beego pro add mysql source type

internal/app/module/beegopro/container.go

@@ -20,7 +20,7 @@ var DefaultBeegoPro = &Container{
 	BeegoProFile:  system.CurrentDir + "/beegopro.toml",
 	TimestampFile: system.CurrentDir + "/beegopro.timestamp",
 	GoModFile:     system.CurrentDir + "/go.mod",
-	Option: Option{
+	UserOption: UserOption{
 		Debug:          false,
 		ContextDebug:   false,
 		Dsn:            "",
@@ -28,7 +28,7 @@ var DefaultBeegoPro = &Container{
 		ProType:        "default",
 		ApiPrefix:      "/",
 		EnableModule:   nil,
-		Models:         make(map[string]ModelContent, 0),
+		Models:         make(map[string]TextModel, 0),
 		GitRemotePath:  "https://github.com/beego-dev/beego-pro.git",
 		Branch:         "master",
 		GitLocalPath:   system.BeegoHome + "/beego-pro",
@@ -43,7 +43,7 @@ var DefaultBeegoPro = &Container{
 	},
 	GenerateTime:     time.Now().Format(MDateFormat),
 	GenerateTimeUnix: time.Now().Unix(),
-	Tmpl:             Tmpl{},
+	TmplOption:       TmplOption{},
 	CurPath:          system.CurrentDir,
 	EnableModules:    make(map[string]interface{}, 0), // get the user configuration, get the enable module result
 	FunctionOnce:     make(map[string]sync.Once, 0),   // get the tmpl configuration, get the function once result
@@ -52,13 +52,14 @@ var DefaultBeegoPro = &Container{
 func (c *Container) Run() {
 	// init git refresh cache time
 	c.initTimestamp()
-	c.initBeegoPro()
-	c.initBeegoTmpl()
+	c.initUserOption()
+	c.initTemplateOption()
+	c.initParser()
 	c.initRender()
 	c.flushTimestamp()
 }
 
-func (c *Container) initBeegoPro() {
+func (c *Container) initUserOption() {
 	if !utils.IsExist(c.BeegoProFile) {
 		beeLogger.Log.Fatalf("beego pro config is not exist, beego json path: %s", c.BeegoProFile)
 		return
@@ -70,23 +71,23 @@ func (c *Container) initBeegoPro() {
 		return
 	}
 
-	err = viper.Unmarshal(&c.Option)
+	err = viper.Unmarshal(&c.UserOption)
 	if err != nil {
 		beeLogger.Log.Fatalf("beego pro config unmarshal error, err: %s", err.Error())
 		return
 	}
-	if c.Option.Debug {
+	if c.UserOption.Debug {
 		viper.Debug()
 	}
 
-	if c.Option.EnableGomod {
+	if c.UserOption.EnableGomod {
 		if !utils.IsExist(c.GoModFile) {
 			beeLogger.Log.Fatalf("go mod not exist, please create go mod file")
 			return
 		}
 	}
 
-	for _, value := range c.Option.EnableModule {
+	for _, value := range c.UserOption.EnableModule {
 		c.EnableModules[value] = struct{}{}
 	}
 
@@ -94,14 +95,15 @@ func (c *Container) initBeegoPro() {
 		c.EnableModules["*"] = struct{}{}
 	}
 
-	if c.Option.Debug {
+	if c.UserOption.Debug {
 		fmt.Println("c.modules", c.EnableModules)
 	}
+
 }
 
-func (c *Container) initBeegoTmpl() {
-	if c.Option.EnableGitPull && (c.GenerateTimeUnix-c.Timestamp.GitCacheLastRefresh > c.Option.RefreshGitTime) {
-		err := git.CloneORPullRepo(c.Option.GitRemotePath, c.Option.GitLocalPath)
+func (c *Container) initTemplateOption() {
+	if c.UserOption.EnableGitPull && (c.GenerateTimeUnix-c.Timestamp.GitCacheLastRefresh > c.UserOption.RefreshGitTime) {
+		err := git.CloneORPullRepo(c.UserOption.GitRemotePath, c.UserOption.GitLocalPath)
 		if err != nil {
 			beeLogger.Log.Fatalf("beego pro git clone or pull repo error, err: %s", err)
 			return
@@ -109,59 +111,49 @@ func (c *Container) initBeegoTmpl() {
 		c.Timestamp.GitCacheLastRefresh = c.GenerateTimeUnix
 	}
 
