golanggolangodbcmssqlodbcDM8odbc参考博客1、参考博客2
odbcgolang一些参考文档：
package main
import (
"fmt"
_ "github.com/alexbrainman/odbc" // google's odbc driver
"github.com/go-xorm/xorm"
"xorm.io/core"
"github.com/axgle/mahonia"
)
type Address struct {
Addressid int64 `xorm:"addressid"`
Address1 string `xorm:"address1"`
Address2 string `xorm:"address2"`
City string `xorm:"city"`
Postalcode string `xorm:"postalcode"`
}
// 字符串解码函数，处理中文乱码
func ConvertToString(src string, srcCode string, tagCode string) string {
srcCoder := mahonia.NewDecoder(srcCode)
srcResult := srcCoder.ConvertString(src)
tagCoder := mahonia.NewDecoder(tagCode)
_, cdata, _ := tagCoder.Translate([]byte(srcResult), true)
result := string(cdata)
return result
}
func main() {
engine, err := xorm.NewEngine("odbc", "driver={DM8 ODBC DRIVER};server=127.0.0.1:5236;database=DM;uid=SYSDBA;pwd=password;charset=utf8")
if err != nil {
fmt.Println("new engine got error:", err)
return
}
engine.ShowSQL(true)//控制台打印出生成的SQL语句；
engine.Logger().SetLevel(core.LOG_DEBUG)
if err := engine.Ping(); err != nil {
fmt.Println("ping got error:", err)
return
}
// 1) sql查询
results, err := engine.Query("select addressid, address1, address2, city, postalcode from person.address limit 5 offset 2")
if err != nil {
fmt.Println("查询出错:", err)
return
}
for i, e := range results {
fmt.Printf("%vt", i)
for k, v := range e {
// 达梦数据库中文默认为gbk
fmt.Printf("%v=%vt", k, ConvertToString(string(v), "gbk", "utf-8"))
}
fmt.Printf("n")
}
fmt.Println("*******************************")
// 2） 使用struct 映射结果
engine.SetMapper(core.SameMapper{})
var sliceOfAddress []Address
err = engine.Table("person.address").Limit(5, 0).Find(&sliceOfAddress)
if err != nil {
fmt.Println("查询出错:", err)
return
}
for i,e := range sliceOfAddress {
e.Address1 = ConvertToString(e.Address1, "gbk", "utf-8")
e.Address2 = ConvertToString(e.Address2, "gbk", "utf-8")
e.City = ConvertToString(e.City, "gbk", "utf-8")
fmt.Printf("%v=%vn", i, e)
}
}
坑
1）解决 golang.org/x/ 下包下载不下来的问题
https://studygolang.com/articles/19051?fr=sidebar
https://studygolang.com/articles/24075?fr=sidebar
2）无效的表或视图名[person.address]（这个也是最坑的一点）
1) SQL查询2) struct 查询[xorm] [info] 2020/06/08 16:52:40.183731 [SQL] SELECT TOP 5 "addressid", "address1", "address2", "city", "postalcode" FROM "person.address"
查询出错: SQLPrepare: {42S02} 第1 行附近出现错误:
无效的表或视图名[person.address]
SELECT TOP 5 "addressid", "address1", "address2", "city", "postalcode" FROM "person.address"
xorm:"addressid"engine.Table("person.address").Limit(5, 0).Find(&sliceOfAddress)enginFind()src.github.com/go-xorm/xorm/engine.go// Find retrieve records from table, condiBeans's non-empty fields
// are conditions. beans could be []Struct, []*Struct, map[int64]Struct
// map[int64]*Struct
func (engine *Engine) Find(beans interface{}, condiBeans ...interface{}) error {
session := engine.NewSession()
defer session.Close()
return session.Find(beans, condiBeans...)
}
session.Find()src.github.com/go-xorm/session_find.go// Find retrieve records from table, condiBeans's non-empty fields
// are conditions. beans could be []Struct, []*Struct, map[int64]Struct
// map[int64]*Struct
func (session *Session) Find(rowsSlicePtr interface{}, condiBean ...interface{}) error {
if session.isAutoClose {
defer session.Close()
}
return session.find(rowsSlicePtr, condiBean...)
}
session.find(rowsSlicePtr, condiBean...)func (session *Session) find(rowsSlicePtr interface{}, condiBean ...interface{}) error {
defer session.resetStatement()
// 代码省略 。。。
var sqlStr string
var args []interface{}
var err error
// 此处就是拼接sql的代码
if session.statement.RawSQL == "" {
// 代码省略 。。。
} else {
sqlStr = session.statement.RawSQL
args = session.statement.RawParams
}
// 获得配置信息判断当前数据库类型
uri := session.engine.Dialect().URI()
// 判断当前是否是达梦数据库
if uri.DbType == "mssql" && uri.DbName == "DM" {
newSqlStr := strings.Replace(sqlStr, """, "", -1) // 去掉双引号
sqlStr = newSqlStr
}
// 代码省略 。。。
return session.noCacheFind(table, sliceValue, sqlStr, args...)
}
session.engine.Dialect().URI()xorm.NewEngine()enginedialectsrc.github.com/go-xorm/xorm/xorm.goengine := &Engine{
db: db,
dialect: dialect,
Tables: make(map[reflect.Type]*core.Table),
mutex: &sync.RWMutex{},
TagIdentifier: "xorm",
TZLocation: time.Local,
tagHandlers: defaultTagHandlers,
cachers: make(map[string]core.Cacher),
defaultContext: context.Background(),
}
找到sql之后去掉双引号即可，因为做了判断只有是达梦的类型数据库的时候才修改，所以不会影响其他类型的数据库。至此问题得到了解决。
输出结果：
[xorm] [info] 2020/06/08 17:14:18.061667 PING DATABASE odbc
[xorm] [info] 2020/06/08 17:14:19.315349 [SQL] select addressid, address1, address2, city, postalcode from person.address limit 5 offset 2
0 ADDRESSID=3 ADDRESS1=青山区青翠苑1号 ADDRESS2= CITY=武汉市青山区 POSTALCODE=430080
1 ADDRESSID=4 ADDRESS1=武昌区武船新村115号 ADDRESS2= CITY=武汉市武昌区 POSTALCODE=430063
2 ADDRESSID=5 ADDRESS1=汉阳大道熊家湾15号 ADDRESS2= CITY=武汉市汉阳区 POSTALCODE=430050
3 ADDRESSID=6 ADDRESS1=洪山区保利花园50-1-304 ADDRESS2= CITY=武汉市洪山区 POSTALCODE=430073
4 ADDRESSID=7 ADDRESS1=洪山区保利花园51-1-702 ADDRESS2= CITY=武汉市洪山区 POSTALCODE=430073
*******************************
[xorm] [info] 2020/06/08 17:14:19.324291 [SQL] SELECT TOP 5 addressid, address1, address2, city, postalcode FROM person.address
0={1 洪山区369号金地太阳城56-1-202 武汉市洪山区 430073}
1={2 洪山区369号金地太阳城57-2-302 武汉市洪山区 430073}
2={3 青山区青翠苑1号 武汉市青山区 430080}
3={4 武昌区武船新村115号 武汉市武昌区 430063}
4={5 汉阳大道熊家湾15号 武汉市汉阳区 430050}
参考文档
xorm的操作指南
xorm的pkg文档
go语言中文文档