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mysql: connection fixes (#18428)

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Mark aka walkingdevel 2023-06-13 05:49:41 +00:00 committed by GitHub
parent 7f178d4662
commit f634f7b01f
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6 changed files with 104 additions and 96 deletions
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5
examples/database/mysql.v
View File

@ -1,14 +1,13 @@
import db.mysql
fn main() {
mut conn := mysql.Connection{
mut conn := mysql.connect(
host: 'localhost'
port: 3306
username: 'root'
password: ''
dbname: 'mysql'
}
conn.connect()!
)!
res := conn.query('show tables')!
for row in res.rows() {
println(row.vals.join(', '))

10
examples/database/orm.v
View File

@ -102,14 +102,13 @@ fn sqlite3_array() ! {
fn msql_array() ! {
eprintln('------------ ${@METHOD} -----------------')
mut db := mysql.Connection{
mut db := mysql.connect(
host: mysql_host
port: mysql_port
username: mysql_user
password: mysql_pass
dbname: mysql_db
}
db.connect()!
)!
defer {
sql db {
drop table Parent
@ -213,14 +212,13 @@ fn sqlite3() ! {
fn msql() ! {
eprintln('------------ ${@METHOD} -----------------')
mut conn := mysql.Connection{
mut conn := mysql.connect(
host: mysql_host
port: mysql_port
username: mysql_user
password: mysql_pass
dbname: mysql_db
}
conn.connect()!
)!
defer {
conn.query('DROP TABLE IF EXISTS Module') or { eprintln(err) }
conn.query('DROP TABLE IF EXISTS User') or { eprintln(err) }

