帮我写一个go程序，满足一下要求1.校验两个数据库链接里的两个表2.数据条数不一致时候发邮件告警

好的，首先你需要安装Go语言和相关的库，比如`database/sql`用于操作数据库，`net/smtp`处理邮件发送。下面是一个简单的示例，这个程序假设你已经设置了数据库连接信息，并且有一个函数`sendEmail()`负责发送邮件。

package main

import (
	"database/sql"
	"fmt"
	"log"
	"net/smtp"
)

// 假设你有如下结构体来表示数据库表
type TableName struct {
	ID   int `db:"id"`
	Data string
}

func checkTableCounts(db1 *sql.DB, db2 *sql.DB, table1, table2 string) error {
	rows1, err := db1.Query("SELECT COUNT(*) FROM " + table1)
	if err != nil {
		return err
	}
	defer rows1.Close()

	rows2, err := db2.Query("SELECT COUNT(*) FROM " + table2)
	if err != nil {
		return err
	}
	defer rows2.Close()

	count1, _ := rows1.Next()
	count2, _ := rows2.Next()

	if count1 != count2 {
		errMessage := fmt.Sprintf("Table '%s' in database 1 has %d records, while '%s' in database 2 has %d records", table1, count1, table2, count2)
		log.Println(errMessage)

		// 发送邮件告警
		err = sendEmail("alarms@example.com", "Database Check Alert", "Error: "+errMessage)
		if err != nil {
			return err
		}
	}

	return nil
}

func sendEmail(to, subject, body string) error {
	from := "your-email@example.com" // 邮件发送者
	password := "your-password"      // 邮箱密码或授权码
	smtpHost := "smtp.example.com"    // SMTP服务器地址

 auth := smtp.PlainAuth("", from, password, smtpHost)
 message := []byte("To: " + to + "\r\n" +
	"MIME-Version: 1.0;\n"+
	"Content-Type: text/plain; charset=utf-8\r\n"+
	"\r\n"+
	body)

	err := smtp.SendMail(smtpHost+":587", auth, from, []string{to}, message)
	if err != nil {
		return err
	}
	fmt.Printf("Email sent successfully.\n")
	return nil
}

func main() {
	db1User, db1Pass, db1Host, db1DB := "user1", "pass1", "localhost:3306", "db1"
	db2User, db2Pass, db2Host, db2DB := "user2", "pass2", "localhost:3306", "db2"

	db1Str := fmt.Sprintf("mysql://%s:%s@%s/%s?charset=utf8", db1User, db1Pass, db1Host, db1DB)
	db2Str := fmt.Sprintf("mysql://%s:%s@%s/%s?charset=utf8", db2User, db2Pass, db2Host, db2DB)

	db1, err := sql.Open("mysql", db1Str)
	if err != nil {
		log.Fatal(err)
	}
	defer db1.Close()

	db2, err := sql.Open("mysql", db2Str)
	if err != nil {
		log.Fatal(err)
	}
	defer db2.Close()

	err = checkTableCounts(db1, db2, "table1", "table2") // 把实际的表名替换在这里
	if err != nil {
		log.Fatal(err)
	}
}