Format and remove 05.4.md spaces
This commit is contained in:
vCaesar
180
zh/05.4.md
180
zh/05.4.md
@@ -19,109 +19,109 @@ Go实现的支持PostgreSQL的驱动也很多，因为国外很多人在开发
|
||||
数据库建表语句：
|
||||
```sql
|
||||
|
||||
CREATE TABLE userinfo
|
||||
(
|
||||
uid serial NOT NULL,
|
||||
username character varying(100) NOT NULL,
|
||||
departname character varying(500) NOT NULL,
|
||||
Created date,
|
||||
CONSTRAINT userinfo_pkey PRIMARY KEY (uid)
|
||||
)
|
||||
WITH (OIDS=FALSE);
|
||||
CREATE TABLE userinfo
|
||||
(
|
||||
uid serial NOT NULL,
|
||||
username character varying(100) NOT NULL,
|
||||
departname character varying(500) NOT NULL,
|
||||
Created date,
|
||||
CONSTRAINT userinfo_pkey PRIMARY KEY (uid)
|
||||
)
|
||||
WITH (OIDS=FALSE);
|
||||
|
||||
CREATE TABLE userdeatail
|
||||
(
|
||||
uid integer,
|
||||
intro character varying(100),
|
||||
profile character varying(100)
|
||||
)
|
||||
WITH(OIDS=FALSE);
|
||||
CREATE TABLE userdeatail
|
||||
(
|
||||
uid integer,
|
||||
intro character varying(100),
|
||||
profile character varying(100)
|
||||
)
|
||||
WITH(OIDS=FALSE);
|
||||
|
||||
```
|
||||
看下面这个Go如何操作数据库表数据:增删改查
|
||||
|
||||
```Go
|
||||
|
||||
package main
|
||||
package main
|
||||
|
||||
import (
|
||||
"database/sql"
|
||||
"fmt"
|
||||
_ "github.com/lib/pq"
|
||||
)
|
||||
import (
|
||||
"database/sql"
|
||||
"fmt"
|
||||
_ "github.com/lib/pq"
|
||||
)
|
||||
|
||||
func main() {
|
||||
db, err := sql.Open("postgres", "user=astaxie password=astaxie dbname=test sslmode=disable")
|
||||
func main() {
|
||||
db, err := sql.Open("postgres", "user=astaxie password=astaxie dbname=test sslmode=disable")
|
||||
checkErr(err)
|
||||
|
||||
//插入数据
|
||||
stmt, err := db.Prepare("INSERT INTO userinfo(username,departname,created) VALUES($1,$2,$3) RETURNING uid")
|
||||
checkErr(err)
|
||||
|
||||
res, err := stmt.Exec("astaxie", "研发部门", "2012-12-09")
|
||||
checkErr(err)
|
||||
|
||||
//pg不支持这个函数，因为他没有类似MySQL的自增ID
|
||||
// id, err := res.LastInsertId()
|
||||
// checkErr(err)
|
||||
// fmt.Println(id)
|
||||
|
||||
var lastInsertId int
|
||||
err = db.QueryRow("INSERT INTO userinfo(username,departname,created) VALUES($1,$2,$3) returning uid;", "astaxie", "研发部门", "2012-12-09").Scan(&lastInsertId)
|
||||
checkErr(err)
|
||||
fmt.Println("最后插入id =", lastInsertId)
|
||||
|
||||
|
||||
//更新数据
|
||||
stmt, err = db.Prepare("update userinfo set username=$1 where uid=$2")
|
||||
checkErr(err)
|
||||
|
||||
res, err = stmt.Exec("astaxieupdate", 1)
|
||||
checkErr(err)
|
||||
|
||||
affect, err := res.RowsAffected()
|
||||
checkErr(err)
|
||||
|
||||
fmt.Println(affect)
|
||||
|
||||
//查询数据
|
||||
rows, err := db.Query("SELECT * FROM userinfo")
|
||||
checkErr(err)
|
||||
|
||||
for rows.Next() {
|
||||
var uid int
|
||||
var username string
|
||||
var department string
|
||||
var created string
|
||||
err = rows.Scan(&uid, &username, &department, &created)
|
||||
checkErr(err)
|
||||
|
||||
//插入数据
|
||||
stmt, err := db.Prepare("INSERT INTO userinfo(username,departname,created) VALUES($1,$2,$3) RETURNING uid")
|
||||
checkErr(err)
|
||||
|
||||
res, err := stmt.Exec("astaxie", "研发部门", "2012-12-09")
|
||||
checkErr(err)
|
||||
|
||||
//pg不支持这个函数，因为他没有类似MySQL的自增ID
|
||||
// id, err := res.LastInsertId()
|
||||
// checkErr(err)
|
||||
// fmt.Println(id)
|
||||
|
||||
var lastInsertId int
|
||||
err = db.QueryRow("INSERT INTO userinfo(username,departname,created) VALUES($1,$2,$3) returning uid;", "astaxie", "研发部门", "2012-12-09").Scan(&lastInsertId)
|
||||
checkErr(err)
|
||||
fmt.Println("最后插入id =", lastInsertId)
|
||||
|
||||
|
||||
//更新数据
|
||||
stmt, err = db.Prepare("update userinfo set username=$1 where uid=$2")
|
||||
checkErr(err)
|
||||
|
||||
res, err = stmt.Exec("astaxieupdate", 1)
|
||||
checkErr(err)
|
||||
|
||||
affect, err := res.RowsAffected()
|
||||
checkErr(err)
|
||||
|
||||
fmt.Println(affect)
|
||||
|
||||
//查询数据
|
||||
rows, err := db.Query("SELECT * FROM userinfo")
|
||||
checkErr(err)
|
||||
|
||||
for rows.Next() {
|
||||
var uid int
|
||||
var username string
|
||||
var department string
|
||||
var created string
|
||||
err = rows.Scan(&uid, &username, &department, &created)
|
||||
checkErr(err)
|
||||
fmt.Println(uid)
|
||||
fmt.Println(username)
|
||||
fmt.Println(department)
|
||||
fmt.Println(created)
|
||||
}
|
||||
|
||||
//删除数据
|
||||
stmt, err = db.Prepare("delete from userinfo where uid=$1")
|
||||
checkErr(err)
|
||||
|
||||
res, err = stmt.Exec(1)
|
||||
checkErr(err)
|
||||
|
||||
affect, err = res.RowsAffected()
|
||||
checkErr(err)
|
||||
|
||||
fmt.Println(affect)
|
||||
|
||||
db.Close()
|
||||
|
||||
fmt.Println(uid)
|
||||
fmt.Println(username)
|
||||
fmt.Println(department)
|
||||
fmt.Println(created)
|
||||
}
|
||||
|
||||
func checkErr(err error) {
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
//删除数据
|
||||
stmt, err = db.Prepare("delete from userinfo where uid=$1")
|
||||
checkErr(err)
|
||||
|
||||
res, err = stmt.Exec(1)
|
||||
checkErr(err)
|
||||
|
||||
affect, err = res.RowsAffected()
|
||||
checkErr(err)
|
||||
|
||||
fmt.Println(affect)
|
||||
|
||||
db.Close()
|
||||
|
||||
}
|
||||
|
||||
func checkErr(err error) {
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
从上面的代码我们可以看到，PostgreSQL是通过`$1`,`$2`这种方式来指定要传递的参数，而不是MySQL中的`?`，另外在sql.Open中的dsn信息的格式也与MySQL的驱动中的dsn格式不一样，所以在使用时请注意它们的差异。
|
||||
|
||||
Reference in New Issue
Block a user