157
vlib/db/mysql/mysql.v
View File

@ -21,7 +21,12 @@ struct SQLError {
MessageError
}
pub struct Connection {
pub struct DB {
mut:
conn &C.MYSQL = unsafe { nil }
}
pub struct Config {
mut:
conn &C.MYSQL = C.mysql_init(0)
pub mut:
@ -34,27 +39,35 @@ pub mut:
}
// connect attempts to establish a connection to a MySQL server.
pub fn (mut c Connection) connect() !bool {
instance := C.mysql_init(c.conn)
c.conn = C.mysql_real_connect(instance, c.host.str, c.username.str, c.password.str,
c.dbname.str, c.port, 0, c.flag)
if isnil(c.conn) {
c.throw_mysql_error()!
pub fn connect(config Config) !DB {
mut db := DB{
conn: C.mysql_init(0)
}
return true
connection := C.mysql_real_connect(db.conn, config.host.str, config.username.str,
config.password.str, config.dbname.str, config.port, 0, config.flag)
if isnil(connection) {
db.throw_mysql_error()!
}
// Sets `db.conn` after checking for `null`
// because `throw_mysql_error` can't extract an error from a `null` connection,
// and `panic` will be with an empty message.
db.conn = connection
return db
}
// query executes the SQL statement pointed to by the string `q`.
// It cannot be used for statements that contain binary data;
// Use `real_query()` instead.
pub fn (c &Connection) query(q string) !Result {
if C.mysql_query(c.conn, q.str) != 0 {
c.throw_mysql_error()!
pub fn (db &DB) query(q string) !Result {
if C.mysql_query(db.conn, q.str) != 0 {
db.throw_mysql_error()!
}
result := C.mysql_store_result(c.conn)
result := C.mysql_store_result(db.conn)
return Result{result}
}
@ -66,8 +79,8 @@ pub fn (c &Connection) query(q string) !Result {
// without storing it in a temporary table or local buffer,
// mysql_use_result is faster and uses much less memory than C.mysql_store_result().
// You must mysql_free_result() after you are done with the result set.
pub fn (c &Connection) use_result() {
C.mysql_use_result(c.conn)
pub fn (db &DB) use_result() {
C.mysql_use_result(db.conn)
}
// real_query makes an SQL query and receive the results.
@ -75,20 +88,20 @@ pub fn (c &Connection) use_result() {
// (Binary data may contain the `\0` character, which `query()`
// interprets as the end of the statement string). In addition,
// `real_query()` is faster than `query()`.
pub fn (mut c Connection) real_query(q string) !Result {
if C.mysql_real_query(c.conn, q.str, q.len) != 0 {
c.throw_mysql_error()!
pub fn (mut db DB) real_query(q string) !Result {
if C.mysql_real_query(db.conn, q.str, q.len) != 0 {
db.throw_mysql_error()!
}
result := C.mysql_store_result(c.conn)
result := C.mysql_store_result(db.conn)
return Result{result}
}
// select_db causes the database specified by `db` to become
// the default (current) database on the connection specified by mysql.
pub fn (mut c Connection) select_db(dbname string) !bool {
if C.mysql_select_db(c.conn, dbname.str) != 0 {
c.throw_mysql_error()!
pub fn (mut db DB) select_db(dbname string) !bool {
if C.mysql_select_db(db.conn, dbname.str) != 0 {
db.throw_mysql_error()!
}
return true
@ -97,16 +110,16 @@ pub fn (mut c Connection) select_db(dbname string) !bool {
// change_user changes the mysql user for the connection.
// Passing an empty string for the `dbname` parameter, resultsg in only changing
// the user and not changing the default database for the connection.
pub fn (mut c Connection) change_user(username string, password string, dbname string) !bool {
pub fn (mut db DB) change_user(username string, password string, dbname string) !bool {
mut result := true
if dbname != '' {
result = C.mysql_change_user(c.conn, username.str, password.str, dbname.str)
result = C.mysql_change_user(db.conn, username.str, password.str, dbname.str)