-	tree, err := toml.LoadFile(c.Option.GitLocalPath + "/" + c.Option.ProType + "/bee.toml")
+	tree, err := toml.LoadFile(c.UserOption.GitLocalPath + "/" + c.UserOption.ProType + "/bee.toml")
 
 	if err != nil {
 		beeLogger.Log.Fatalf("beego tmpl exec error, err: %s", err)
 		return
 	}
-	err = tree.Unmarshal(&c.Tmpl)
+	err = tree.Unmarshal(&c.TmplOption)
 	if err != nil {
 		beeLogger.Log.Fatalf("beego tmpl parse error, err: %s", err)
 		return
 	}
 
-	if c.Option.Debug {
-		spew.Dump("tmpl", c.Tmpl)
+	if c.UserOption.Debug {
+		spew.Dump("tmpl", c.TmplOption)
 	}
 
-	for _, value := range c.Tmpl.Descriptor {
+	for _, value := range c.TmplOption.Descriptor {
 		if value.Once == true {
 			c.FunctionOnce[value.SrcName] = sync.Once{}
 		}
 	}
 }
 
-type modelInfo struct {
-	Module       string
-	ModelName    string
-	Option       Option
-	Content      ModelContent
-	Descriptor   Descriptor
-	TmplPath     string
-	GenerateTime string
+func (c *Container) initParser() {
+	driver, flag := ParserDriver[c.UserOption.SourceGen]
+	if !flag {
+		beeLogger.Log.Fatalf("parse driver not exit, source gen %s", c.UserOption.SourceGen)
+	}
+	driver.RegisterOption(c.UserOption, c.TmplOption)
+	c.Parser = driver
 }
 
 func (c *Container) initRender() {
-	for _, desc := range c.Tmpl.Descriptor {
+	for _, desc := range c.TmplOption.Descriptor {
 		_, allFlag := c.EnableModules["*"]
 		_, moduleFlag := c.EnableModules[desc.Module]
 		if !allFlag && !moduleFlag {
 			continue
 		}
 
+		models := c.Parser.GetRenderInfos(desc)
 		// model table name, model table schema
-		for modelName, content := range c.Option.Models {
-			m := modelInfo{
-				Module:       desc.Module,
-				ModelName:    modelName,
-				Content:      content,
-				Option:       c.Option,
-				Descriptor:   desc,
-				TmplPath:     c.Tmpl.RenderPath,
-				GenerateTime: c.GenerateTime,
-			}
-
+		for _, m := range models {
 			// some render exec once
 			syncOnce, flag := c.FunctionOnce[desc.SrcName]
 			if flag {
@@ -175,7 +167,9 @@ func (c *Container) initRender() {
 	}
 }
 
-func (c *Container) renderModel(m modelInfo) {
+func (c *Container) renderModel(m RenderInfo) {
+	// todo optimize
+	m.GenerateTime = c.GenerateTime
 	render := NewRender(m)
 	render.Exec(m.Descriptor.SrcName)
 	if render.Descriptor.IsExistScript() {

internal/app/module/beegopro/migration.go

@@ -11,10 +11,10 @@ import (
 var SQL utils.DocValue
 
 func (c *Container) Migration(args []string) {
-	c.initBeegoPro()
-	db, err := sql.Open(c.Option.Driver, c.Option.Dsn)
+	c.initUserOption()
+	db, err := sql.Open(c.UserOption.Driver, c.UserOption.Dsn)
 	if err != nil {
-		beeLogger.Log.Fatalf("Could not connect to '%s' database using '%s': %s", c.Option.Driver, c.Option.Dsn, err)
+		beeLogger.Log.Fatalf("Could not connect to '%s' database using '%s': %s", c.UserOption.Driver, c.UserOption.Dsn, err)
 		return
 	}
 

