Add custom sqlite type names

Author: Xiphoseer

modules/fdb/src/sqlite.rs

@@ -26,6 +26,63 @@ impl<'a> ToSql for Field<'a> {
     }
 }
 
+impl ValueType {
+    /// Get the canonical SQLite name of this data type
+    pub fn to_sqlite_type(self) -> &'static str {
+        match self {
+            ValueType::Nothing => "BLOB_NONE",
+            ValueType::Integer => "INT32",
+            ValueType::Float => "REAL",
+            ValueType::Text => "TEXT4",
+            ValueType::Boolean => "INT_BOOL",
+            ValueType::BigInt => "INT64",
+            ValueType::VarChar => "TEXT_XML",
+        }
+    }
+
+    /// Take an SQLite column declaration type and guess the ValueType
+    ///
+    /// This function does a proper round-trip with `to_sqlite_type`
+    ///
+    /// ```
+    /// use assembly_fdb::common::ValueType;
+    ///
+    /// fn round_trip(v: ValueType) -> Option<ValueType> {
+    ///     ValueType::from_sqlite_type(v.to_sqlite_type())
+    /// }
+    ///
+    /// // Check whether the round-trip works
+    /// assert_eq!(round_trip(ValueType::Nothing), Some(ValueType::Nothing));
+    /// assert_eq!(round_trip(ValueType::Integer), Some(ValueType::Integer));
+    /// assert_eq!(round_trip(ValueType::Float), Some(ValueType::Float));
+    /// assert_eq!(round_trip(ValueType::Text), Some(ValueType::Text));
+    /// assert_eq!(round_trip(ValueType::Boolean), Some(ValueType::Boolean));
+    /// assert_eq!(round_trip(ValueType::BigInt), Some(ValueType::BigInt));
+    /// assert_eq!(round_trip(ValueType::VarChar), Some(ValueType::VarChar));
+    ///
+    /// // Check whether lcdr's names work
+    /// assert_eq!(ValueType::from_sqlite_type("none"), Some(ValueType::Nothing));
+    /// assert_eq!(ValueType::from_sqlite_type("int32"), Some(ValueType::Integer));
+    /// assert_eq!(ValueType::from_sqlite_type("real"), Some(ValueType::Float));
+    /// assert_eq!(ValueType::from_sqlite_type("text_4"), Some(ValueType::Text));
+    /// assert_eq!(ValueType::from_sqlite_type("int_bool"), Some(ValueType::Boolean));
+    /// assert_eq!(ValueType::from_sqlite_type("int64"), Some(ValueType::BigInt));
+    /// assert_eq!(ValueType::from_sqlite_type("text_8"), Some(ValueType::VarChar));
+    /// ```
+    pub fn from_sqlite_type(decl_type: &str) -> Option<Self> {
+        match decl_type {
+            "BLOB_NONE" | "blob_none" | "none" | "NULL" => Some(ValueType::Nothing),
+            "INT32" | "int32" | "TINYINT" | "SMALLINT" => Some(ValueType::Integer),
+            "real" | "REAL" | "FLOAT" => Some(ValueType::Float),
+            "TEXT4" | "text_4" | "TEXT" => Some(ValueType::Text),
+            "BIT" | "INT_BOOL" | "int_bool" => Some(ValueType::Boolean),
+            "INT64" | "int64" | "BIGINT" | "INTEGER" => Some(ValueType::BigInt),
+            "XML" | "TEXT_XML" | "xml" | "text_8" | "text_xml" | "VARCHAR" => Some(ValueType::VarChar),
+            _ => None,
+        }
+    }
+}
+
 /// Try to export a database to a SQL connection
 ///
 /// This function does the following:
@@ -52,15 +109,7 @@ pub fn try_export_db(conn: &mut Connection, db: Database) -> rusqlite::Result<()
                 writeln!(create_query, ",").unwrap();
                 write!(insert_query, ", ").unwrap();
             }
-            let typ = match col.value_type() {
-                ValueType::Nothing => "NULL",
-                ValueType::Integer => "INTEGER",
-                ValueType::Float => "REAL",
-                ValueType::Text => "TEXT",
-                ValueType::Boolean => "INTEGER",
-                ValueType::BigInt => "INTEGER",
-                ValueType::VarChar => "BLOB",
-            };
+            let typ = col.value_type().to_sqlite_type();
             write!(create_query, "    [{}] {}", col.name(), typ).unwrap();
             write!(insert_query, "[{}]", col.name()).unwrap();
         }