} else {
result = C.mysql_change_user(c.conn, username.str, password.str, 0)
result = C.mysql_change_user(db.conn, username.str, password.str, 0)
}
if !result {
c.throw_mysql_error()!
db.throw_mysql_error()!
}
return result
@ -114,28 +127,28 @@ pub fn (mut c Connection) change_user(username string, password string, dbname s
// affected_rows returns the number of rows changed, deleted,
// or inserted by the last statement if it was an `UPDATE`, `DELETE`, or `INSERT`.
pub fn (c &Connection) affected_rows() u64 {
return C.mysql_affected_rows(c.conn)
pub fn (db &DB) affected_rows() u64 {
return C.mysql_affected_rows(db.conn)
}
// autocommit turns on/off the auto-committing mode for the connection.
// When it is on, then each query is committed right away.
pub fn (mut c Connection) autocommit(mode bool) ! {
c.check_connection_is_established()!
result := C.mysql_autocommit(c.conn, mode)
pub fn (mut db DB) autocommit(mode bool) ! {
db.check_connection_is_established()!
result := C.mysql_autocommit(db.conn, mode)
if result != 0 {
c.throw_mysql_error()!
db.throw_mysql_error()!
}
}
// commit commits the current transaction.
pub fn (c &Connection) commit() ! {
c.check_connection_is_established()!
result := C.mysql_commit(c.conn)
pub fn (db &DB) commit() ! {
db.check_connection_is_established()!
result := C.mysql_commit(db.conn)
if result != 0 {
c.throw_mysql_error()!
db.throw_mysql_error()!
}
}
@ -144,10 +157,10 @@ pub fn (c &Connection) commit() ! {
// The `wildcard` parameter may contain the wildcard characters `%` or `_`.
// If an empty string is passed, it will return all tables.
// Calling `tables()` is similar to executing query `SHOW TABLES [LIKE wildcard]`.
pub fn (c &Connection) tables(wildcard string) ![]string {
c_mysql_result := C.mysql_list_tables(c.conn, wildcard.str)
pub fn (db &DB) tables(wildcard string) ![]string {
c_mysql_result := C.mysql_list_tables(db.conn, wildcard.str)
if isnil(c_mysql_result) {
c.throw_mysql_error()!
db.throw_mysql_error()!
}
result := Result{c_mysql_result}
@ -163,10 +176,10 @@ pub fn (c &Connection) tables(wildcard string) ![]string {
// escape_string creates a legal SQL string for use in an SQL statement.
// The `s` argument is encoded to produce an escaped SQL string,
// taking into account the current character set of the connection.
pub fn (c &Connection) escape_string(s string) string {
pub fn (db &DB) escape_string(s string) string {
unsafe {
to := malloc_noscan(2 * s.len + 1)
C.mysql_real_escape_string(c.conn, to, s.str, s.len)
C.mysql_real_escape_string(db.conn, to, s.str, s.len)
return to.vstring()
}
}
@ -174,16 +187,16 @@ pub fn (c &Connection) escape_string(s string) string {
// set_option sets extra connect options that affect the behavior of
// a connection. This function may be called multiple times to set several
// options. To retrieve the current values for an option, use `get_option()`.
pub fn (mut c Connection) set_option(option_type int, val voidptr) {
C.mysql_options(c.conn, option_type, val)
pub fn (mut db DB) set_option(option_type int, val voidptr) {
C.mysql_options(db.conn, option_type, val)
}
// get_option returns the value of an option, settable by `set_option`.
// https://dev.mysql.com/doc/c-api/5.7/en/mysql-get-option.html
pub fn (c &Connection) get_option(option_type int) !voidptr {
pub fn (db &DB) get_option(option_type int) !voidptr {
mysql_option := unsafe { nil }
if C.mysql_get_option(c.conn, option_type, &mysql_option) != 0 {
c.throw_mysql_error()!
if C.mysql_get_option(db.conn, option_type, &mysql_option) != 0 {
db.throw_mysql_error()!
}
return mysql_option
