diff --git a/error.go b/error.go
index 2537a55..52017bf 100644
--- a/error.go
+++ b/error.go
@@ -4,51 +4,120 @@ import "C"
 
 type ErrNo int
 
+const ErrNoMask C.int = 0xff
+
+type ErrNoExtended int
+
 type Error struct {
-	Code ErrNo  /* The error code returned by SQLite */
-	err  string /* The error string returned by sqlite3_errmsg(),
+	Code         ErrNo         /* The error code returned by SQLite */
+	ExtendedCode ErrNoExtended /* The extended error code returned by SQLite */
+	err          string        /* The error string returned by sqlite3_errmsg(),
 	this usually contains more specific details. */
 }
 
 // result codes from http://www.sqlite.org/c3ref/c_abort.html
 var (
-	ErrError      error = ErrNo(1)  /* SQL error or missing database */
-	ErrInternal   error = ErrNo(2)  /* Internal logic error in SQLite */
-	ErrPerm       error = ErrNo(3)  /* Access permission denied */
-	ErrAbort      error = ErrNo(4)  /* Callback routine requested an abort */
-	ErrBusy       error = ErrNo(5)  /* The database file is locked */
-	ErrLocked     error = ErrNo(6)  /* A table in the database is locked */
-	ErrNomem      error = ErrNo(7)  /* A malloc() failed */
-	ErrReadonly   error = ErrNo(8)  /* Attempt to write a readonly database */
-	ErrInterrupt  error = ErrNo(9)  /* Operation terminated by sqlite3_interrupt() */
-	ErrIoErr      error = ErrNo(10) /* Some kind of disk I/O error occurred */
-	ErrCorrupt    error = ErrNo(11) /* The database disk image is malformed */
-	ErrNotFound   error = ErrNo(12) /* Unknown opcode in sqlite3_file_control() */
-	ErrFull       error = ErrNo(13) /* Insertion failed because database is full */
-	ErrCantOpen   error = ErrNo(14) /* Unable to open the database file */
-	ErrProtocol   error = ErrNo(15) /* Database lock protocol error */
-	ErrEmpty      error = ErrNo(16) /* Database is empty */
-	ErrSchema     error = ErrNo(17) /* The database schema changed */
-	ErrTooBig     error = ErrNo(18) /* String or BLOB exceeds size limit */
-	ErrConstraint error = ErrNo(19) /* Abort due to constraint violation */
-	ErrMismatch   error = ErrNo(20) /* Data type mismatch */
-	ErrMisuse     error = ErrNo(21) /* Library used incorrectly */
-	ErrNoLFS      error = ErrNo(22) /* Uses OS features not supported on host */
-	ErrAuth       error = ErrNo(23) /* Authorization denied */
-	ErrFormat     error = ErrNo(24) /* Auxiliary database format error */
-	ErrRange      error = ErrNo(25) /* 2nd parameter to sqlite3_bind out of range */
-	ErrNotADB     error = ErrNo(26) /* File opened that is not a database file */
-	ErrNotice     error = ErrNo(27) /* Notifications from sqlite3_log() */
-	ErrWarning    error = ErrNo(28) /* Warnings from sqlite3_log() */
+	ErrError      = ErrNo(1)  /* SQL error or missing database */
+	ErrInternal   = ErrNo(2)  /* Internal logic error in SQLite */
+	ErrPerm       = ErrNo(3)  /* Access permission denied */
+	ErrAbort      = ErrNo(4)  /* Callback routine requested an abort */
+	ErrBusy       = ErrNo(5)  /* The database file is locked */
+	ErrLocked     = ErrNo(6)  /* A table in the database is locked */
+	ErrNomem      = ErrNo(7)  /* A malloc() failed */
+	ErrReadonly   = ErrNo(8)  /* Attempt to write a readonly database */
+	ErrInterrupt  = ErrNo(9)  /* Operation terminated by sqlite3_interrupt() */
+	ErrIoErr      = ErrNo(10) /* Some kind of disk I/O error occurred */
+	ErrCorrupt    = ErrNo(11) /* The database disk image is malformed */
+	ErrNotFound   = ErrNo(12) /* Unknown opcode in sqlite3_file_control() */
+	ErrFull       = ErrNo(13) /* Insertion failed because database is full */
+	ErrCantOpen   = ErrNo(14) /* Unable to open the database file */
+	ErrProtocol   = ErrNo(15) /* Database lock protocol error */
+	ErrEmpty      = ErrNo(16) /* Database is empty */
+	ErrSchema     = ErrNo(17) /* The database schema changed */
+	ErrTooBig     = ErrNo(18) /* String or BLOB exceeds size limit */
+	ErrConstraint = ErrNo(19) /* Abort due to constraint violation */
+	ErrMismatch   = ErrNo(20) /* Data type mismatch */
+	ErrMisuse     = ErrNo(21) /* Library used incorrectly */
+	ErrNoLFS      = ErrNo(22) /* Uses OS features not supported on host */
+	ErrAuth       = ErrNo(23) /* Authorization denied */
+	ErrFormat     = ErrNo(24) /* Auxiliary database format error */
+	ErrRange      = ErrNo(25) /* 2nd parameter to sqlite3_bind out of range */
+	ErrNotADB     = ErrNo(26) /* File opened that is not a database file */
+	ErrNotice     = ErrNo(27) /* Notifications from sqlite3_log() */
+	ErrWarning    = ErrNo(28) /* Warnings from sqlite3_log() */
 )
 