internal/app/module/beegopro/parser.go

@@ -0,0 +1,13 @@
+package beegopro
+
+type Parser interface {
+	RegisterOption(userOption UserOption, tmplOption TmplOption)
+	Parse(descriptor Descriptor)
+	GetRenderInfos(descriptor Descriptor) (output []RenderInfo)
+	Unregister()
+}
+
+var ParserDriver = map[string]Parser{
+	"text":  &TextParser{},
+	"mysql": &MysqlParser{},
+}

internal/app/module/beegopro/parser_mysql.go

@@ -0,0 +1,88 @@
+package beegopro
+
+import (
+	"database/sql"
+	"fmt"
+	"github.com/beego/bee/internal/pkg/utils"
+	beeLogger "github.com/beego/bee/logger"
+)
+
+type MysqlParser struct {
+	userOption UserOption
+	tmplOption TmplOption
+	db         *sql.DB
+}
+
+func (m *MysqlParser) RegisterOption(userOption UserOption, tmplOption TmplOption) {
+	m.userOption = userOption
+	m.tmplOption = tmplOption
+
+}
+
+func (*MysqlParser) Parse(descriptor Descriptor) {
+
+}
+
+func (m *MysqlParser) GetRenderInfos(descriptor Descriptor) (output []RenderInfo) {
+	tableSchemas, err := m.getTableSchemas()
+	if err != nil {
+		beeLogger.Log.Fatalf("get table schemas err %s", err)
+	}
+	models := tableSchemas.ToTableMap()
+
+	output = make([]RenderInfo, 0)
+	// model table name, model table schema
+	for modelName, content := range models {
+		output = append(output, RenderInfo{
+			Module:     descriptor.Module,
+			ModelName:  modelName,
+			Content:    content,
+			Option:     m.userOption,
+			Descriptor: descriptor,
+			TmplPath:   m.tmplOption.RenderPath,
+		})
+	}
+	return
+}
+
+func (t *MysqlParser) Unregister() {
+
+}
+
+func (m *MysqlParser) getTableSchemas() (resp TableSchemas, err error) {
+	dsn, err := utils.ParseDSN(m.userOption.Dsn)
+	if err != nil {
+		beeLogger.Log.Fatalf("parse dsn err %s", err)
+		return
+	}
+
+	conn, err := sql.Open("mysql", fmt.Sprintf("%s:%s@tcp(%s)/information_schema", dsn.User, dsn.Passwd, dsn.Addr))
+	if err != nil {
+		beeLogger.Log.Fatalf("Could not connect to mysql database using '%s': %s", m.userOption.Dsn, err)
+		return
+	}
+	defer conn.Close()
+
+	q := `SELECT TABLE_NAME, COLUMN_NAME, IS_NULLABLE, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, 
+NUMERIC_PRECISION, NUMERIC_SCALE,COLUMN_TYPE,COLUMN_KEY,COLUMN_COMMENT 
+FROM COLUMNS WHERE TABLE_SCHEMA = ?  ORDER BY TABLE_NAME, ORDINAL_POSITION`
+	rows, err := conn.Query(q, dsn.DBName)
+	if err != nil {
+		return nil, err
+	}
+	columns := make(TableSchemas, 0)
+	for rows.Next() {
+		cs := TableSchema{}
+		err := rows.Scan(&cs.TableName, &cs.ColumnName, &cs.IsNullable, &cs.DataType,
+			&cs.CharacterMaximumLength, &cs.NumericPrecision, &cs.NumericScale,
+			&cs.ColumnType, &cs.ColumnKey, &cs.Comment)
+		if err != nil {
+			return nil, err
+		}
+		columns = append(columns, cs)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return columns, nil
+}

