diff --git a/testJDBC/JDBCDemo1/src/com/msb/test2/TestInjection2.java b/testJDBC/JDBCDemo1/src/com/msb/test2/TestInjection2.java
new file mode 100644
index 0000000..1e99b71
--- /dev/null
+++ b/testJDBC/JDBCDemo1/src/com/msb/test2/TestInjection2.java
@@ -0,0 +1,78 @@
+package com.msb.test2;
+
+import com.msb.bean.Account;
+
+import java.sql.*;
+import java.util.Scanner;
+
+public class TestInjection2 {
+    public static String driver = "com.mysql.cj.jdbc.Driver";
+    public static String url = "jdbc:mysql://127.0.0.1:3306/mydb?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai";
+    public static String user = "root";
+    public static String password = "Fnst1234";
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("请输入用户名");
+        String username = scanner.next();
+        System.out.println("请输入密码");
+        String pwd = scanner.next();
+
+        Account account = queryAccount(username, pwd);
+        System.out.println(account != null ? "登录成功" : "登录失败");
+        scanner.close();
+    }
+
+    public static Account queryAccount(String userName, String pwd) {
+        Account result = null;
+
+        Connection connection = null;
+        PreparedStatement statement = null;
+        ResultSet resultSet = null;
+
+        try {
+            // 选择数据库
+//        Driver driver = new com.mysql.cj.jdbc.Driver();
+//        DriverManager.registerDriver(driver);
+            Class.forName(driver);
+
+            // 建立连接
+            connection = DriverManager.getConnection(url, user, password);
+
+            // 执行sql
+            String sql = "select * from account where username = ? and password = ?";
+            statement = connection.prepareStatement(sql);
+            statement.setString(1, userName);
+            statement.setString(2, pwd);
+            resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                int aid = resultSet.getInt("aid");
+                String usernamea = resultSet.getString("username");
+                String pwda = resultSet.getString("password");
+                double money = resultSet.getDouble("money");
+                result = new Account(aid,usernamea,pwda,money);
+            }
+        }
+        catch (Exception e) {
+            e.printStackTrace();
+        }
+        finally {
+            try {
+                if (resultSet != null) {
+                    resultSet.close();
+                }
+                if (statement != null) {
+                    statement.close();
+                }
+                if (connection != null) {
+                    connection.close();
+                }
+            }
+            catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+
+        return result;
+    }
+}
diff --git a/testJDBC/JDBCDemo1/src/com/msb/test3/TestPreparedStatement.java b/testJDBC/JDBCDemo1/src/com/msb/test3/TestPreparedStatement.java
new file mode 100644
index 0000000..975f1cc
--- /dev/null
+++ b/testJDBC/JDBCDemo1/src/com/msb/test3/TestPreparedStatement.java
@@ -0,0 +1,128 @@
+package com.msb.test3;
+
+import com.msb.bean.Account;
+
+import java.sql.*;
+
+public class TestPreparedStatement {
+    public static String driver = "com.mysql.cj.jdbc.Driver";
+    public static String url = "jdbc:mysql://127.0.0.1:3306/mydb?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai";
+    public static String user = "root";
+    public static String password = "Fnst1234";
+
+    public static void main(String[] args) {
+//        testAdd();
+//        testUpdate();
+        testDelete();
+    }
+
+    public static void testAdd() {
+        Connection connection = null;
+        PreparedStatement statement = null;
+
+        try {
+            // 选择数据库
+            Class.forName(driver);
+
+            // 建立连接
+            connection = DriverManager.getConnection(url, user, password);
+
+            // 执行sql
+            String sql = "insert into account values (DEFAULT,?,?,?)";
+            statement = connection.prepareStatement(sql);
+            statement.setString(1, "dingyl");
+            statement.setString(2, "123456");
+            statement.setDouble(3, 10000000);
+            int rows = statement.executeUpdate();
+            System.out.println("影响行数据:" + rows);
+        }
+        catch (Exception e) {
+            e.printStackTrace();
+        }
+        finally {
+            try {
+                if (statement != null) {
+                    statement.close();
+                }
+                if (connection != null) {
+                    connection.close();
+                }
+            }
+            catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    public static void testUpdate() {
+        Connection connection = null;
+        PreparedStatement statement = null;
+
+        try {
+            // 选择数据库
+            Class.forName(driver);
+
+            // 建立连接
+            connection = DriverManager.getConnection(url, user, password);
+
+            // 执行sql
+            String sql = "update account set password = ? where aid = 3";
+            statement = connection.prepareStatement(sql);
+            statement.setString(1, "654321");
+            int rows = statement.executeUpdate();
+            System.out.println("影响行数据:" + rows);
+        }
+        catch (Exception e) {
+            e.printStackTrace();
+        }
+        finally {
+            try {
+                if (statement != null) {
+                    statement.close();
+                }
+                if (connection != null) {
+                    connection.close();
+                }
+            }
+            catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    public static void testDelete() {
+        Connection connection = null;
+        PreparedStatement statement = null;
+
+        try {
+            // 选择数据库
+            Class.forName(driver);
+
+            // 建立连接
+            connection = DriverManager.getConnection(url, user, password);
+
+            // 执行sql
+            String sql = "delete from account where aid = ?";
+            statement = connection.prepareStatement(sql);
+            statement.setInt(1, 3);
+            int rows = statement.executeUpdate();
+            System.out.println("影响行数据:" + rows);
+        }
+        catch (Exception e) {
+            e.printStackTrace();
+        }
+        finally {
+            try {
+                if (statement != null) {
+                    statement.close();
+                }
+                if (connection != null) {
+                    connection.close();
+                }
+            }
+            catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}
diff --git a/testJDBC/JDBCDemo1/src/com/msb/test4/TestBatch.java b/testJDBC/JDBCDemo1/src/com/msb/test4/TestBatch.java
new file mode 100644
index 0000000..1a0659c
--- /dev/null
+++ b/testJDBC/JDBCDemo1/src/com/msb/test4/TestBatch.java
@@ -0,0 +1,62 @@
+package com.msb.test4;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+
+public class TestBatch {
+    public static String driver = "com.mysql.cj.jdbc.Driver";
+    public static String url = "jdbc:mysql://127.0.0.1:3306/mydb?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&useServerPrepStmts=true&cachePrepStmts=true&&rewriteBatchedStatements=true";
+    public static String user = "root";
+    public static String password = "Fnst1234";
+
+    public static void main(String[] args) {
+        testAddBatch();
+    }
+
+    public static void testAddBatch() {
+        Connection connection = null;
+        PreparedStatement statement = null;
+
+        try {
+            // 选择数据库
+            Class.forName(driver);
+
+            // 建立连接
+            connection = DriverManager.getConnection(url, user, password);
+
+            // 执行sql
+            String sql = "insert into account values (DEFAULT,?,?,?)";
+            statement = connection.prepareStatement(sql);
+            int rows = 0;
+            for (int i = 1; i <= 10000; i++) {
+                statement.setString(1, "name");
+                statement.setString(2, "pwd");
+                statement.setDouble(3, 1000);
+                statement.addBatch();
+                if (i % 100 == 0) {
+                    int[] ss = statement.executeBatch();
+                    rows += ss.length;
+                }
+            }
+            System.out.println("影响行数据:" + rows);
+        }
+        catch (Exception e) {
+            e.printStackTrace();
+        }
+        finally {
+            try {
+                if (statement != null) {
+                    statement.close();
+                }
+                if (connection != null) {
+                    connection.close();
+                }
+            }
+            catch (SQLException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}