java连接sqlserver数据库并执行查询插入操作

好的，我可以为您提供 Java 连接 SQL Server 数据库并执行查询插入操作的代码范例。请确保您已经安装了 SQL Server，并且已经下载了相应的 SQL Server JDBC 驱动程序。以下是示例代码：

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class SQLServerExample {
    public static void main(String[] args) {
        // JDBC driver name and database URL
        String JDBC_DRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
        String DB_URL = "jdbc:sqlserver://localhost:1433;databaseName=mydatabase";

        // Database credentials
        String USER = "username";
        String PASS = "password";

        Connection conn = null;
        Statement stmt = null;
        try {
            // Register JDBC driver
            Class.forName(JDBC_DRIVER);

            // Open a connection
            System.out.println("Connecting to database...");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);

            // Execute a query
            System.out.println("Creating statement...");
            stmt = conn.createStatement();
            String sql;
            sql = "SELECT id, name, age FROM mytable";
            ResultSet rs = stmt.executeQuery(sql);

            // Extract data from result set
            while (rs.next()) {
                // Retrieve by column name
                int id = rs.getInt("id");
                String name = rs.getString("name");
                int age = rs.getInt("age");

                // Display values
                System.out.print("ID: " + id);
                System.out.print(", Name: " + name);
                System.out.println(", Age: " + age);
            }

            // Insert a record
            System.out.println("Inserting a record into the table...");
            sql = "INSERT INTO mytable (id, name, age) VALUES (4, 'John', 30)";
            int rowsInserted = stmt.executeUpdate(sql);
            if (rowsInserted > 0) {
                System.out.println("A new record has been inserted.");
            }

            // Clean-up environment
            rs.close();
            stmt.close();
            conn.close();
        } catch (SQLException se) {
            // Handle errors for JDBC
            se.printStackTrace();
        } catch (Exception e) {
            // Handle errors for Class.forName
            e.printStackTrace();
        } finally {
            // Finally block used to close resources
            try {
                if (stmt != null) {
                    stmt.close();
                }
            } catch (SQLException se2) {
            } // nothing we can do
            try {
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException se) {
                se.printStackTrace();
            } // end finally try
        } // end try
        System.out.println("Goodbye!");
    } // end main
}

在这个例子中，我们首先定义了数据库的 URL，用户名和密码。然后我们注册了 JDBC 驱动程序，打开了一个连接，并创建了一个 Statement 对象。接下来，我们执行了一个查询，并从结果集中提取了数据。最后，我们插入了一条记录，并关闭了连接。请注意，您需要将代码中的用户名、密码、数据库名、表名和列名更改为您自己的值。