adding ability to work with sqlite compiled with -DSQLITE_OMIT_DECLTYPE

fix #751

Cargo.toml

@@ -59,6 +59,7 @@ in_gecko = ["modern_sqlite", "libsqlite3-sys/in_gecko"]
 bundled-windows = ["libsqlite3-sys/bundled-windows"]
 # Build bundled sqlite with -fsanitize=address
 with-asan = ["libsqlite3-sys/with-asan"]
+column_decltype = []
 
 # Helper feature for enabling both `bundled` and most non-build-related optional
 # features or dependencies. This is useful for running tests / clippy / etc. New
@@ -71,6 +72,7 @@ bundled-full = [
     "bundled",
     "chrono",
     "collation",
+    "column_decltype",
     "csvtab",
     "extra_check",
     "functions",
@@ -134,7 +136,7 @@ name = "cache"
 harness = false
 
 [package.metadata.docs.rs]
-features = [ "backup", "blob", "chrono", "collation", "functions", "limits", "load_extension", "serde_json", "trace", "url", "vtab", "window", "modern_sqlite" ]
+features = [ "backup", "blob", "chrono", "collation", "functions", "limits", "load_extension", "serde_json", "trace", "url", "vtab", "window", "modern_sqlite", "column_decltype" ]
 all-features = false
 no-default-features = true
 default-target = "x86_64-unknown-linux-gnu"

src/column.rs

@@ -86,6 +86,7 @@ impl Statement<'_> {
     }
 
     /// Returns a slice describing the columns of the result of the query.
+    #[cfg(feature = "column_decltype")]
     pub fn columns(&self) -> Vec<Column> {
         let n = self.column_count();
         let mut cols = Vec::with_capacity(n as usize);
@@ -123,6 +124,7 @@ impl<'stmt> Rows<'stmt> {
     }
 
     /// Returns a slice describing the columns of the Rows.
+    #[cfg(feature = "column_decltype")]
     pub fn columns(&self) -> Option<Vec<Column>> {
         self.stmt.map(Statement::columns)
     }
@@ -150,6 +152,7 @@ impl<'stmt> Row<'stmt> {
     }
 
     /// Returns a slice describing the columns of the Row.
+    #[cfg(feature = "column_decltype")]
     pub fn columns(&self) -> Vec<Column> {
         self.stmt.columns()
     }
@@ -157,11 +160,13 @@ impl<'stmt> Row<'stmt> {
 
 #[cfg(test)]
 mod test {
-    use super::Column;
     use crate::Connection;
 
     #[test]
+    #[cfg(feature = "column_decltype")]
     fn test_columns() {
+        use super::Column;
+
         let db = Connection::open_in_memory().unwrap();
         let query = db.prepare("SELECT * FROM sqlite_master").unwrap();
         let columns = query.columns();

src/raw_statement.rs

@@ -63,6 +63,7 @@ impl RawStatement {
         unsafe { ffi::sqlite3_column_type(self.ptr, idx as c_int) }
     }
 
+    #[cfg(feature = "column_decltype")]
     pub fn column_decltype(&self, idx: usize) -> Option<&CStr> {
         unsafe {
             let decltype = ffi::sqlite3_column_decltype(self.ptr, idx as c_int);