Go语言入门心法(十):Go语言操作MYSQL(CRUD)

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Go语言入门心法(一): 基础语法

Go语言入门心法(二): 结构体

Go语言入门心法(三): 接口

Go语言入门心法(四): 异常体系

Go语言入门心法(五): 函数

Go语言入门心法(六): HTTP面向客户端|服务端编程

Go语言入门心法(八): mysql驱动安装报错onnection failed

Go语言入门心法(九): 引入三方依赖

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一: go连接mysql数据库

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package main

import (
	"database/sql"
	"fmt"
	"log"
	// 注册驱动器 _下划线表示执行驱动中的init函数,不使用其他函数
	_ "github.com/go-sql-driver/mysql"
)

/*
go语言连接mysql数据库操作：
*/
func main() {
	db, err := sql.Open("mysql", "root:123456@tcp(127.0.0.1:3306)/tope-pay-user")
	if err != nil {
		fmt.Println("数据库连接异常: ", err)
	}

	// 延迟执行Closer()函数
	defer db.Close()

	// 验证连接的可用性
	err = db.Ping()
	if err != nil {
		log.Fatal("数据库连接失败:", err)
	}
	log.Println("数据库连接成功: ", db.Stats())
}

---

运行效果：

---

GOROOT=D:\program_file_worker\go1.20 #gosetup

GOPATH=D:\program_file_worker\go1.20\bin;C:\Users\Administrator\go #gosetup

D:\program_file_worker\go1.20\bin\go.exe build -o C:\Users\Administrator\AppData\Local\Temp\GoLand\___go_build_OOPMysqlToDatabaseLinkGrammar_go.exe D:\program_file\go_workspace\org.jd.data\database\OOPMysqlToDatabaseLinkGrammar.go #gosetup

C:\Users\Administrator\AppData\Local\Temp\GoLand\___go_build_OOPMysqlToDatabaseLinkGrammar_go.exe

2023/10/18 18:55:22 数据库连接成功: {0 1 0 1 0 0s 0 0 0}

Process finished with the exit code 0

二: go连接mysql创建表

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package main

/*
创建表:
*/

import (
	"database/sql"
	"fmt"
	// 注册驱动器 _下划线表示执行驱动中的init函数,不使用其他函数
	_ "github.com/go-sql-driver/mysql"
	"log"
)

func main() {
	db, err := sql.Open("mysql", "root:123456@tcp(127.0.0.1:3306)/tope-pay-user")
	if err != nil {
		log.Fatal(err)
		fmt.Println("数据库连接异常: ", err)
	}

	// 延迟执行Closer()函数
	defer db.Close()

	// 验证连接的可用性
	err = db.Ping()
	if err != nil {
		log.Fatal("数据库连接失败:", err)
	}

	// 创建一张表
	createTable :=
		"CREATE TABLE `sys_go_dept` (" +
			"`deptid` bigint(11) NOT NULL AUTO_INCREMENT COMMENT '主键'," +
			"`deptno` bigint(11) NOT NULL COMMENT '编码编号'," +
			"`dname` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT '' COMMENT '部门名称'," +
			"`location` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '地点'," +
			"PRIMARY KEY (`deptid`)" +
			") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;"

	println(createTable)
	_, err = db.Exec(createTable)
	if err != nil {
		log.Fatal("创建表失败:", err)
	}
	log.Println("数据表创建成功")

}

---

运行效果：

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GOROOT=D:\program_file_worker\go1.20 #gosetup

GOPATH=D:\program_file_worker\go1.20\bin;C:\Users\Administrator\go #gosetup

D:\program_file_worker\go1.20\bin\go.exe build -o C:\Users\Administrator\AppData\Local\Temp\GoLand\___go_build_org_jd_data_org_jd_data_database.exe D:\program_file\go_workspace\org.jd.data\database\OOPMysqlToDatabaseCreateTableGrammar.go #gosetup

C:\Users\Administrator\AppData\Local\Temp\GoLand\___go_build_org_jd_data_org_jd_data_database.exe

CREATE TABLE `sys_go_dept` (`deptid` bigint(11) NOT NULL AUTO_INCREMENT COMMENT '主键',`deptno` bigint(11) NOT NULL COMMENT '编码编号',`dname` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT '' COMMENT '部ocation` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '地点',PRIMARY KEY (`deptid`)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

2023/10/18 18:52:40 数据表创建成功

Process finished with the exit code 0

三: go插入数据

---

package main

import (
	"database/sql"
	// 注册驱动器 _下划线表示执行驱动中的init函数,不使用其他函数
	_ "github.com/go-sql-driver/mysql"
	"log"
)

func main() {
	db, err := sql.Open("mysql", "root:123456@tcp(127.0.0.1:3306)/tope-pay-user")
	checkErr(err)

	// 延迟执行Closer()函数
	defer db.Close()