 func (err ErrNo) Error() string {
 	return Error{Code: err}.Error()
 }
 
+func (err ErrNo) Extend(by int) ErrNoExtended {
+	return ErrNoExtended(int(err) | (by << 8))
+}
+
+func (err ErrNoExtended) Error() string {
+	return Error{Code: ErrNo(C.int(err) & ErrNoMask), ExtendedCode: err}.Error()
+}
+
 func (err Error) Error() string {
 	if err.err != "" {
 		return err.err
 	}
 	return errorString(err)
 }
+
+// result codes from http://www.sqlite.org/c3ref/c_abort_rollback.html
+var (
+	ErrIoErrRead              = ErrIoErr.Extend(1)
+	ErrIoErrShortRead         = ErrIoErr.Extend(2)
+	ErrIoErrWrite             = ErrIoErr.Extend(3)
+	ErrIoErrFsync             = ErrIoErr.Extend(4)
+	ErrIoErrDirFsync          = ErrIoErr.Extend(5)
+	ErrIoErrTruncate          = ErrIoErr.Extend(6)
+	ErrIoErrFstat             = ErrIoErr.Extend(7)
+	ErrIoErrUnlock            = ErrIoErr.Extend(8)
+	ErrIoErrRDlock            = ErrIoErr.Extend(9)
+	ErrIoErrDelete            = ErrIoErr.Extend(10)
+	ErrIoErrBlocked           = ErrIoErr.Extend(11)
+	ErrIoErrNoMem             = ErrIoErr.Extend(12)
+	ErrIoErrAccess            = ErrIoErr.Extend(13)
+	ErrIoErrCheckReservedLock = ErrIoErr.Extend(14)
+	ErrIoErrLock              = ErrIoErr.Extend(15)
+	ErrIoErrClose             = ErrIoErr.Extend(16)
+	ErrIoErrDirClose          = ErrIoErr.Extend(17)
+	ErrIoErrSHMOpen           = ErrIoErr.Extend(18)
+	ErrIoErrSHMSize           = ErrIoErr.Extend(19)
+	ErrIoErrSHMLock           = ErrIoErr.Extend(20)
+	ErrIoErrSHMMap            = ErrIoErr.Extend(21)
+	ErrIoErrSeek              = ErrIoErr.Extend(22)
+	ErrIoErrDeleteNoent       = ErrIoErr.Extend(23)
+	ErrIoErrMMap              = ErrIoErr.Extend(24)
+	ErrIoErrGetTempPath       = ErrIoErr.Extend(25)
+	ErrIoErrConvPath          = ErrIoErr.Extend(26)
+	ErrLockedSharedCache      = ErrLocked.Extend(1)
+	ErrBusyRecovery           = ErrBusy.Extend(1)
+	ErrBusySnapshot           = ErrBusy.Extend(2)
+	ErrCantOpenNoTempDir      = ErrCantOpen.Extend(1)
+	ErrCantOpenIsDir          = ErrCantOpen.Extend(2)
+	ErrCantOpenFullPath       = ErrCantOpen.Extend(3)
+	ErrCantOpenConvPath       = ErrCantOpen.Extend(4)
+	ErrCorruptVTab            = ErrCorrupt.Extend(1)
+	ErrReadonlyRecovery       = ErrReadonly.Extend(1)
+	ErrReadonlyCantLock       = ErrReadonly.Extend(2)
+	ErrReadonlyRollback       = ErrReadonly.Extend(3)
+	ErrReadonlyDbMoved        = ErrReadonly.Extend(4)
+	ErrAbortRollback          = ErrAbort.Extend(2)
+	ErrConstraintCheck        = ErrConstraint.Extend(1)
+	ErrConstraintCommitHook   = ErrConstraint.Extend(2)
+	ErrConstraintForeignKey   = ErrConstraint.Extend(3)
+	ErrConstraintFunction     = ErrConstraint.Extend(4)
+	ErrConstraintNotNull      = ErrConstraint.Extend(5)
+	ErrConstraintPrimaryKey   = ErrConstraint.Extend(6)
+	ErrConstraintTrigger      = ErrConstraint.Extend(7)
+	ErrConstraintUnique       = ErrConstraint.Extend(8)
+	ErrConstraintVTab         = ErrConstraint.Extend(9)
+	ErrConstraintRowId        = ErrConstraint.Extend(10)
+	ErrNoticeRecoverWAL       = ErrNotice.Extend(1)
+	ErrNoticeRecoverRollback  = ErrNotice.Extend(2)
+	ErrWarningAutoIndex       = ErrWarning.Extend(1)
+)
diff --git a/error_test.go b/error_test.go
index a47025a..e21f215 100644
--- a/error_test.go
+++ b/error_test.go
@@ -57,15 +57,175 @@ func TestSqlLogicErrors(t *testing.T) {
 	if err != nil {
 		t.Error(err)
 	}
+	defer db.Close()
 
