add JDBCBEAN

.gitignore

@@ -0,0 +1,5 @@
+.classpath
+.project
+.metadata
+.settings
+build

WebContent/config/db.properties

@@ -1,4 +0,0 @@
-driver=com.mysql.jdbc.Driver
-url=jdbc:mysql://localhost:3306/library?useSSl=true&userUnicode=true&characterEncoding=utf-8
-username=root
-password=root

src/javabean/Base.java

@@ -13,7 +13,7 @@ import com.mysql.jdbc.PreparedStatement;
 public class Base {
 	
 	private static String driver = "com.mysql.jdbc.Driver";
-	private static String url = "jdbc:mysql://localhost:3306/library?useSSl=true&userUnicode=true&characterEncoding=utf-8";
+	private static String url = "jdbc:mysql://localhost:3306/library?useSSl=true&useUnicode=true&characterEncoding=utf-8";
 	private static String username = "root";
 	private static String password = "root";
 	
@@ -67,7 +67,7 @@ public class Base {
     	if(preparedStatement == null){
             preparedStatement = (PreparedStatement) connection.prepareStatement(sql);
         }
-        for(int i = 0; i < params.length; i++){
+        for(int i = 0; params != null && i < params.length; i++){
             preparedStatement.setObject(i+1, params[i]);
         }
         int updateRows = preparedStatement.executeUpdate();

src/javabean/JDBCBean.java

@@ -0,0 +1,55 @@
+package javabean;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.Statement;
+
+public class JDBCBean {
+	private static String driver = "com.mysql.jdbc.Driver";
+	private static String url = "jdbc:mysql://localhost:3306/library?useSSl=true&useUnicode=true&characterEncoding=utf-8";
+	private static String username = "root";
+	private static String password = "root";
+	private Connection conn = null;
+	private Statement stmt = null;
+	
+	public JDBCBean() {
+		try {
+			Class.forName(driver);
+			conn = DriverManager.getConnection(url, username, password);
+			stmt = conn.createStatement();
+			System.out.println("同数据库建立连接！");
+		} catch (Exception ex) {
+			System.out.println("无法同数据库建立连接！");
+		}
+	}
+
+	public int executeUpdate(String s) {
+		int result = 0;
+		try {
+			System.out.println(s + "------" + stmt + "-----");
+			result = stmt.executeUpdate(s);
+		} catch (Exception e) {
+			System.out.println("执行更新错误！");
+		}
+		return result;
+	}
+
+	public ResultSet executeQuery(String s) {
+		ResultSet rs = null;
+		try {
+			rs = stmt.executeQuery(s);
+		} catch (Exception e) {
+			System.out.println("执行查询错误！");
+		}
+		return rs;
+	}
+
+	public void close() {
+		try {
+			stmt.close();
+			conn.close();
+		} catch (Exception e) {
+			
+		}
+	}
+}