support sqlite3

builder/select.go

@@ -0,0 +1,46 @@
+package builder
+
+// Select 链式操作-查询哪些字段,默认 *
+func (ex *Builder) Select(fields ...string) *Builder {
+	ex.selectList = append(ex.selectList, fields...)
+	return ex
+}
+
+// SelectCount 链式操作-count(field) as field_new
+func (ex *Builder) SelectCount(field string, fieldNew string) *Builder {
+	ex.selectList = append(ex.selectList, "count("+field+") AS "+fieldNew)
+	return ex
+}
+
+// SelectSum 链式操作-sum(field) as field_new
+func (ex *Builder) SelectSum(field string, fieldNew string) *Builder {
+	ex.selectList = append(ex.selectList, "sum("+field+") AS "+fieldNew)
+	return ex
+}
+
+// SelectMin 链式操作-min(field) as field_new
+func (ex *Builder) SelectMin(field string, fieldNew string) *Builder {
+	ex.selectList = append(ex.selectList, "min("+field+") AS "+fieldNew)
+	return ex
+}
+
+// SelectMax 链式操作-max(field) as field_new
+func (ex *Builder) SelectMax(field string, fieldNew string) *Builder {
+	ex.selectList = append(ex.selectList, "max("+field+") AS "+fieldNew)
+	return ex
+}
+
+// SelectAvg 链式操作-avg(field) as field_new
+func (ex *Builder) SelectAvg(field string, fieldNew string) *Builder {
+	ex.selectList = append(ex.selectList, "avg("+field+") AS "+fieldNew)
+	return ex
+}
+
+// SelectExp 链式操作-表达式
+func (ex *Builder) SelectExp(dbSub **Builder, fieldName string) *Builder {
+	ex.selectExpList = append(ex.selectExpList, &SelectItem{
+		Executor:  dbSub,
+		FieldName: fieldName,
+	})
+	return ex
+}