-	_, err = db.Exec("CREATE TABLE Foo (id INT PRIMARY KEY)")
+	_, err = db.Exec("CREATE TABLE Foo (id INTEGER PRIMARY KEY)")
 	if err != nil {
 		t.Error(err)
 	}
 
 	const expectedErr = "table Foo already exists"
-	_, err = db.Exec("CREATE TABLE Foo (id INT PRIMARY KEY)")
+	_, err = db.Exec("CREATE TABLE Foo (id INTEGER PRIMARY KEY)")
 	if err.Error() != expectedErr {
 		t.Errorf("Unexpected error: %s, expected %s", err.Error(), expectedErr)
 	}
+
+}
+
+func TestExtendedErrorCodes_ForeignKey(t *testing.T) {
+	dirName, err := ioutil.TempDir("", "sqlite3-err")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(dirName)
+
+	dbFileName := path.Join(dirName, "test.db")
+	db, err := sql.Open("sqlite3", dbFileName)
+	if err != nil {
+		t.Error(err)
+	}
+	defer db.Close()
+
+	_, err = db.Exec("PRAGMA foreign_keys=ON;")
+	if err != nil {
+		t.Errorf("PRAGMA foreign_keys=ON: %v", err)
+	}
+
+	_, err = db.Exec(`CREATE TABLE Foo (
+		id INTEGER PRIMARY KEY AUTOINCREMENT,
+		value INTEGER NOT NULL,
+		ref INTEGER NULL REFERENCES Foo (id),
+		UNIQUE(value)
+	);`)
+	if err != nil {
+		t.Error(err)
+	}
+
+	_, err = db.Exec("INSERT INTO Foo (ref, value) VALUES (100, 100);")
+	if err == nil {
+		t.Error("No error!")
+	} else {
+		sqliteErr := err.(Error)
+		if sqliteErr.Code != ErrConstraint {
+			t.Errorf("Wrong basic error code: %d != %d",
+				sqliteErr.Code, ErrConstraint)
+		}
+		if sqliteErr.ExtendedCode != ErrConstraintForeignKey {
+			t.Errorf("Wrong extended error code: %d != %d",
+				sqliteErr.ExtendedCode, ErrConstraintForeignKey)
+		}
+	}
+
+}
+
+func TestExtendedErrorCodes_NotNull(t *testing.T) {
+	dirName, err := ioutil.TempDir("", "sqlite3-err")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(dirName)
+
+	dbFileName := path.Join(dirName, "test.db")
+	db, err := sql.Open("sqlite3", dbFileName)
+	if err != nil {
+		t.Error(err)
+	}
+	defer db.Close()
+
+	_, err = db.Exec("PRAGMA foreign_keys=ON;")
+	if err != nil {
+		t.Errorf("PRAGMA foreign_keys=ON: %v", err)
+	}
+
+	_, err = db.Exec(`CREATE TABLE Foo (
+		id INTEGER PRIMARY KEY AUTOINCREMENT,
+		value INTEGER NOT NULL,
+		ref INTEGER NULL REFERENCES Foo (id),
+		UNIQUE(value)
+	);`)
+	if err != nil {
+		t.Error(err)
+	}
+
+	res, err := db.Exec("INSERT INTO Foo (value) VALUES (100);")
+	if err != nil {
+		t.Fatalf("Creating first row: %v", err)
+	}
+
+	id, err := res.LastInsertId()
