/
db.go
270 lines (209 loc) · 4.52 KB
/
db.go
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package util
import (
"database/sql"
"fmt"
"strings"
"github.com/project-flogo/core/data/coerce"
_ "github.com/lib/pq" //required if postgres driver is selected
)
type DbType int8
type BindType int8
const (
BtUnknown BindType = iota
BtAt
BtColon
BtDollar
BtQuestion
DbUnknown DbType = iota
DbMySql
DbOracle
DbPostgres
DbSQLite
DbSqlServer
)
// ToTypeEnum get the data type that corresponds to the specified name
func ToDbType(typeStr string) (DbType, error) {
switch strings.ToLower(typeStr) {
case "mysql":
return DbMySql, nil
case "oracle":
return DbOracle, nil
case "postgres":
return DbPostgres, nil
case "sqlite":
return DbSQLite, nil
case "sqlserver":
return DbSqlServer, nil
default:
return DbUnknown, fmt.Errorf("unknown type: %s", typeStr)
}
}
type DbHelper interface {
DbType() DbType
BindType() BindType
ToSQLStatementVal(val interface{}) string
GetScanType(columnType *sql.ColumnType) interface{}
}
func GetDbHelper(typeStr string) (DbHelper, error) {
dbType, err := ToDbType(typeStr)
if err != nil {
return nil, err
}
switch dbType {
case DbMySql:
return &mySqlDBHelper{}, nil
case DbOracle:
return &oracleDBHelper{}, nil
case DbPostgres:
return &postgresDBHelper{}, nil
case DbSQLite:
return &sqliteDBHelper{}, nil
case DbSqlServer:
return &sqlserverDBHelper{}, nil
}
return nil, fmt.Errorf("unsupported db: %s", typeStr)
}
///////////////////////////
// MySQL
type mySqlDBHelper struct {
}
func (*mySqlDBHelper) DbType() DbType {
return DbMySql
}
func (*mySqlDBHelper) BindType() BindType {
return BtQuestion
}
func (*mySqlDBHelper) ToSQLStatementVal(val interface{}) string {
return toSQLStatementVal(val)
}
func (*mySqlDBHelper) GetScanType(columnType *sql.ColumnType) interface{} {
if strings.HasPrefix(columnType.DatabaseTypeName(), "VARCHAR") {
return new(string)
}
return new(interface{})
}
///////////////////////////
// Oracle
type oracleDBHelper struct {
}
func (*oracleDBHelper) DbType() DbType {
return DbMySql
}
func (*oracleDBHelper) BindType() BindType {
return BtColon
}
func (*oracleDBHelper) ToSQLStatementVal(val interface{}) string {
switch t := val.(type) {
case bool:
if t {
return "1"
} else {
return "0"
}
}
return toSQLStatementVal(val)
}
func (*oracleDBHelper) GetScanType(columnType *sql.ColumnType) interface{} {
if strings.HasPrefix(columnType.DatabaseTypeName(), "VARCHAR") {
return new(string)
}
return new(interface{})
}
///////////////////////////
// Postgres
type postgresDBHelper struct {
}
func (*postgresDBHelper) DbType() DbType {
return DbPostgres
}
func (*postgresDBHelper) BindType() BindType {
return BtDollar
}
func (*postgresDBHelper) ToSQLStatementVal(val interface{}) string {
switch t := val.(type) {
case bool:
if t {
return "TRUE"
} else {
return "FALSE"
}
}
return toSQLStatementVal(val)
}
func (*postgresDBHelper) GetScanType(columnType *sql.ColumnType) interface{} {
if strings.HasPrefix(columnType.DatabaseTypeName(), "VARCHAR") {
return new(string)
}
return new(interface{})
}
///////////////////////////
// SQLite
type sqliteDBHelper struct {
}
func (*sqliteDBHelper) DbType() DbType {
return DbMySql
}
func (*sqliteDBHelper) BindType() BindType {
return BtQuestion
}
func (*sqliteDBHelper) ToSQLStatementVal(val interface{}) string {
switch t := val.(type) {
case bool:
if t {
return "1"
} else {
return "0"
}
}
return toSQLStatementVal(val)
}
func (*sqliteDBHelper) GetScanType(columnType *sql.ColumnType) interface{} {
if strings.HasPrefix(columnType.DatabaseTypeName(), "VARCHAR") {
return new(string)
}
return new(interface{})
}
///////////////////////////
// SQLServer
type sqlserverDBHelper struct {
}
func (*sqlserverDBHelper) DbType() DbType {
return DbSqlServer
}
func (*sqlserverDBHelper) BindType() BindType {
return BtAt
}
func (*sqlserverDBHelper) ToSQLStatementVal(val interface{}) string {
switch t := val.(type) {
case bool:
if t {
return "TRUE"
} else {
return "FALSE"
}
}
return toSQLStatementVal(val)
}
func (*sqlserverDBHelper) GetScanType(columnType *sql.ColumnType) interface{} {
if strings.HasPrefix(columnType.DatabaseTypeName(), "VARCHAR") {
return new(string)
}
return new(interface{})
}
////////////////
func toSQLStatementVal(val interface{}) string {
switch t := val.(type) {
case bool:
if t {
return "true"
} else {
return "false"
}
case int, int32, int64, float32, float64:
s, _ := coerce.ToString(val)
return s
default:
s, _ := coerce.ToString(val)
return "'" + s + "'"
}
}