Improved name of new function, documentation and tests.

include/SQLiteCpp/Statement.h

@@ -652,10 +652,12 @@ class Statement
      *
      * @param[in] aIndex    Index of the column in the range [0, getColumnCount()).
      * 
-     *  Throw an exception if the specified index is out of the [0, getColumnCount()) range
-     *  or if the current statement is not a SELECT statement.
+     *  Throw an exception if the type can't be determined because:
+     *  - the specified index is out of the [0, getColumnCount()) range
+     *  - the statement is not a SELECT query
+     *  - the column at aIndex is not a table column but an expression or subquery
      */
-    const char * getDeclaredType(const int aIndex) const;
+    const char * getColumnDeclaredType(const int aIndex) const;
 
 
 

src/Statement.cpp

@@ -296,7 +296,7 @@ int Statement::getColumnIndex(const char* apName) const
     return (*iIndex).second;
 }
 
-const char * Statement::getDeclaredType(const int aIndex) const
+const char * Statement::getColumnDeclaredType(const int aIndex) const
 {
     checkIndex(aIndex);
     const char * result = sqlite3_column_decltype(mStmtPtr, aIndex);

tests/Statement_test.cpp

@@ -918,27 +918,30 @@ TEST(Statement, getName)
 #endif
 }
 
-TEST(Statement, getDeclaredType)
+TEST(Statement, getColumnDeclaredType)
 {
     // Create a new database
     SQLite::Database db(":memory:", SQLite::OPEN_READWRITE | SQLite::OPEN_CREATE);
     EXPECT_EQ(0, db.exec("CREATE TABLE test (id INTEGER PRIMARY KEY, msg TEXT, value DOUBLE)"));
-    
-    SQLite::Statement query(db, "SELECT * FROM test");
-    
-    const std::string decltype0 = query.getDeclaredType(0);
-    const std::string decltype1 = query.getDeclaredType(1);
-    const std::string decltype2 = query.getDeclaredType(2);
+
+    SQLite::Statement query(db, "SELECT *, 1 FROM test");
+
+    const std::string decltype0 = query.getColumnDeclaredType(0);
+    const std::string decltype1 = query.getColumnDeclaredType(1);
+    const std::string decltype2 = query.getColumnDeclaredType(2);
     EXPECT_EQ("INTEGER", decltype0);
     EXPECT_EQ("TEXT", decltype1);
     EXPECT_EQ("DOUBLE", decltype2);
 
+    // The column at index 3 is not a table column.
+    EXPECT_THROW(query.getColumnDeclaredType(3), SQLite::Exception);
+
     // Index out of bounds.
-    EXPECT_THROW(query.getDeclaredType(3), SQLite::Exception);
+    EXPECT_THROW(query.getColumnDeclaredType(4), SQLite::Exception);
 
-    // Not a SELECT statement.
-    SQLite::Statement insert(db, "INSERT INTO test VALUES (1, 'Hello', 3.1415)");
-    EXPECT_THROW(insert.getDeclaredType(0), SQLite::Exception);
+    // Not a select statement.
+    SQLite::Statement pragma(db,"PRAGMA compile_options");
+    EXPECT_THROW(pragma.getColumnDeclaredType(0), SQLite::Exception);
 }
 
 #if __cplusplus >= 201402L || (defined(_MSC_VER) && _MSC_VER >= 1900)