Go语言·操作MySQL出现404 Not Found
Golang·操作MySQL出现 runtime error: invalid memory address or nil pointer dereference
http: panic serving 127.0.0.1:59845: runtime error: invalid memory address or nil pointer dereference
goroutine 2377 [running]:
net/http.(*conn).serve.func1()
/usr/local/go/src/net/http/server.go:1825 +0xbf
panic({0x12820c0, 0x14bb900})
/usr/local/go/src/runtime/panic.go:844 +0x258
database/sql.(*Rows).Next(0x0)
/usr/local/go/src/database/sql/sql.go:2985 +0x27
golang/life.QueryLife_data({0x12c333b, 0x9}, {0x12c42c6, 0xc}, {0xc00018c339, 0x4}, {0xc00018c345, 0x2})
/Volumes/Linwute/项目/Golang/life/query_Life.go:175 +0x256
main.getLifeListQuery({0x133de10, 0xc000a542a0}, 0xc000a50300)
/Volumes/Linwute/项目/Golang/main.go:42 +0x1a7
net/http.HandlerFunc.ServeHTTP(0x0?, {0x133de10?, 0xc000a542a0?}, 0x10625d6?)
/usr/local/go/src/net/http/server.go:2084 +0x2f
net/http.(*ServeMux).ServeHTTP(0x0?, {0x133de10, 0xc000a542a0}, 0xc000a50300)
/usr/local/go/src/net/http/server.go:2462 +0x149原因很简单：
如代码中第10行 ：/Volumes/Linwute/项目/Golang/life/query_Life.go:175 +0x256
其就是175行 出问题，根本原因是数据库链接池过大，没有关闭数据库导致。
在数据库操作代码结束加上如下：
rows.Close() //关闭结果集（释放连接
Db.Close() //关闭数据库
必须关闭Db.Close关闭数据库 否则并发连接池过大，请求超50次会导致数据库宕机404或502
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