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authorDaniel J Walsh <dwalsh@redhat.com>2018-03-26 18:26:55 -0400
committerAtomic Bot <atomic-devel@projectatomic.io>2018-03-27 18:09:12 +0000
commitaf64e10400f8533a0c48ecdf5ab9b7fbf329e14e (patch)
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Signed-off-by: Daniel J Walsh <dwalsh@redhat.com> Closes: #554 Approved by: mheon
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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. database/sql
-doesn't provide a way to get native go-sqlite3 interfaces. So if you want,
-you need to set ConnectHook and get the SQLiteConn.
-
- sql.Register("sqlite3_with_hook_example",
- &sqlite3.SQLiteDriver{
- ConnectHook: func(conn *sqlite3.SQLiteConn) error {
- sqlite3conn = append(sqlite3conn, conn)
- return nil
- },
- })
-
-Go SQlite3 Extensions
-
-If you want to register Go functions as SQLite extension functions,
-call RegisterFunction from ConnectHook.
-
- regex = func(re, s string) (bool, error) {
- return regexp.MatchString(re, s)
- }
- sql.Register("sqlite3_with_go_func",
- &sqlite3.SQLiteDriver{
- ConnectHook: func(conn *sqlite3.SQLiteConn) error {
- return conn.RegisterFunc("regexp", regex, true)
- },
- })
-
-See the documentation of RegisterFunc for more details.
-
-*/
-package sqlite3