@ -191,18 +204,18 @@ pub fn (c &Connection) get_option(option_type int) !voidptr {
// refresh flush the tables or caches, or resets replication server
// information. The connected user must have the `RELOAD` privilege.
pub fn (mut c Connection) refresh(options u32) !bool {
if C.mysql_refresh(c.conn, options) != 0 {
c.throw_mysql_error()!
pub fn (mut db DB) refresh(options u32) !bool {
if C.mysql_refresh(db.conn, options) != 0 {
db.throw_mysql_error()!
}
return true
}
// reset resets the connection, and clear the session state.
pub fn (mut c Connection) reset() !bool {
if C.mysql_reset_connection(c.conn) != 0 {
c.throw_mysql_error()!
pub fn (mut db DB) reset() !bool {
if C.mysql_reset_connection(db.conn) != 0 {
db.throw_mysql_error()!
}
return true
@ -210,50 +223,50 @@ pub fn (mut c Connection) reset() !bool {
// ping pings a server connection, or tries to reconnect if the connection
// has gone down.
pub fn (mut c Connection) ping() !bool {
if C.mysql_ping(c.conn) != 0 {
c.throw_mysql_error()!
pub fn (mut db DB) ping() !bool {
if C.mysql_ping(db.conn) != 0 {
db.throw_mysql_error()!
}
return true
}
// close closes the connection.
pub fn (mut c Connection) close() {
C.mysql_close(c.conn)
pub fn (mut db DB) close() {
C.mysql_close(db.conn)
}
// info returns information about the most recently executed query.
// See more on https://dev.mysql.com/doc/c-api/8.0/en/mysql-info.html
pub fn (c &Connection) info() string {
return resolve_nil_str(C.mysql_info(c.conn))
pub fn (db &DB) info() string {
return resolve_nil_str(C.mysql_info(db.conn))
}
// get_host_info returns a string describing the type of connection in use,
// including the server host name.
pub fn (c &Connection) get_host_info() string {
return unsafe { C.mysql_get_host_info(c.conn).vstring() }
pub fn (db &DB) get_host_info() string {
return unsafe { C.mysql_get_host_info(db.conn).vstring() }
}
// get_server_info returns a string representing the MySQL server version.
// For example, `8.0.24`.
pub fn (c &Connection) get_server_info() string {
return unsafe { C.mysql_get_server_info(c.conn).vstring() }
pub fn (db &DB) get_server_info() string {
return unsafe { C.mysql_get_server_info(db.conn).vstring() }
}
// get_server_version returns an integer, representing the MySQL server
// version. The value has the format `XYYZZ` where `X` is the major version,
// `YY` is the release level (or minor version), and `ZZ` is the sub-version
// within the release level. For example, `8.0.24` is returned as `80024`.
pub fn (c &Connection) get_server_version() u64 {
return C.mysql_get_server_version(c.conn)
pub fn (db &DB) get_server_version() u64 {
return C.mysql_get_server_version(db.conn)
}
// dump_debug_info instructs the server to write debugging information
// to the error log. The connected user must have the `SUPER` privilege.
pub fn (mut c Connection) dump_debug_info() !bool {
if C.mysql_dump_debug_info(c.conn) != 0 {
c.throw_mysql_error()!
pub fn (mut db DB) dump_debug_info() !bool {
if C.mysql_dump_debug_info(db.conn) != 0 {
db.throw_mysql_error()!
}
return true
@ -278,13 +291,13 @@ pub fn debug(debug string) {
}
[inline]
fn (c &Connection) throw_mysql_error() ! {
return error_with_code(get_error_msg(c.conn), get_errno(c.conn))
fn (db &DB) throw_mysql_error() ! {
return error_with_code(get_error_msg(db.conn), get_errno(db.conn))
}
[inline]
fn (c &Connection) check_connection_is_established() ! {
if isnil(c.conn) {
fn (db &DB) check_connection_is_established() ! {
if isnil(db.conn) {
return error('No connection to a MySQL server, use `connect()` to connect to a database for working with it')
}
}

