Fix missing docs

src/types/from_sql.rs

@@ -86,6 +86,7 @@ pub type FromSqlResult<T> = Result<T, FromSqlError>;
 /// fetching values as i64 and then doing the interpretation themselves or by
 /// defining a newtype and implementing `FromSql`/`ToSql` for it.
 pub trait FromSql: Sized {
+    /// Converts SQLite value into Rust value.
     fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self>;
 }
 

src/types/mod.rs

@@ -82,12 +82,19 @@ mod value_ref;
 #[derive(Copy, Clone)]
 pub struct Null;
 
+/// SQLite data types.
+/// See [Fundamental Datatypes](https://sqlite.org/c3ref/c_blob.html).
 #[derive(Clone, Debug, PartialEq)]
 pub enum Type {
+    /// NULL
     Null,
+    /// 64-bit signed integer
     Integer,
+    /// 64-bit IEEE floating point number
     Real,
+    /// String
     Text,
+    /// BLOB
     Blob,
 }
 

src/types/to_sql.rs

@@ -87,6 +87,7 @@ impl ToSql for ToSqlOutput<'_> {
 
 /// A trait for types that can be converted into SQLite values.
 pub trait ToSql {
+    /// Converts Rust value to SQLite value
     fn to_sql(&self) -> Result<ToSqlOutput<'_>>;
 }
 

src/types/value.rs

@@ -109,6 +109,7 @@ where
 }
 
 impl Value {
+    /// Returns SQLite fundamental datatype.
     pub fn data_type(&self) -> Type {
         match *self {
             Value::Null => Type::Null,

src/types/value_ref.rs

@@ -20,6 +20,7 @@ pub enum ValueRef<'a> {
 }
 
 impl ValueRef<'_> {
+    /// Returns SQLite fundamental datatype.
     pub fn data_type(&self) -> Type {
         match *self {
             ValueRef::Null => Type::Null,