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mysql: add more documentation (#7846)

pull/7987/head^2
Don Alfons Nisnoni 2021-01-09 16:40:21 +08:00 committed by GitHub
parent 256ddcee1f
commit d645e45752
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 192 additions and 173 deletions
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1
examples/database/mysql.v
View File

@ -13,6 +13,5 @@ fn main() {
for row in res.rows() {
println(row.vals.join(', '))
}
res.free()
conn.close()
}

4
vlib/mysql/_cdefs.c.v
View File

@ -17,8 +17,8 @@ struct C.MYSQL_FIELD {
db byteptr // Database for table
catalog byteptr // Catalog for table
def byteptr // Default value (set by mysql_list_fields)
length int // Width of column (create length)
max_length int // Max width for selected set
length int // Width of column (create length)
max_length int // Max width for selected set
name_length u32
org_name_length u32
table_length u32

1
vlib/mysql/_cdefs_nix.c.v
View File

@ -2,4 +2,3 @@ module mysql
#pkgconfig mysqlclient
#include <mysql.h> # Please install the mysqlclient development headers

177
vlib/mysql/mysql.v
View File

@ -1,22 +1,21 @@
module mysql
// Values for the capabilities flag bitmask used by the MySQL protocol.
// See more on https://dev.mysql.com/doc/dev/mysql-server/latest/group__group__cs__capabilities__flags.html#details
pub enum ConnectionFlag {
// CAN_HANDLE_EXPIRED_PASSWORDS = C.CAN_HANDLE_EXPIRED_PASSWORDS
client_compress = C.CLIENT_COMPRESS
client_found_rows = C.CLIENT_FOUND_ROWS
client_ignore_sigpipe = C.CLIENT_IGNORE_SIGPIPE
client_ignore_space = C.CLIENT_IGNORE_SPACE
client_interactive = C.CLIENT_INTERACTIVE
client_local_files = C.CLIENT_LOCAL_FILES
client_multi_results = C.CLIENT_MULTI_RESULTS
client_compress = C.CLIENT_COMPRESS
client_found_rows = C.CLIENT_FOUND_ROWS
client_ignore_sigpipe = C.CLIENT_IGNORE_SIGPIPE
client_ignore_space = C.CLIENT_IGNORE_SPACE
client_interactive = C.CLIENT_INTERACTIVE
client_local_files = C.CLIENT_LOCAL_FILES
client_multi_results = C.CLIENT_MULTI_RESULTS
client_multi_statements = C.CLIENT_MULTI_STATEMENTS
client_no_schema = C.CLIENT_NO_SCHEMA
client_odbc = C.CLIENT_ODBC
client_no_schema = C.CLIENT_NO_SCHEMA
client_odbc = C.CLIENT_ODBC
// client_optional_resultset_metadata = C.CLIENT_OPTIONAL_RESULTSET_METADATA
client_ssl = C.CLIENT_SSL
client_ssl = C.CLIENT_SSL
client_remember_options = C.CLIENT_REMEMBER_OPTIONS
}
@ -26,14 +25,14 @@ mut:
conn &C.MYSQL = C.mysql_init(0)
pub mut:
host string = '127.0.0.1'
port u32 = 3306
port u32 = 3306
username string
password string
dbname string
flag ConnectionFlag
}
// connect connects to a MySQL server.
// connect - create a new connection to the MySQL server.
pub fn (mut conn Connection) connect() ?bool {
instance := C.mysql_init(conn.conn)
conn.conn = C.mysql_real_connect(conn.conn, conn.host.str, conn.username.str, conn.password.str,
@ -44,9 +43,10 @@ pub fn (mut conn Connection) connect() ?bool {
return true
}
// query executes an SQL query.
// `query()` cannot be used for statements that contain binary data; you must use `real_query()` instead.
pub fn (conn Connection) query(q string) ?Result {
// query - make an SQL query and receive the results.
// `query()` cannot be used for statements that contain binary data;
// Use `real_query()` instead.
pub fn (mut conn Connection) query(q string) ?Result {
if C.mysql_query(conn.conn, q.str) != 0 {
return error_with_code(get_error_msg(conn.conn), get_errno(conn.conn))
}
@ -54,11 +54,12 @@ pub fn (conn Connection) query(q string) ?Result {
return Result{res}
}
// real_query executes an SQL query. Same as `query ()`,
// But `real_query ()` can be used for statements containing binary data.