	// 验证连接的可用性
	err = db.Ping()
	checkErr(err)

	log.Println("数据库连接成功! ")

	insertSql := "insert into `sys_go_dept` (deptno,dname,location)values (?,?,?) "
	rs, err := db.Exec(insertSql, 100000011, "销售总监", "北京市海淀区马连洼街道200号")
	checkErr(err)

	rowCount, err := rs.RowsAffected()
	checkErr(err)
	log.Printf("插入 %d 条数据", rowCount)
}

func checkErr(err error) {
	if err != nil {
		log.Fatal("系统异常: ", err.Error())
	}
}

---

运行效果：

---

GOROOT=D:\program_file_worker\go1.20 #gosetup

GOPATH=D:\program_file_worker\go1.20\bin;C:\Users\Administrator\go #gosetup

D:\program_file_worker\go1.20\bin\go.exe build -o C:\Users\Administrator\AppData\Local\Temp\GoLand\__go_build_org_jd_data_org_jd_data_database__1.exe D:\program_file\go_workspace\org.jd.data\database\OOPMysqlToDatabaseInsertGrammar.go #gosetup

C:\Users\Administrator\AppData\Local\Temp\GoLand\__go_build_org_jd_data_org_jd_data_database__1.exe

2023/10/18 19:47:03 数据库连接成功!

2023/10/18 19:47:03 插入 1 条数据

Process finished with the exit code 0

四: go修改数据

---

package main

import (
	"database/sql"
	// 注册驱动器 _下划线表示执行驱动中的init函数,不使用其他函数
	_ "github.com/go-sql-driver/mysql"
	"log"
)

func main() {
	db, err := sql.Open("mysql", "root:123456@tcp(127.0.0.1:3306)/tope-pay-user")
	updateCheckErr(err)

	// 延迟执行Closer()函数
	defer db.Close()

	// 验证连接的可用性
	err = db.Ping()
	updateCheckErr(err)

	log.Println("数据库连接成功! ")

	updateSql := "update `sys_go_dept` set dname=? , location=? where deptno =? "
	rs, err := db.Exec(updateSql, "CFO(首席财务官)", "北京市朝阳区三里屯大街2000号", 100000011)
	updateCheckErr(err)

	rowCount, err := rs.RowsAffected()
	updateCheckErr(err)

	if rowCount > 0 {
		log.Println("更新成功")
	}

}

func updateCheckErr(err error) {
	if err != nil {
		log.Fatal("系统异常: ", err.Error())
	}
}

---

运行效果：

---

GOROOT=D:\program_file_worker\go1.20 #gosetup

GOPATH=D:\program_file_worker\go1.20\bin;C:\Users\Administrator\go #gosetup

D:\program_file_worker\go1.20\bin\go.exe build -o C:\Users\Administrator\AppData\Local\Temp\GoLand\__go_build_org_jd_data_org_jd_data_database__2.exe D:\program_file\go_workspace\org.jd.data\database\OOPMysqlToDatabaseQueryGrammar.go #gosetup

C:\Users\Administrator\AppData\Local\Temp\GoLand\__go_build_org_jd_data_org_jd_data_database__2.exe

2023/10/18 20:31:26 数据库连接成功!

2023/10/18 20:31:27 更新成功

Process finished with the exit code 0

五: go查询数据

---

package main

import (
	"database/sql"
	// 注册驱动器 _下划线表示执行驱动中的init函数,不使用其他函数
	_ "github.com/go-sql-driver/mysql"
	"log"
)

func main() {
	db, err := sql.Open("mysql", "root:123456@tcp(127.0.0.1:3306)/tope-pay-user")
	queryCheckErr(err)

	// 延迟执行Closer()函数
	defer db.Close()

	// 验证连接的可用性
	err = db.Ping()
	queryCheckErr(err)

	log.Println("数据库连接成功! ")
	querySql := "select * from sys_go_dept where deptno = ?"

	rows, err := db.Query(querySql, 100000011)

	// 延迟执行
	defer rows.Close()

	for rows.Next() {
		user := User{}
		// 顺序需与数据库表的字段对应
		err := rows.Scan(&user.deptid, &user.deptno, &user.dname, &user.location)
		queryCheckErr(err)
		log.Println(user)
	}

}

type User struct {
	deptid   int64
	deptno   int64
	dname    string
	location string
}

func queryCheckErr(err error) {
	if err != nil {
		log.Fatal("系统异常: ", err.Error())
	}
}

---

运行效果：

---

GOROOT=D:\program_file_worker\go1.20 #gosetup

GOPATH=D:\program_file_worker\go1.20\bin;C:\Users\Administrator\go #gosetup

D:\program_file_worker\go1.20\bin\go.exe build -o C:\Users\Administrator\AppData\Local\Temp\GoLand\__go_build_org_jd_data_org_jd_data_database__2.exe D:\program_file\go_workspace\org.jd.data\database\OOPMysqlToDatabaseQueryGrammar.go #gosetup

C:\Users\Administrator\AppData\Local\Temp\GoLand\__go_build_org_jd_data_org_jd_data_database__2.exe

2023/10/18 20:54:42 数据库连接成功!