6
vlib/db/mysql/mysql_orm_test.v
View File

@ -36,14 +36,13 @@ struct TestDefaultAtribute {
}
fn test_mysql_orm() {
mut db := mysql.Connection{
mut db := mysql.connect(
host: 'localhost'
port: 3306
username: 'root'
password: ''
dbname: 'mysql'
}
db.connect() or { panic(err) }
)!
defer {
db.close()
}
@ -124,7 +123,6 @@ fn test_mysql_orm() {
WHERE TABLE_NAME = 'TestCustomSqlType'
ORDER BY ORDINAL_POSITION
") or {
println(err)
panic(err)
}

20
vlib/db/mysql/orm.v
View File

@ -4,7 +4,7 @@ import orm
import time
// @select is used internally by V's ORM for processing `SELECT ` queries.
pub fn (db Connection) @select(config orm.SelectConfig, data orm.QueryData, where orm.QueryData) ![][]orm.Primitive {
pub fn (db DB) @select(config orm.SelectConfig, data orm.QueryData, where orm.QueryData) ![][]orm.Primitive {
query := orm.orm_select_gen(config, '`', false, '?', 0, where)
mut result := [][]orm.Primitive{}
mut stmt := db.init_stmt(query)
@ -128,7 +128,7 @@ pub fn (db Connection) @select(config orm.SelectConfig, data orm.QueryData, wher
}
// insert is used internally by V's ORM for processing `INSERT ` queries
pub fn (db Connection) insert(table string, data orm.QueryData) ! {
pub fn (db DB) insert(table string, data orm.QueryData) ! {
mut converted_primitive_array := db.convert_query_data_to_primitives(table, data)!
converted_primitive_data := orm.QueryData{
@ -145,20 +145,20 @@ pub fn (db Connection) insert(table string, data orm.QueryData) ! {
}
// update is used internally by V's ORM for processing `UPDATE ` queries
pub fn (db Connection) update(table string, data orm.QueryData, where orm.QueryData) ! {
pub fn (db DB) update(table string, data orm.QueryData, where orm.QueryData) ! {
query, _ := orm.orm_stmt_gen(.default, table, '`', .update, false, '?', 1, data, where)
mysql_stmt_worker(db, query, data, where)!
}
// delete is used internally by V's ORM for processing `DELETE ` queries
pub fn (db Connection) delete(table string, where orm.QueryData) ! {
pub fn (db DB) delete(table string, where orm.QueryData) ! {
query, _ := orm.orm_stmt_gen(.default, table, '`', .delete, false, '?', 1, orm.QueryData{},
where)
mysql_stmt_worker(db, query, orm.QueryData{}, where)!
}
// last_id is used internally by V's ORM for post-processing `INSERT ` queries
pub fn (db Connection) last_id() int {
pub fn (db DB) last_id() int {
query := 'SELECT last_insert_id();'
id := db.query(query) or { return 0 }
@ -166,7 +166,7 @@ pub fn (db Connection) last_id() int {
}
// create is used internally by V's ORM for processing table creation queries (DDL)
pub fn (db Connection) create(table string, fields []orm.TableField) ! {
pub fn (db DB) create(table string, fields []orm.TableField) ! {
query := orm.orm_table_gen(table, '`', true, 0, fields, mysql_type_from_v, false) or {
return err
}
@ -174,7 +174,7 @@ pub fn (db Connection) create(table string, fields []orm.TableField) ! {
}
// drop is used internally by V's ORM for processing table destroying queries (DDL)
pub fn (db Connection) drop(table string) ! {
pub fn (db DB) drop(table string) ! {
query := 'DROP TABLE `${table}`;'
mysql_stmt_worker(db, query, orm.QueryData{}, orm.QueryData{})!
}
@ -182,7 +182,7 @@ pub fn (db Connection) drop(table string) ! {
// mysql_stmt_worker executes the `query` with the provided `data` and `where` parameters
// without returning the result.
// This is commonly used for `INSERT`, `UPDATE`, `CREATE`, `DROP`, and `DELETE` queries.
fn mysql_stmt_worker(db Connection, query string, data orm.QueryData, where orm.QueryData) ! {
fn mysql_stmt_worker(db DB, query string, data orm.QueryData, where orm.QueryData) ! {
mut stmt := db.init_stmt(query)
stmt.prepare()!
@ -360,7 +360,7 @@ fn mysql_type_from_v(typ int) !string {
// convert_query_data_to_primitives converts the `data` representing the `QueryData`
// into an array of `Primitive`.
fn (db Connection) convert_query_data_to_primitives(table string, data orm.QueryData) ![]orm.Primitive {
fn (db DB) convert_query_data_to_primitives(table string, data orm.QueryData) ![]orm.Primitive {
mut column_type_map := db.get_table_column_type_map(table)!
mut converted_data := []orm.Primitive{}
@ -381,7 +381,7 @@ fn (db Connection) convert_query_data_to_primitives(table string, data orm.Query
// get_table_column_type_map returns a map where the key represents the column name,
// and the value represents its data type.
fn (db Connection) get_table_column_type_map(table string) !map[string]string {
fn (db DB) get_table_column_type_map(table string) !map[string]string {
data_type_query := "SELECT COLUMN_NAME, DATA_TYPE FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = '${table}'"
mut column_type_map := map[string]string{}
results := db.query(data_type_query)!

2
vlib/db/mysql/stmt.c.v
View File

@ -77,7 +77,7 @@ pub fn (s &Stmt) str() string {
}
// init_stmt creates a new statement, given the `query`.
pub fn (db Connection) init_stmt(query string) Stmt {
pub fn (db DB) init_stmt(query string) Stmt {
return Stmt{
stmt: C.mysql_stmt_init(db.conn)
query: query