internal/app/module/beegopro/parser_text.go

@@ -0,0 +1,35 @@
+package beegopro
+
+type TextParser struct {
+	userOption UserOption
+	tmplOption TmplOption
+}
+
+func (t *TextParser) RegisterOption(userOption UserOption, tmplOption TmplOption) {
+	t.userOption = userOption
+	t.tmplOption = tmplOption
+}
+
+func (*TextParser) Parse(descriptor Descriptor) {
+
+}
+
+func (t *TextParser) GetRenderInfos(descriptor Descriptor) (output []RenderInfo) {
+	output = make([]RenderInfo, 0)
+	// model table name, model table schema
+	for modelName, content := range t.userOption.Models {
+		output = append(output, RenderInfo{
+			Module:     descriptor.Module,
+			ModelName:  modelName,
+			Content:    content.ToModelInfos(),
+			Option:     t.userOption,
+			Descriptor: descriptor,
+			TmplPath:   t.tmplOption.RenderPath,
+		})
+	}
+	return
+}
+
+func (t *TextParser) Unregister() {
+
+}

internal/app/module/beegopro/render.go

@@ -15,7 +15,7 @@ type RenderFile struct {
 	*pongo2render.Render
 	Context      pongo2.Context
 	GenerateTime string
-	Option       Option
+	Option       UserOption
 	ModelName    string
 	PackageName  string
 	FlushFile    string
@@ -24,7 +24,7 @@ type RenderFile struct {
 	Descriptor   Descriptor
 }
 
-func NewRender(m modelInfo) *RenderFile {
+func NewRender(m RenderInfo) *RenderFile {
 	var (
 		pathCtx       pongo2.Context
 		newDescriptor Descriptor

internal/app/module/beegopro/schema.go

@@ -18,46 +18,41 @@ type Container struct {
 	BeegoProFile     string                 // beego pro toml
 	TimestampFile    string                 // store ts file
 	GoModFile        string                 // go mod file
-	Option           Option                 // user option
-	Tmpl             Tmpl                   // remote tmpl
+	UserOption       UserOption             // user option
+	TmplOption       TmplOption             // tmpl option
 	CurPath          string                 // user current path
 	EnableModules    map[string]interface{} // beego pro provider a collection of module
 	FunctionOnce     map[string]sync.Once   // exec function once
 	Timestamp        Timestamp
 	GenerateTime     string
 	GenerateTimeUnix int64
+	Parser           Parser
 }
 
 // user option
-type Option struct {
-	Debug          bool                    `json:"debug"`
-	ContextDebug   bool                    `json:"contextDebug"`
-	Dsn            string                  `json:"dsn"`
-	Driver         string                  `json:"driver"`
-	ProType        string                  `json:"proType"`
-	ApiPrefix      string                  `json:"apiPrefix"`
-	EnableModule   []string                `json:"enableModule"`
-	Models         map[string]ModelContent `json:"models"`
-	GitRemotePath  string                  `json:"gitRemotePath"`
-	Branch         string                  `json:"branch"`
-	GitLocalPath   string                  `json:"gitLocalPath"`
-	EnableFormat   bool                    `json:"enableFormat"`
-	SourceGen      string                  `json:"sourceGen"`
-	EnableGitPull  bool                    `json:"enbaleGitPull"`
-	Path           map[string]string       `json:"path"`
-	EnableGomod    bool                    `json:"enableGomod"`
-	RefreshGitTime int64                   `json:"refreshGitTime"`
-	Extend         map[string]string       `json:"extend"` // extend user data
-}
-
-type BeegoPro struct {
-	FilePath string
-	CurPath  string
-	Option   Option
+type UserOption struct {
+	Debug          bool                 `json:"debug"`
+	ContextDebug   bool                 `json:"contextDebug"`
+	Dsn            string               `json:"dsn"`
+	Driver         string               `json:"driver"`
+	ProType        string               `json:"proType"`
+	ApiPrefix      string               `json:"apiPrefix"`
+	EnableModule   []string             `json:"enableModule"`
+	Models         map[string]TextModel `json:"models"`
+	GitRemotePath  string               `json:"gitRemotePath"`
+	Branch         string               `json:"branch"`
+	GitLocalPath   string               `json:"gitLocalPath"`
+	EnableFormat   bool                 `json:"enableFormat"`
+	SourceGen      string               `json:"sourceGen"`
+	EnableGitPull  bool                 `json:"enbaleGitPull"`
+	Path           map[string]string    `json:"path"`
+	EnableGomod    bool                 `json:"enableGomod"`
+	RefreshGitTime int64                `json:"refreshGitTime"`
+	Extend         map[string]string    `json:"extend"` // extend user data
 }
 