2023/10/18 20:54:42 {1 100000011 CFO(首席财务官) 北京市朝阳区三里屯大街2000号}

2023/10/18 20:54:42 {2 100000011 CFO(首席财务官) 北京市朝阳区三里屯大街2000号}

2023/10/18 20:54:42 {3 100000011 销售 北京市海淀区马连洼街道200号}

Process finished with the exit code 0

六: go删除数据

package main

import (
	"database/sql"
	// 注册驱动器 _下划线表示执行驱动中的init函数,不使用其他函数
	_ "github.com/go-sql-driver/mysql"
	"log"
)

func main() {
	db, err := sql.Open("mysql", "root:123456@tcp(127.0.0.1:3306)/tope-pay-user")
	deleteCheckErr(err)

	// 延迟执行Closer()函数
	defer db.Close()

	// 验证连接的可用性
	err = db.Ping()
	deleteCheckErr(err)

	log.Println("数据库连接成功! ")

	deleteSql := "delete from `sys_go_dept` where deptid = ? "
	rs, err := db.Exec(deleteSql, 3)
	deleteCheckErr(err)

	rowCount, err := rs.RowsAffected()
	deleteCheckErr(err)

	if rowCount > 0 {
		log.Println("删除成功")
	}

}

func deleteCheckErr(err error) {
	if err != nil {
		log.Fatal("系统异常: ", err.Error())
	}
}

---

运行效果：

---

GOROOT=D:\program_file_worker\go1.20 #gosetup

GOPATH=D:\program_file_worker\go1.20\bin;C:\Users\Administrator\go #gosetup

D:\program_file_worker\go1.20\bin\go.exe build -o C:\Users\Administrator\AppData\Local\Temp\GoLand\__go_build_org_jd_data_org_jd_data_database__5.exe D:\program_file\go_workspace\org.jd.data\database\OOPMysqlToDatabaseDeleteGrammar.go #gosetup

C:\Users\Administrator\AppData\Local\Temp\GoLand\__go_build_org_jd_data_org_jd_data_database__5.exe

2023/10/18 21:02:56 数据库连接成功!

2023/10/18 21:02:56 删除成功

Process finished with the exit code 0

七: go批量插入数据

---

package main

import (
	"database/sql"
	"fmt"
	"log"

	// 注册驱动器 _下划线表示执行驱动中的init函数,不使用其他函数
	_ "github.com/go-sql-driver/mysql"
)

func main() {
	db, err := sql.Open("mysql", "root:123456@tcp(127.0.0.1:3306)/tope-pay-user")
	batchInsertCheckErr(err)

	// 延迟执行Closer()函数
	defer db.Close()

	// 验证连接的可用性
	err = db.Ping()
	batchInsertCheckErr(err)
	sqlStr, params := insertDataMap()
	log.Println("数据库连接成功! ")
	res, _ := db.Exec(sqlStr, params...) // params...: 解构
	id, _ := res.LastInsertId()
	fmt.Printf("lastId: %d insert success!", id)

}

// 插入多条数据
func insertDataMap() (string, []interface{}) {
	data := []map[string]string{
		{"deptno": "100000011", "dname": "CTO首席技术官", "location": "北京市朝阳区三里屯大街20003号"},
		{"deptno": "100000022", "dname": "CTO首席技术官", "location": "北京市海淀区马连洼30003路"},
		{"deptno": "100000033", "dname": "CEO总经理", "location": "北京市昌平区龙泽苑街道200000"},
	}
	batchInsertSql := "insert into `sys_go_dept` (deptno,dname,location)values "
	var values []interface{}
	for index, row := range data {
		if index == len(data)-1 {
			batchInsertSql += "(?, ?, ?)"
		} else {
			batchInsertSql += "(?, ?, ?), "
		}
		values = append(values, row["deptno"], row["dname"], row["location"])
	}

	fmt.Println("batchInsertSql:", batchInsertSql)
	fmt.Println("values: ", values)
	return batchInsertSql, values
}

func batchInsertCheckErr(err error) {
	if err != nil {
		log.Fatal("系统异常: ", err.Error())
	}
}

---

运行效果：

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GOROOT=D:\program_file_worker\go1.20 #gosetup

GOPATH=D:\program_file_worker\go1.20\bin;C:\Users\Administrator\go #gosetup

D:\program_file_worker\go1.20\bin\go.exe build -o C:\Users\Administrator\AppData\Local\Temp\GoLand\__2go_build_org_jd_data_org_jd_data_database__3.exe D:\program_file\go_workspace\org.jd.data\database\OOPMysqlToDatabaseBatchInsertGrammar.go #gosetup

C:\Users\Administrator\AppData\Local\Temp\GoLand\__2go_build_org_jd_data_org_jd_data_database__3.exe

batchInsertSql: insert into `sys_go_dept` (deptno,dname,location)values (?, ?, ?), (?, ?, ?), (?, ?, ?)

values: [100000011 CTO首席技术官 北京市朝阳区三里屯大街20003号 100000022 CTO首席技术官 北京市海淀区马连洼30003路 100000033 CEO总经理 北京市昌平区龙泽苑街道200000]

2023/10/18 21:24:20 数据库连接成功!

lastId: 9 insert success!

Process finished with the exit code 0

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Go操作Mysql驱动实现CRUD完整文档

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