a lot of work on database schema and migration setup, postgres now works, every integration test passes for all database types, only token table left to do

pkg/services/sqlstore/migrator/postgres_dialect.go

@@ -0,0 +1,82 @@
+package migrator
+
+import "strconv"
+
+type Postgres struct {
+	BaseDialect
+}
+
+func NewPostgresDialect() *Postgres {
+	d := Postgres{}
+	d.BaseDialect.dialect = &d
+	d.BaseDialect.driverName = POSTGRES
+	return &d
+}
+
+func (db *Postgres) Quote(name string) string {
+	return "\"" + name + "\""
+}
+
+func (db *Postgres) QuoteStr() string {
+	return "\""
+}
+
+func (db *Postgres) AutoIncrStr() string {
+	return ""
+}
+
+func (db *Postgres) SqlType(c *Column) string {
+	var res string
+	switch t := c.Type; t {
+	case DB_TinyInt:
+		res = DB_SmallInt
+		return res
+	case DB_MediumInt, DB_Int, DB_Integer:
+		if c.IsAutoIncrement {
+			return DB_Serial
+		}
+		return DB_Integer
+	case DB_Serial, DB_BigSerial:
+		c.IsAutoIncrement = true
+		c.Nullable = false
+		res = t
+	case DB_Binary, DB_VarBinary:
+		return DB_Bytea
+	case DB_DateTime:
+		res = DB_TimeStamp
+	case DB_TimeStampz:
+		return "timestamp with time zone"
+	case DB_Float:
+		res = DB_Real
+	case DB_TinyText, DB_MediumText, DB_LongText:
+		res = DB_Text
+	case DB_NVarchar:
+		res = DB_Varchar
+	case DB_Uuid:
+		res = DB_Uuid
+	case DB_Blob, DB_TinyBlob, DB_MediumBlob, DB_LongBlob:
+		return DB_Bytea
+	case DB_Double:
+		return "DOUBLE PRECISION"
+	default:
+		if c.IsAutoIncrement {
+			return DB_Serial
+		}
+		res = t
+	}
+
+	var hasLen1 bool = (c.Length > 0)
+	var hasLen2 bool = (c.Length2 > 0)
+	if hasLen2 {
+		res += "(" + strconv.Itoa(c.Length) + "," + strconv.Itoa(c.Length2) + ")"
+	} else if hasLen1 {
+		res += "(" + strconv.Itoa(c.Length) + ")"
+	}
+	return res
+}
+
+func (db *Postgres) TableCheckSql(tableName string) (string, []interface{}) {
+	args := []interface{}{"grafana", tableName}
+	sql := "SELECT `TABLE_NAME` from `INFORMATION_SCHEMA`.`TABLES` WHERE `TABLE_SCHEMA`=? and `TABLE_NAME`=?"
+	return sql, args
+}