dbquery/conn.go

package dbquery

import (
	"database/sql"
	"log"

	"errors"
	"strings"
	"time"

	"git.tetele.net/tgo/helper"

	_ "github.com/go-sql-driver/mysql"
)

var DB *sql.DB

func Connect(DBHOST, DBUSER, DBPWD, DBNAME, DBPORT string, conns ...int) error {

	log.Println("database connectting...")
	var dbConnErr error
	if DBHOST != "" && DBUSER != "" && DBPWD != "" && DBPORT != "" { //&& DBNAME != ""

		for i := 0; i < 10; i++ {
			DB, dbConnErr = sql.Open("mysql", DBUSER+":"+DBPWD+"@tcp("+DBHOST+":"+DBPORT+")/"+DBNAME+"?charset=utf8mb4")
			if dbConnErr != nil {
				log.Println("ERROR", "can not connect to Database, ", dbConnErr)
				time.Sleep(time.Second * 5)
			} else {
				if len(conns) > 0 {
					DB.SetMaxOpenConns(conns[0]) //用于设置最大打开的连接数，默认值为0表示不限制
				} else {
					DB.SetMaxOpenConns(200) //默认值为0表示不限制
				}
				if len(conns) > 1 {
					DB.SetMaxIdleConns(conns[1]) //用于设置闲置的连接数
				} else {
					DB.SetMaxIdleConns(50)
				}

				DB.Ping()

				log.Println("database connected")
				DB.SetConnMaxLifetime(time.Minute * 2)
				break
			}
		}
	} else {
		return errors.New("db connection params errors")
	}
	return dbConnErr
}

func CloseConn() error {
	return DB.Close()
}

/**
 * 检测表名
 */
func getTableName(dbName, table string, dbtype ...string) string {

	var db_type string = "mysql"

	if len(dbtype) > 0 {
		if dbtype[0] != "" {
			db_type = dbtype[0]
		}
	}

	var ret string

	switch db_type {

	case "mysql":

		if strings.Contains(table, ".") {
			ret = table
		}
		if dbName != "" {
			ret = helper.StringJoin(dbName, ".", table)
		} else {
			ret = table
		}

	case "mssql":
		ret = helper.StringJoin(dbName, ".", table)

	}
	return ret
}

func GetDbTableName(dbName, table string) string {
	return getTableName(dbName, table)
}

func judg() []string {
	return []string{"=", ">", "<", "!=", "<=", ">="}
}