+	if err != nil {
+		t.Fatalf("Retrieving last insert id: %v", err)
+	}
+
+	_, err = db.Exec("INSERT INTO Foo (ref) VALUES (?);", id)
+	if err == nil {
+		t.Error("No error!")
+	} else {
+		sqliteErr := err.(Error)
+		if sqliteErr.Code != ErrConstraint {
+			t.Errorf("Wrong basic error code: %d != %d",
+				sqliteErr.Code, ErrConstraint)
+		}
+		if sqliteErr.ExtendedCode != ErrConstraintNotNull {
+			t.Errorf("Wrong extended error code: %d != %d",
+				sqliteErr.ExtendedCode, ErrConstraintNotNull)
+		}
+	}
+
+}
+
+func TestExtendedErrorCodes_Unique(t *testing.T) {
+	dirName, err := ioutil.TempDir("", "sqlite3-err")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(dirName)
+
+	dbFileName := path.Join(dirName, "test.db")
+	db, err := sql.Open("sqlite3", dbFileName)
+	if err != nil {
+		t.Error(err)
+	}
+	defer db.Close()
+
+	_, err = db.Exec("PRAGMA foreign_keys=ON;")
+	if err != nil {
+		t.Errorf("PRAGMA foreign_keys=ON: %v", err)
+	}
+
+	_, err = db.Exec(`CREATE TABLE Foo (
+		id INTEGER PRIMARY KEY AUTOINCREMENT,
+		value INTEGER NOT NULL,
+		ref INTEGER NULL REFERENCES Foo (id),
+		UNIQUE(value)
+	);`)
+	if err != nil {
+		t.Error(err)
+	}
+
+	res, err := db.Exec("INSERT INTO Foo (value) VALUES (100);")
+	if err != nil {
+		t.Fatalf("Creating first row: %v", err)
+	}
+
+	id, err := res.LastInsertId()
+	if err != nil {
+		t.Fatalf("Retrieving last insert id: %v", err)
+	}
+
+	_, err = db.Exec("INSERT INTO Foo (ref, value) VALUES (?, 100);", id)
+	if err == nil {
+		t.Error("No error!")
+	} else {
+		sqliteErr := err.(Error)
+		if sqliteErr.Code != ErrConstraint {
+			t.Errorf("Wrong basic error code: %d != %d",
+				sqliteErr.Code, ErrConstraint)
+		}
+		if sqliteErr.ExtendedCode != ErrConstraintUnique {
+			t.Errorf("Wrong extended error code: %d != %d",
+				sqliteErr.ExtendedCode, ErrConstraintUnique)
+		}
+	}
+
 }
diff --git a/sqlite3.go b/sqlite3.go
index 8df3ef2..3d5110b 100644
--- a/sqlite3.go
+++ b/sqlite3.go
@@ -139,8 +139,10 @@ func (c *SQLiteConn) AutoCommit() bool {
 }
 
 func (c *SQLiteConn) lastError() Error {
-	return Error{Code: ErrNo(C.sqlite3_errcode(c.db)),
-		err: C.GoString(C.sqlite3_errmsg(c.db)),
+	return Error{
+		Code:         ErrNo(C.sqlite3_errcode(c.db)),
+		ExtendedCode: ErrNoExtended(C.sqlite3_extended_errcode(c.db)),
+		err:          C.GoString(C.sqlite3_errmsg(c.db)),
 	}
 }