qrz03

pom.xml

@@ -34,6 +34,15 @@
       <artifactId>mysql-connector-java</artifactId>
       <version>5.1.47</version>
     </dependency>
+
+    <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
+    <dependency>
+      <groupId>com.alibaba</groupId>
+      <artifactId>druid</artifactId>
+      <version>1.2.6</version>
+    </dependency>
+
+
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter-api</artifactId>

src/main/java/com/sf/T.java

@@ -0,0 +1,10 @@
+package com.sf;
+
+
+
+public class T {
+
+
+
+
+}

src/main/java/com/sf/day03/T.java

@@ -0,0 +1,12 @@
+package com.sf.day03;
+
+import org.junit.Test;
+
+public class T {
+
+    //创建单元测试
+    @Test
+    public void t1(){
+        System.out.println("Hello");
+    }
+}

src/main/java/com/sf/quanrizhi/day03/TE.java

@@ -0,0 +1,135 @@
+package com.sf.quanrizhi.day03;
+
+import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.druid.pool.DruidDataSourceFactory;
+import com.alibaba.druid.pool.DruidPooledConnection;
+import org.junit.Test;
+
+import javax.sql.DataSource;
+import java.io.IOException;
+import java.io.InputStream;
+import java.sql.*;
+import java.util.Comparator;
+import java.util.Properties;
+
+public class TE {
+
+    /**
+     * PreparedStatement
+     */
+    @Test
+    public void t1() throws ClassNotFoundException, SQLException {
+    //  加载数据库的驱动
+        Class.forName("com.mysql.jdbc.Driver");
+        //创建数据库的连接
+        Connection connection = DriverManager.getConnection("jdbc:mysql:///jdbc?characterEncoding=utf-8", "root", "root");
+        //创建PreparedStatement对象
+        String  sql = "insert into user(user_name,price,create_time) values (?,?,?)";
+        PreparedStatement preparedStatement = connection.prepareStatement(sql);
+        //⑤绑定参数(参数的下标从1开始而不是像数组或者集合从0开始)
+        preparedStatement.setDouble(2,123.12);
+        preparedStatement.setString(1,"lisa");
+        preparedStatement.setDate(3,new Date(System.currentTimeMillis()));
+        int row = preparedStatement.executeUpdate();
+        System.out.println(row);
+    }
+
+
+    /**
+     * 张三给李四转账500元
+     */
+
+    @Test
+    public void t2(){
+        Connection connection = null;
+        //加载驱动
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+             connection = DriverManager.getConnection("jdbc:mysql:///jdbc?characterEncoding=utf-8", "root", "root");
+            //取消默认提交方式
+            connection.setAutoCommit(false);
+            Statement statement = connection.createStatement();
+            String sql1 = "UPDATE account SET money = money+500 WHERE account_name='z3'";
+            String sql2 = "UPDATE account SET money = money-500 WHERE account_name='l4'";
+            statement.executeUpdate(sql1);
+            //  演示存在异常
+//            int a = 1/0;
+            statement.executeUpdate(sql2);
+            //手动提交
+            connection.commit();
+        } catch (ClassNotFoundException | SQLException e) {
+            if (connection != null) {
+                try {
+                    connection.rollback();
+                } catch (SQLException ex) {
+                    throw new RuntimeException(ex);
+                }
+            }
+        }
+
+    }
+
+    @Test
+    public void t3() throws ClassNotFoundException,SQLException{
+        //执行批量处理
+        Class.forName("com.mysql.jdbc.Driver");
+       Connection connection = DriverManager.getConnection("jdbc:mysql:///jdbc?characterEncoding=utf-8", "root", "root");
+        //取消默认提交方式
+        connection.setAutoCommit(false);
+        Statement statement = connection.createStatement();
+        String sql1 = "UPDATE account SET money = money+500 WHERE account_name='z3'";
+        String sql2 = "UPDATE account SET money = money-500 WHERE account_name='l4'";
+        statement.addBatch(sql1);
+        statement.addBatch(sql2);
+        // 批量执行
+        statement.executeBatch();
+        connection.commit();
+    }
+
+    @Test
+    public void t4() throws SQLException {
+        //创建Druid的核心连接池对象DruidDataSource
+        DruidDataSource ds = new DruidDataSource();
+        //设置初始化参数
+        ds.setUrl("jdbc:mysql:///jdbc?characterEncoding=utf-8");
+        ds.setUsername("root");
+        ds.setPassword("root");
+        ds.setDriverClassName("com.mysql.jdbc.Driver");
+        //  获取数据库的连接
+        Connection connection = ds.getConnection();
+        //预编译
+        String sql = "INSERT INTO user(user_name,price,create_time) VALUES(?,?,?)";
+        PreparedStatement preparedStatement = connection.prepareStatement(sql);
+        //  动态绑定参数信息
+        preparedStatement.setString(1,"litiantian");
+        preparedStatement.setDouble(2,12.23);
+        preparedStatement.setDate(3,new Date(System.currentTimeMillis()));
+        int row = preparedStatement.executeUpdate();
+        System.out.println(row);
+
+    }
+
+    /**
+     * 通过获取文件信息的方式
+     */
+    @Test
+    public void t5() throws Exception {
+        InputStream inputStream = TE.class.getClassLoader().getResourceAsStream("db.properties");
+        Properties properties = new Properties();
+        properties.load(inputStream);
+//采用Druid提供的工厂类创建DruidDataSource对象
+        DataSource dataSource = DruidDataSourceFactory.createDataSource(properties);
+        //  获取数据库的连接
+        Connection connection = dataSource.getConnection();
+        String sql = "INSERT INTO user(user_name,price,create_time) VALUES(?,?,?)";
+        PreparedStatement preparedStatement = connection.prepareStatement(sql);
+        //  动态赋值
+        preparedStatement.setString(1,"llovecoding");
+        preparedStatement.setDouble(2,12.23);
+        preparedStatement.setDate(3,new Date(System.currentTimeMillis()));
+        int i = preparedStatement.executeUpdate();
+        System.out.println(i);
+    }
+
+
+}

src/main/resources/db.properties

@@ -0,0 +1,4 @@
+url=jdbc:mysql:///jdbc?characterEncoding=utf-8
+username=root
+password=root
+driverClassName=com.mysql.jdbc.Driver

target/classes/db.properties

@@ -0,0 +1,4 @@
+url=jdbc:mysql:///jdbc?characterEncoding=utf-8
+username=root
+password=root
+driverClassName=com.mysql.jdbc.Driver