 // tmpl option
-type Tmpl struct {
+type TmplOption struct {
 	RenderPath string `toml:"renderPath"`
 	Descriptor []Descriptor
 }
@@ -126,7 +121,6 @@ func (d Descriptor) ExecScript(path string) (err error) {
 	if len(arr) == 0 {
 		return
 	}
-	fmt.Println("path------>", path)
 
 	stdout, stderr, err := command.ExecCmdDir(path, arr[0], arr[1:]...)
 	if err != nil {
@@ -134,7 +128,6 @@ func (d Descriptor) ExecScript(path string) (err error) {
 	}
 
 	beeLogger.Log.Info(stdout)
-
 	return nil
 }
 

internal/app/module/beegopro/schema_model.go

@@ -1,18 +1,11 @@
 package beegopro
 
 import (
-	beeLogger "github.com/beego/bee/logger"
 	"github.com/beego/bee/utils"
 	"strings"
 )
 
-type ModelContent struct {
-	Names    []string
-	Orms     []string
-	Comments []string
-	Extends  []string
-}
-
+// parse get the model info
 type ModelInfo struct {
 	Name      string `json:"name"`      // mysql name
 	InputType string `json:"inputType"` // user input type
@@ -37,49 +30,12 @@ func (m ModelInfo) IsPrimaryKey() (flag bool) {
 	return
 }
 
-func (content ModelContent) ToModelInfoArr() (output []ModelInfo) {
-	namesLen := len(content.Names)
-	ormsLen := len(content.Orms)
-	commentsLen := len(content.Comments)
-	if namesLen != ormsLen && namesLen != commentsLen {
-		beeLogger.Log.Fatalf("length error, namesLen is %d, ormsLen is %d, commentsLen is %d", namesLen, ormsLen, commentsLen)
-	}
-	extendLen := len(content.Extends)
-	if extendLen != 0 && extendLen != namesLen {
-		beeLogger.Log.Fatalf("extend length error, namesLen is %d, extendsLen is %d", namesLen, extendLen)
-	}
-
-	output = make([]ModelInfo, 0)
-	for i, name := range content.Names {
-		comment := content.Comments[i]
-		if comment == "" {
-			comment = name
-		}
-		inputType, goType, mysqlType, ormTag := getModelType(content.Orms[i])
-
-		m := ModelInfo{
-			Name:      name,
-			InputType: inputType,
-			GoType:    goType,
-			Orm:       ormTag,
-			Comment:   comment,
-			MysqlType: mysqlType,
-			Extend:    "",
-		}
-		// extend value
-		if extendLen != 0 {
-			m.Extend = content.Extends[i]
-		}
-		output = append(output, m)
-	}
-	return
-}
-
-func (content ModelContent) ToModelSchemas() (output ModelSchemas) {
-	modelInfoArr := content.ToModelInfoArr()
+type ModelInfos []ModelInfo
 
+// to render model schemas
+func (modelInfos ModelInfos) ToModelSchemas() (output ModelSchemas) {
 	output = make(ModelSchemas, 0)
-	for i, value := range modelInfoArr {
+	for i, value := range modelInfos {
 		if i == 0 && !value.IsPrimaryKey() {
 			inputType, goType, mysqlType, ormTag := getModelType("auto")
 			output = append(output, &ModelSchema{

