feat: update chunk size for MSSQL data loading and add utility functions for database operations

scripts/mssql-copy-in/types.go

@@ -0,0 +1,52 @@
+package main
+
+type ColumnType struct {
+	name string
+
+	hasMaxLength      bool
+	hasPrecisionScale bool
+
+	userType    string
+	systemType  string
+	unifiedType string
+	nullable    bool
+	maxLength   int64
+	precision   int64
+	scale       int64
+}
+
+func (c *ColumnType) Name() string {
+	return c.name
+}
+
+func (c *ColumnType) UserType() string {
+	return c.userType
+}
+
+func (c *ColumnType) SystemType() string {
+	return c.systemType
+}
+
+func (c *ColumnType) Length() (length int64, ok bool) {
+	return c.maxLength, c.hasMaxLength
+}
+
+func (c *ColumnType) DecimalSize() (precision, scale int64, ok bool) {
+	return c.precision, c.scale, c.hasPrecisionScale
+}
+
+func (c *ColumnType) Nullable() bool {
+	return c.nullable
+}
+
+func (c *ColumnType) Type() string {
+	return c.unifiedType
+}
+
+type MigrationJob struct {
+	Schema     string
+	Table      string
+	PrimaryKey string
+}
+
+type UnknownRowValues = []any