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+/*
+Package sqlite3 provides interface to SQLite3 databases.
+
+This works as a driver for database/sql.
+
+Installation
+
+	go get github.com/mattn/go-sqlite3
+
+# Supported Types
+
+Currently, go-sqlite3 supports the following data types.
+
+	+------------------------------+
+	|go        | sqlite3           |
+	|----------|-------------------|
+	|nil       | null              |
+	|int       | integer           |
+	|int64     | integer           |
+	|float64   | float             |
+	|bool      | integer           |
+	|[]byte    | blob              |
+	|string    | text              |
+	|time.Time | timestamp/datetime|
+	+------------------------------+
+
+# SQLite3 Extension
+
+You can write your own extension module for sqlite3. For example, below is an
+extension for a Regexp matcher operation.
+
+	#include <pcre.h>
+	#include <string.h>
+	#include <stdio.h>
+	#include <sqlite3ext.h>
+
+	SQLITE_EXTENSION_INIT1
+	static void regexp_func(sqlite3_context *context, int argc, sqlite3_value **argv) {
+	  if (argc >= 2) {
+	    const char *target  = (const char *)sqlite3_value_text(argv[1]);
+	    const char *pattern = (const char *)sqlite3_value_text(argv[0]);
+	    const char* errstr = NULL;
+	    int erroff = 0;
+	    int vec[500];
+	    int n, rc;
+	    pcre* re = pcre_compile(pattern, 0, &errstr, &erroff, NULL);
+	    rc = pcre_exec(re, NULL, target, strlen(target), 0, 0, vec, 500);
+	    if (rc <= 0) {
+	      sqlite3_result_error(context, errstr, 0);
+	      return;
+	    }
+	    sqlite3_result_int(context, 1);
+	  }
+	}
+
+	#ifdef _WIN32
+	__declspec(dllexport)
+	#endif
+	int sqlite3_extension_init(sqlite3 *db, char **errmsg,
+	      const sqlite3_api_routines *api) {
+	  SQLITE_EXTENSION_INIT2(api);
+	  return sqlite3_create_function(db, "regexp", 2, SQLITE_UTF8,
+	      (void*)db, regexp_func, NULL, NULL);
+	}
+
+It needs to be built as a so/dll shared library. And you need to register
+the extension module like below.
+
+	sql.Register("sqlite3_with_extensions",
+		&sqlite3.SQLiteDriver{
+			Extensions: []string{
+				"sqlite3_mod_regexp",
+			},
+		})
+
+Then, you can use this extension.
+
+	rows, err := db.Query("select text from mytable where name regexp '^golang'")
+
+# Connection Hook
+
+You can hook and inject your code when the connection is established by setting
+ConnectHook to get the SQLiteConn.
+
+	sql.Register("sqlite3_with_hook_example",
+			&sqlite3.SQLiteDriver{
+					ConnectHook: func(conn *sqlite3.SQLiteConn) error {
+						sqlite3conn = append(sqlite3conn, conn)
+						return nil
+					},
+			})
+
+You can also use database/sql.Conn.Raw (Go >= 1.13):
+
+	conn, err := db.Conn(context.Background())
+	// if err != nil { ... }
+	defer conn.Close()
+	err = conn.Raw(func (driverConn any) error {
+		sqliteConn := driverConn.(*sqlite3.SQLiteConn)
+		// ... use sqliteConn
+	})
+	// if err != nil { ... }
+
+# Go SQlite3 Extensions
+
+If you want to register Go functions as SQLite extension functions
+you can make a custom driver by calling RegisterFunction from
+ConnectHook.
+
+	regex = func(re, s string) (bool, error) {
+		return regexp.MatchString(re, s)
+	}
+	sql.Register("sqlite3_extended",
+			&sqlite3.SQLiteDriver{
+					ConnectHook: func(conn *sqlite3.SQLiteConn) error {
+						return conn.RegisterFunc("regexp", regex, true)
+					},
+			})
+
+You can then use the custom driver by passing its name to sql.Open.
+
+	var i int
+	conn, err := sql.Open("sqlite3_extended", "./foo.db")
+	if err != nil {
+		panic(err)
+	}
+	err = db.QueryRow(`SELECT regexp("foo.*", "seafood")`).Scan(&i)
+	if err != nil {
+		panic(err)
+	}
+
+See the documentation of RegisterFunc for more details.
+*/
+package sqlite3