From fd6c9b7c93f268e4c908e671d25d34df4b0c6b84 Mon Sep 17 00:00:00 2001
From: zhai_lw <zhai_lw@outlook.com>
Date: Wed, 9 Jan 2019 09:59:34 +0800
Subject: [PATCH] =?UTF-8?q?1,=20=E8=AE=BE=E7=BD=AEtomcat=E6=9C=8D=E5=8A=A1?=
=?UTF-8?q?=E5=99=A8=202=EF=BC=8C=E9=85=8D=E7=BD=AE=E6=95=B0=E6=8D=AE?=
=?UTF-8?q?=E5=BA=93=E8=BF=9E=E6=8E=A5=E6=B1=A0=203=EF=BC=8C=E5=A2=9E?=
=?UTF-8?q?=E5=8A=A0=E4=B8=80=E7=B1=BBLastProcess=204=EF=BC=8C=E8=B0=83?=
=?UTF-8?q?=E6=95=B4=E7=9B=AE=E5=BD=95=E7=BB=93=E6=9E=84=205=EF=BC=8C?=
=?UTF-8?q?=E5=85=B6=E4=BB=96?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
---
GDMS.iml | 1 -
src/dao/DBManagement.java | 57 +++++++++++++++++++++++++++++++++------
src/init/Init.java | 2 +-
3 files changed, 50 insertions(+), 10 deletions(-)
diff --git a/GDMS.iml b/GDMS.iml
index 4bde68d..4c713fc 100644
--- a/GDMS.iml
+++ b/GDMS.iml
@@ -29,6 +29,5 @@
<SOURCES />
</library>
</orderEntry>
- <orderEntry type="library" scope="PROVIDED" name="mariadb-java-client-2.3.0" level="project" />
</component>
</module>
\ No newline at end of file
diff --git a/src/dao/DBManagement.java b/src/dao/DBManagement.java
index e597616..d8718a4 100644
--- a/src/dao/DBManagement.java
+++ b/src/dao/DBManagement.java
@@ -1,10 +1,6 @@
package dao;
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-import java.sql.Statement;
-import java.util.Properties;
+import java.sql.*;
import org.apache.tomcat.jdbc.pool.DataSource;
import org.apache.tomcat.jdbc.pool.PoolProperties;
@@ -19,20 +15,24 @@ public class DBManagement {
public static DataSource dataSource = new DataSource();
- public void init(){
+ private static boolean ifInit = false;
+
+ public static void init(){
PoolProperties poolProperties = new PoolProperties();
poolProperties.setUrl(url);
poolProperties.setDriverClassName(driverClassName);
poolProperties.setUsername(username);
poolProperties.setPassword(password);
dataSource.setPoolProperties(poolProperties);
- }
- public static Connection getConnection(){
try {
Class.forName(driverClassName);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
+ ifInit = true;
+ }
+ public static Connection getConnection(){
+ if(!ifInit) return null;
try {
return DriverManager.getConnection(url,username,password);
} catch (SQLException e) {
@@ -40,4 +40,45 @@ public class DBManagement {
}
return null;
}
+
+ public static ResultSet query(String sql) {
+ if(!ifInit) return null;
+ ResultSet rs = null;
+ Connection con = null;
+ try{
+ con = DBManagement.getConnection();
+ Statement stmt = con.createStatement();
+ rs = stmt.executeQuery(sql);
+ } catch (SQLException e) {
+ e.printStackTrace();
+ }finally {
+ if(con!=null) {
+ try {
+ con.close();
+ } catch (SQLException e) {
+ e.printStackTrace();
+ }
+ }
+ }
+ return rs;
+ }
+ public static void update(String sql) {
+ if(!ifInit) return;
+ Connection con = null;
+ try{
+ con = DBManagement.getConnection();
+ Statement stmt = con.createStatement();
+ stmt.executeUpdate(sql);
+ } catch (SQLException e) {
+ e.printStackTrace();
+ }finally {
+ if(con!=null) {
+ try {
+ con.close();
+ } catch (SQLException e) {
+ e.printStackTrace();
+ }
+ }
+ }
+ }
}
diff --git a/src/init/Init.java b/src/init/Init.java
index dfc60d4..3d42bad 100644
--- a/src/init/Init.java
+++ b/src/init/Init.java
@@ -13,7 +13,7 @@ import java.io.IOException;
@WebServlet(name = "Init")
public class Init extends HttpServlet {
public void init(){
- new DBManagement().init();
+ DBManagement.init();
new test();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {