From a4b55e1a40f79778687211cbdc3804f1b639fe67 Mon Sep 17 00:00:00 2001
From: Gert-Jan Timmer <gjr.timmer@gmail.com>
Date: Tue, 29 May 2018 12:19:46 +0200
Subject: [PATCH] ADD: PRAGMA ignore_check_constraints

---
 README.md  |  1 +
 sqlite3.go | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/README.md b/README.md
index 6b96d67..0277dac 100644
--- a/README.md
+++ b/README.md
@@ -79,6 +79,7 @@ Boolean values can be one of:
 | Case Sensitive LIKE | `_cslike` | `boolean` | For more information see [PRAGMA case_sensitive_like](https://www.sqlite.org/pragma.html#pragma_case_sensitive_like) |
 | Defer Foreign Keys | `_defer_foreign_keys` \| `_defer_fk` | `boolean` | For more information see [PRAGMA defer_foreign_keys](https://www.sqlite.org/pragma.html#pragma_defer_foreign_keys) |
 | Foreign Keys | `_foreign_keys` \| `_fk` | `boolean` | For more information see [PRAGMA foreign_keys](https://www.sqlite.org/pragma.html#pragma_foreign_keys) |
+| Ignore CHECK Constraints | `_ignore_check_constraints` | `boolean` | For more information see [PRAGMA ignore_check_constraints](https://www.sqlite.org/pragma.html#pragma_ignore_check_constraints) |
 | Mutex Locking | `_mutex` | <ul><li>no</li><li>full</li></ul> | Specify mutex mode. |
 | Recursive Triggers | `_recursive_triggers` \| `_rt` | `boolean` | For more information see [PRAGMA recursive_triggers](https://www.sqlite.org/pragma.html#pragma_recursive_triggers) |
 | Shared-Cache Mode | `cache` | <ul><li>shared</li><li>private</li></ul> | Set cache mode for more information see [sqlite.org](https://www.sqlite.org/sharedcache.html) |
diff --git a/sqlite3.go b/sqlite3.go
index 56f26c1..dc8f373 100644
--- a/sqlite3.go
+++ b/sqlite3.go
@@ -816,6 +816,10 @@ func errorString(err Error) string {
 //   _foreign_keys=Boolean | _fk=Boolean
 //     Enable or disable enforcement of foreign keys.
 //
+//   _ignore_check_constraints=Boolean
+//     This pragma enables or disables the enforcement of CHECK constraints.
+//     The default setting is off, meaning that CHECK constraints are enforced by default.
+//
 //   _recursive_triggers=Boolean | _rt=Boolean
 //     Enable or disable recursive triggers.
 //
@@ -840,6 +844,7 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
 	busyTimeout := 5000
 	caseSensitiveLike := -1
 	deferForeignKeys := -1
+	ignoreCheckConstraints := -1
 	foreignKeys := -1
 	recursiveTriggers := -1
 
@@ -983,6 +988,21 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
 			}
 		}
 
+		// Ignore CHECK Constrains (_ignore_check_constraints)
+		//
+		// https://www.sqlite.org/pragma.html#pragma_ignore_check_constraints
+		//
+		if val := params.Get("_ignore_check_constraints"); val != "" {
+			switch strings.ToLower(val) {
+			case "0", "no", "false", "off":
+				ignoreCheckConstraints = 0
+			case "1", "yes", "true", "on":
+				ignoreCheckConstraints = 1
+			default:
+				return nil, fmt.Errorf("Invalid _ignore_check_constraints: %v, expecting boolean value of '0 1 false true no yes off on'", val)
+			}
+		}
+
 		// Recursive Triggers (_recursive_triggers)
 		//
 		// https://www.sqlite.org/pragma.html#pragma_recursive_triggers
@@ -1071,6 +1091,14 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
 		}
 	}
 
+	// Ignore CHECK Constraints
+	if ignoreCheckConstraints > -1 {
+		if err := exec(fmt.Sprintf("PRAGMA ignore_check_constraints = %d;", ignoreCheckConstraints)); err != nil {
+			C.sqlite3_close_v2(db)
+			return nil, err
+		}
+	}
+
 	// Recursive Triggers
 	if recursiveTriggers > -1 {
 		if err := exec(fmt.Sprintf("PRAGMA recursive_triggers = %d;", recursiveTriggers)); err != nil {