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Maryam Behzadi
2018-05-27 18:19:12 +04:30
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fa/eBook/05.0.md
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# 5 Database
For web developers, the database is at the core of web development. You can save almost anything into a database and query or update data inside it, like user information, products or news articles.
Go doesn't provide any database drivers, but it does have a driver interface defined in the `database/sql` package. People can develop database drivers based on that interface. In section 5.1, we are going to talk about database driver interface design in Go; in sections 5.2 to 5.4, I will introduce some SQL database drivers to you; in section 5.5, i'll present the ORM　that i've developed which is based on the `database/sql` interface standard. It's compatible with most drivers that have implemented the `database/sql` interface, and it makes it easy to access databases idiomatically in Go.
NoSQL has been a hot topic in recent years. More websites are deciding to use NoSQL databases as their main database instead of just for the purpose of caching. I will introduce you to two NoSQL databases, which are MongoDB and Redis, in section 5.6.
## Links
- [Directory](preface.md)
- Previous Chapter: [Chapter 4 Summary](04.6.md)
- Next section: [database/sql interface](05.1.md)

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fa/eBook/05.0.md.orig
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# 5 Database
For web developers, the database is at the core of web development. You can save almost anything into a database and query or update data inside it, like user information, products or news articles.
Go doesn't provide any database drivers, but it does have a driver interface defined in the `database/sql` package. People can develop database drivers based on that interface. In section 5.1, we are going to talk about database driver interface design in Go; in sections 5.2 to 5.4, I will introduce some SQL database drivers to you; in section 5.5, i'll present the ORM　that i've developed which is based on the `database/sql` interface standard. It's compatible with most drivers that have implemented the `database/sql` interface, and it makes it easy to access databases idiomatically in Go.
NoSQL has been a hot topic in recent years. More websites are deciding to use NoSQL databases as their main database instead of just for the purpose of caching. I will introduce you to two NoSQL databases, which are MongoDB and Redis, in section 5.6.
## Links
- [Directory](preface.md)
- Previous Chapter: [Chapter 4 Summary](04.6.md)
- Next section: [database/sql interface](05.1.md)

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fa/src/1.2/main.go
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// 章节 1.2
// $GOPATH/src/mathapp/main.go
package main
import (
"fmt"
"mymath"
)
func main() {
fmt.Printf("Hello, world. Sqrt(2) = %v\n", mymath.Sqrt(2))
}

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fa/src/1.2/sqrt.go
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// 章节 1.2
// $GOPATH/src/mymath/sqrt.go
package mymath
func Sqrt(x float64) float64 {
z := 0.0
for i := 0; i < 1000; i++ {
z -= (z*z - x) / (2 * x)
}
return z
}