internal/app/module/beegopro/schema_mysql_model.go

@@ -0,0 +1,74 @@
+package beegopro
+
+import (
+	"database/sql"
+	"errors"
+	"github.com/beego/bee/logger"
+)
+
+type TableSchema struct {
+	TableName              string
+	ColumnName             string
+	IsNullable             string
+	DataType               string
+	CharacterMaximumLength sql.NullInt64
+	NumericPrecision       sql.NullInt64
+	NumericScale           sql.NullInt64
+	ColumnType             string
+	ColumnKey              string
+	Comment                string
+}
+
+type TableSchemas []TableSchema
+
+func (tableSchemas TableSchemas) ToTableMap() (resp map[string]ModelInfos) {
+
+	resp = make(map[string]ModelInfos)
+	for _, value := range tableSchemas {
+		if _, ok := resp[value.TableName]; !ok {
+			resp[value.TableName] = make(ModelInfos, 0)
+		}
+
+		modelInfos := resp[value.TableName]
+		inputType, goType, err := value.ToGoType()
+		if err != nil {
+			beeLogger.Log.Fatalf("parse go type err %s", err)
+			return
+		}
+
+		modelInfo := ModelInfo{
+			Name:      value.ColumnName,
+			InputType: inputType,
+			GoType:    goType,
+			Comment:   value.Comment,
+		}
+
+		if value.ColumnKey == "PRI" {
+			modelInfo.Orm = "pk"
+		}
+		resp[value.TableName] = append(modelInfos, modelInfo)
+	}
+	return
+}
+
+// GetGoDataType maps an SQL data type to Golang data type
+func (col TableSchema) ToGoType() (inputType string, goType string, err error) {
+	switch col.DataType {
+	case "char", "varchar", "enum", "set", "text", "longtext", "mediumtext", "tinytext":
+		goType = "string"
+	case "blob", "mediumblob", "longblob", "varbinary", "binary":
+		goType = "[]byte"
+	case "date", "time", "datetime", "timestamp":
+		goType, inputType = "time.Time", "dateTime"
+	case "tinyint", "smallint", "int", "mediumint":
+		goType = "int"
+	case "bit", "bigint":
+		goType = "int64"
+	case "float", "decimal", "double":
+		goType = "float64"
+	}
+	if goType == "" {
+		err = errors.New("No compatible datatype (" + col.DataType + ", CamelName: " + col.ColumnName + ")  found")
+	}
+	return
+}

internal/app/module/beegopro/schema_render.go

@@ -0,0 +1,11 @@
+package beegopro
+
+type RenderInfo struct {
+	Module       string
+	ModelName    string
+	Option       UserOption
+	Content      ModelInfos
+	Descriptor   Descriptor
+	TmplPath     string
+	GenerateTime string
+}

internal/app/module/beegopro/schema_text_model.go

@@ -0,0 +1,50 @@
+package beegopro
+
+import (
+	beeLogger "github.com/beego/bee/logger"
+)
+
+type TextModel struct {
+	Names    []string
+	Orms     []string
+	Comments []string
+	Extends  []string
+}
+
+func (content TextModel) ToModelInfos() (output []ModelInfo) {
+	namesLen := len(content.Names)
+	ormsLen := len(content.Orms)
+	commentsLen := len(content.Comments)
+	if namesLen != ormsLen && namesLen != commentsLen {
+		beeLogger.Log.Fatalf("length error, namesLen is %d, ormsLen is %d, commentsLen is %d", namesLen, ormsLen, commentsLen)
+	}
+	extendLen := len(content.Extends)
+	if extendLen != 0 && extendLen != namesLen {
+		beeLogger.Log.Fatalf("extend length error, namesLen is %d, extendsLen is %d", namesLen, extendLen)
+	}
+
+	output = make([]ModelInfo, 0)
+	for i, name := range content.Names {
+		comment := content.Comments[i]
+		if comment == "" {
+			comment = name
+		}
+		inputType, goType, mysqlType, ormTag := getModelType(content.Orms[i])
+
+		m := ModelInfo{
+			Name:      name,
+			InputType: inputType,
+			GoType:    goType,
+			Orm:       ormTag,
+			Comment:   comment,
+			MysqlType: mysqlType,
+			Extend:    "",
+		}
+		// extend value
+		if extendLen != 0 {
+			m.Extend = content.Extends[i]
+		}
+		output = append(output, m)
+	}
+	return
+}

internal/pkg/git/repository.go

@@ -12,7 +12,7 @@ import (
 	"strings"
 )
 
