feat(sqlite): add SQLite type mapping and conversion functions

* Implement SQLiteToCanonicalTypes for type mapping * Add ConvertSQLiteToCanonical and ConvertCanonicalToSQLite functions * Update mapDataType to utilize new conversion logic
2026-05-19 19:26:09 +02:00
parent 80fb49bc5e
commit cb735f0754
6 changed files with 430 additions and 147 deletions
@@ -0,0 +1,156 @@
+package mariadb
+
+import "strings"
+
+// MariaDBToCanonicalTypes maps MariaDB/MySQL type names to canonical types.
+var MariaDBToCanonicalTypes = map[string]string{
+	// Integer types
+	"tinyint":   "int8",
+	"smallint":  "int16",
+	"mediumint": "int",
+	"int":       "int",
+	"integer":   "int",
+	"int2":      "int16",
+	"int4":      "int",
+	"int8":      "int64",
+	"bigint":    "int64",
+	// Boolean (TINYINT(1) alias)
+	"boolean": "bool",
+	"bool":    "bool",
+	"bit":     "bool",
+	// Float types
+	"float":            "float32",
+	"double":           "float64",
+	"real":             "float64",
+	"double precision": "float64",
+	// Decimal types
+	"decimal": "decimal",
+	"numeric": "decimal",
+	"dec":     "decimal",
+	"fixed":   "decimal",
+	// String types
+	"char":       "string",
+	"character":  "string",
+	"varchar":    "string",
+	"nchar":      "string",
+	"nvarchar":   "string",
+	"tinytext":   "text",
+	"text":       "text",
+	"mediumtext": "text",
+	"longtext":   "text",
+	// Binary/blob types
+	"binary":     "bytea",
+	"varbinary":  "bytea",
+	"tinyblob":   "bytea",
+	"blob":       "bytea",
+	"mediumblob": "bytea",
+	"longblob":   "bytea",
+	// Date/time types
+	"date":      "date",
+	"time":      "time",
+	"datetime":  "timestamp",
+	"timestamp": "timestamp",
+	"year":      "int",
+	// Other types
+	"json": "json",
+	"enum": "string",
+	"set":  "string",
+	"uuid": "uuid",
+}
+
+// CanonicalToMariaDBTypes maps canonical types to MariaDB/MySQL types.
+var CanonicalToMariaDBTypes = map[string]string{
+	"bool":        "TINYINT(1)",
+	"int8":        "TINYINT",
+	"int16":       "SMALLINT",
+	"int":         "INT",
+	"int32":       "INT",
+	"int64":       "BIGINT",
+	"uint":        "INT UNSIGNED",
+	"uint8":       "TINYINT UNSIGNED",
+	"uint16":      "SMALLINT UNSIGNED",
+	"uint32":      "INT UNSIGNED",
+	"uint64":      "BIGINT UNSIGNED",
+	"float32":     "FLOAT",
+	"float64":     "DOUBLE",
+	"decimal":     "DECIMAL",
+	"string":      "VARCHAR(255)",
+	"text":        "TEXT",
+	"date":        "DATE",
+	"time":        "TIME",
+	"timestamp":   "DATETIME",
+	"timestamptz": "DATETIME",
+	"uuid":        "CHAR(36)",
+	"json":        "JSON",
+	"jsonb":       "JSON",
+	"bytea":       "BLOB",
+}
+
+// MariaDBTypeSynonyms maps MariaDB/MySQL type aliases to their canonical MariaDB name.
+var MariaDBTypeSynonyms = map[string]string{
+	"integer":          "int",
+	"int2":             "smallint",
+	"int4":             "int",
+	"int8":             "bigint",
+	"double precision": "double",
+	"character":        "char",
+	"dec":              "decimal",
+	"fixed":            "decimal",
+	"numeric":          "decimal",
+	"boolean":          "tinyint",
+	"bool":             "tinyint",
+}
+
+// NormalizeMariaDBType maps a MariaDB/MySQL base type (no dimension parameters)
+// to its canonical MariaDB form. Unknown types are returned as-is (lowercased).
+func NormalizeMariaDBType(baseType string) string {
+	lower := strings.ToLower(strings.TrimSpace(baseType))
+	if canonical, ok := MariaDBTypeSynonyms[lower]; ok {
+		return canonical
+	}
+	return lower
+}
+
+// ConvertMariaDBToCanonical converts a MariaDB/MySQL type name to the canonical type.
+// Strips dimension parameters and normalizes aliases. Defaults to "string".
+func ConvertMariaDBToCanonical(mariadbType string) string {
+	base := strings.ToLower(strings.TrimSpace(mariadbType))
+	if idx := strings.Index(base, "("); idx >= 0 {
+		base = strings.TrimSpace(base[:idx])
+	}
+
+	if canonical, ok := MariaDBToCanonicalTypes[base]; ok {
+		return canonical
+	}
+
+	// Prefix match for composite types (e.g., "unsigned bigint")
+	for key, canonical := range MariaDBToCanonicalTypes {
+		if strings.HasPrefix(base, key) {
+			return canonical
+		}
+	}
+
+	return "string"
+}
+
+// ConvertCanonicalToMariaDB converts a canonical type to a MariaDB/MySQL type.
+// Defaults to VARCHAR(255) for unrecognised types.
+func ConvertCanonicalToMariaDB(canonicalType string) string {
+	lower := strings.ToLower(strings.TrimSpace(canonicalType))
+	if idx := strings.Index(lower, "("); idx >= 0 {
+		lower = strings.TrimSpace(lower[:idx])
+	}
+
+	if mariadbType, ok := CanonicalToMariaDBTypes[lower]; ok {
+		return mariadbType
+	}
+
+	// Prefix fallback
+	for canonical, mariadb := range CanonicalToMariaDBTypes {
+		if strings.HasPrefix(lower, canonical) {
+			return mariadb
+		}
+	}
+
+	return "VARCHAR(255)"
+}