feat(*): 更新第十四周

src/chapter14/DBOperate1.java

@@ -0,0 +1,58 @@
+package chapter14;
+
+import java.sql.*;
+
+/**
+ * description:
+ * author: Leslie Leung
+ * date: 2020/12/7
+ */
+public class DBOperate1 {
+    public static void main(String[] args) throws SQLException {
+        Connection connection = null;
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+            connection = DriverManager.getConnection("jdbc:mysql://localhost:3307/STUDENTDB2?characterEncoding=utf8&useSSL=false&serverTimezone=Hongkong", "root", "password");
+
+            String sql = "select NO,NAME,AGE,CLASS from students where name like ? and age=?";
+
+            PreparedStatement stmt = connection.prepareStatement(sql);
+            stmt.setObject(1, "小%");
+            stmt.setObject(2,23);
+            ResultSet rs = stmt.executeQuery();
+            while (rs.next())
+            {
+                System.out.print(rs.getString(1)+"\t");
+                System.out.print(rs.getString(2)+"\t");
+                System.out.print(rs.getInt(3)+"\t");
+                System.out.print(rs.getString(4)+"\n");
+            }
+            System.out.println("------------------------------------");
+
+            String sql1 = "insert into STUDENTS(NO,NAME,AGE,CLASS) values(?,?,?,?)";
+            stmt = connection.prepareStatement(sql1);
+            stmt.setObject(1,"2018100xxxx");
+            stmt.setObject(2,"xxx");
+            stmt.setObject(3, 21);
+            stmt.setObject(4,"软件工程1801");
+
+            stmt.executeUpdate();
+            sql = "select NO,NAME,AGE,CLASS from STUDENTS ";
+            stmt = connection.prepareStatement(sql);
+            rs = stmt.executeQuery();
+
+            while (rs.next())
+            {
+                System.out.print(rs.getString(1)+"\t");
+                System.out.print(rs.getString(2)+"\t");
+                System.out.print(rs.getInt(3)+"\t");
+                System.out.print(rs.getString(4)+"\n");
+            }
+
+        } catch (Exception e) {
+            e.printStackTrace();
+        } finally {
+            connection.close();
+        }
+    }
+}