-// 获取某项目代码库的标签列表
+// git tag
 func GetTags(repoPath string, limit int) ([]string, error) {
 	repo, err := OpenRepository(repoPath)
 	if err != nil {
@@ -57,13 +57,6 @@ func CloneORPullRepo(url string, dst string) error {
 	if !utils.IsDir(dst) {
 		return CloneRepo(url, dst)
 	} else {
-		//projectName, err := getGitProjectName(url)
-		//if err != nil {
-		//	return err
-		//}
-
-		//fmt.Println("dst------>", dst)
-		//projectDir := dst + "/" + projectName
 		utils.Mkdir(dst)
 
 		repo, err := OpenRepository(dst)

internal/pkg/utils/dsn.go

@@ -0,0 +1,113 @@
+package utils
+
+import (
+	"errors"
+	"net/url"
+	"strings"
+)
+
+// DSN ...
+type DSN struct {
+	User   string            // Username
+	Passwd string            // Password (requires User)
+	Net    string            // Network type
+	Addr   string            // Network address (requires Net)
+	DBName string            // Database name
+	Params map[string]string // Connection parameters
+}
+
+var (
+	errInvalidDSNUnescaped = errors.New("invalid DSN: did you forget to escape a param value?")
+	errInvalidDSNAddr      = errors.New("invalid DSN: network address not terminated (missing closing brace)")
+	errInvalidDSNNoSlash   = errors.New("invalid DSN: missing the slash separating the database name")
+)
+
+// ParseDSN parses the DSN string to a Config
+func ParseDSN(dsn string) (cfg *DSN, err error) {
+	// New config with some default values
+	cfg = new(DSN)
+
+	// [user[:password]@][net[(addr)]]/dbname[?param1=value1&paramN=valueN]
+	// Find the last '/' (since the password or the net addr might contain a '/')
+	foundSlash := false
+	for i := len(dsn) - 1; i >= 0; i-- {
+		if dsn[i] == '/' {
+			foundSlash = true
+			var j, k int
+
+			// left part is empty if i <= 0
+			if i > 0 {
+				// [username[:password]@][protocol[(address)]]
+				// Find the last '@' in dsn[:i]
+				for j = i; j >= 0; j-- {
+					if dsn[j] == '@' {
+						// username[:password]
+						// Find the first ':' in dsn[:j]
+						for k = 0; k < j; k++ {
+							if dsn[k] == ':' {
+								cfg.Passwd = dsn[k+1 : j]
+								break
+							}
+						}
+						cfg.User = dsn[:k]
+
+						break
+					}
+				}
+
+				// [protocol[(address)]]
+				// Find the first '(' in dsn[j+1:i]
+				for k = j + 1; k < i; k++ {
+					if dsn[k] == '(' {
+						// dsn[i-1] must be == ')' if an address is specified
+						if dsn[i-1] != ')' {
+							if strings.ContainsRune(dsn[k+1:i], ')') {
+								return nil, errInvalidDSNUnescaped
+							}
+							return nil, errInvalidDSNAddr
+						}
+						cfg.Addr = dsn[k+1 : i-1]
+						break
+					}
+				}
+				cfg.Net = dsn[j+1 : k]
+			}
+
+			// dbname[?param1=value1&...&paramN=valueN]
+			// Find the first '?' in dsn[i+1:]
+			for j = i + 1; j < len(dsn); j++ {
+				if dsn[j] == '?' {
+					if err = parseDSNParams(cfg, dsn[j+1:]); err != nil {
+						return
+					}
+					break
+				}
+			}
+			cfg.DBName = dsn[i+1 : j]
+
+			break
+		}
+	}
+	if !foundSlash && len(dsn) > 0 {
+		return nil, errInvalidDSNNoSlash
+	}
+	return
+}
+
+func parseDSNParams(cfg *DSN, params string) (err error) {
+	for _, v := range strings.Split(params, "&") {
+		param := strings.SplitN(v, "=", 2)
+		if len(param) != 2 {
+			continue
+		}
+		// lazy init
+		if cfg.Params == nil {
+			cfg.Params = make(map[string]string)
+		}
+		value := param[1]
+		if cfg.Params[param[0]], err = url.QueryUnescape(value); err != nil {
+			return
+		}
+	}
+	return
+}