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client.go
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client.go
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package gluasql_mysql
import (
"database/sql"
"time"
_ "github.com/go-sql-driver/mysql"
"github.com/yuin/gopher-lua"
)
const (
CLIENT_TYPENAME = "mysql{client}"
)
// Client mysql
type Client struct {
DB *sql.DB
Timeout time.Duration
}
var clientMethods = map[string]lua.LGFunction{
"connect": clientConnectMethod,
"set_timeout": clientSetTimeoutMethod,
"set_keepalive": clientSetKeepaliveMethod,
"close": clientCloseMethod,
"query": clientQueryMethod,
}
func checkClient(L *lua.LState) *Client {
ud := L.CheckUserData(1)
if v, ok := ud.Value.(*Client); ok {
return v
}
L.ArgError(1, "client expected")
return nil
}
func clientCloseMethod(L *lua.LState) int {
client := checkClient(L)
if client.DB == nil {
L.Push(lua.LBool(true))
return 1
}
err := client.DB.Close()
// always clean
client.DB = nil
if err != nil {
L.Push(lua.LBool(false))
L.Push(lua.LString(err.Error()))
return 2
}
L.Push(lua.LBool(true))
return 1
}
func clientSetKeepaliveMethod(L *lua.LState) int {
client := checkClient(L)
idleTimeout := L.ToInt64(2) // timeout (in ms)
poolSize := L.ToInt(3)
if client.DB == nil {
L.Push(lua.LBool(true))
L.Push(lua.LString("connect required"))
return 2
}
client.DB.SetConnMaxLifetime(time.Millisecond * time.Duration(idleTimeout))
client.DB.SetMaxIdleConns(poolSize)
L.Push(lua.LBool(true))
return 1
}