con=getConnection();* @2 m' [) @" n7 d5 y/ e5 F
// j8 e, @2 L) Q0 U* Q8 V2 }
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";) V* L3 l7 ?- W4 b' t: _) p; a$ Z; G
try { i6 s. H& d5 z+ `) y" y* ?
past=con.prepareStatement(sql);
" y. j0 V2 }/ a: X% B5 S rs=past.executeQuery();0 t; x2 E: R- |, }
while(rs.next()){8 h1 _0 L* B( z" \' ], w
% k# Z" ^% A( [4 `& l* I4 H
// id, title, content, pubtime, author6 s0 a, s9 }" @& V
int id=rs.getInt("id");* J p0 y" [, m
String title=rs.getString("title");
/ {, C* @) W- ^, h String content=rs.getString("content");
/ _& P- ?, I/ e String pubtime=rs.getString("pubtime");
6 a- m+ A$ o0 ^8 D) A' X6 K String author=rs.getString("author");
& ~6 O& H# z" f$ D; P: ^6 E News news=new News(id, title,content,pubtime,author);
4 `7 C) M) k' D8 z) n1 m/ v list.add(news);
% ] r' s, c6 |; a/ ^ }7 h* A' c1 L$ i
} catch (SQLException e) {
. |4 p$ U- z) J% W6 j* ` // TODO Auto-generated catch block8 f; g1 y; |3 ]3 U! ]
e.printStackTrace();
6 l' F9 R$ H/ D3 @+ y/ f$ ]1 P4 D }
+ H# L& V: N1 A. K return list;
0 H$ Y: P/ n6 X. l; Y% k/ C
- G2 Y# f* u5 J, {0 V" a x1 R1 T! ]( x }
$ X/ c1 s; s! F }! D6 v7 M, Y7 w& g% F' B
复制代码
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3 ]# S# w) Z7 Z1 S7 R! n; H+ b 源代码以及数据库下载 :
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