// (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 (conn Connection) real_query(q string) ?Result {
// real_query - make an SQL query and receive the results.
// `real_query()` can be used for statements containing binary data.
// (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 conn Connection) real_query(q string) ?Result {
if C.mysql_real_query(conn.conn, q.str, q.len) != 0 {
return error_with_code(get_error_msg(conn.conn), get_errno(conn.conn))
}
@ -66,18 +67,18 @@ pub fn (conn Connection) real_query(q string) ?Result {
return Result{res}
}
// select_db selects the default database for database queries.
pub fn (conn Connection) select_db(dbname string) ?bool {
// select_db - change the default database for database queries.
pub fn (mut conn Connection) select_db(dbname string) ?bool {
if C.mysql_select_db(conn.conn, dbname.str) != 0 {
return error_with_code(get_error_msg(conn.conn), get_errno(conn.conn))
}
return true
}
// change_user changes the user of the specified database connection.
// if desired, the empty string value can be passed to the `dbname` parameter
// resulting in only changing the user and not selecting a database.
pub fn (conn Connection) change_user(username string, password string, dbname string) ?bool {
// change_user - change 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 conn Connection) change_user(username string, password string, dbname string) ?bool {
mut ret := true
if dbname != '' {
ret = C.mysql_change_user(conn.conn, username.str, password.str, dbname.str)
@ -90,20 +91,24 @@ pub fn (conn Connection) change_user(username string, password string, dbname st
return ret
}
// affected_rows returns the number of rows changed/deleted/inserted
// by the last UPDATE, DELETE, or INSERT query.
pub fn (conn Connection) affected_rows() u64 {
// affected_rows - return the number of rows changed/deleted/inserted
// by the last `UPDATE`, `DELETE`, or `INSERT` query.
pub fn (conn &Connection) affected_rows() u64 {
return C.mysql_affected_rows(conn.conn)
}
// autocommit turns on or off auto-committing database modifications.
pub fn (conn Connection) autocommit(mode bool) {
// autocommit - turns on/off the auto-committing mode for the connection.
// When it is on, then each query is commited right away.
pub fn (mut conn Connection) autocommit(mode bool) {
C.mysql_autocommit(conn.conn, mode)
}
// tables returns list of tables that match the `wildcard` parameter.
// If empty string is passed, will return all tables.
pub fn (conn Connection) tables(wildcard string) ?[]string {
// tables - returns a list of the names of the tables in the current database,
// that match the simple regular expression specified by the `wildcard` parameter.
// 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 (conn &Connection) tables(wildcard string) ?[]string {
cres := C.mysql_list_tables(conn.conn, wildcard.str)
if isnil(cres) {
return error_with_code(get_error_msg(conn.conn), get_errno(conn.conn))
@ -113,27 +118,28 @@ pub fn (conn Connection) tables(wildcard string) ?[]string {
for row in res.rows() {
tables << row.vals[0]
}
res.free()
return tables
}
// escape_string creates a legal SQL string for use in an SQL statement.
pub fn (conn Connection) escape_string(s 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 (conn &Connection) escape_string(s string) string {
to := malloc(2 * s.len + 1)
C.mysql_real_escape_string_quote(conn.conn, to, s.str, s.len, `\'`)
return unsafe {to.vstring()}
return unsafe { to.vstring() }
}
// set_option is used to set extra connect options and affect behavior for a connection.
// This function may be called multiple times to set several options.
// To retrieve option values, use `get_option()`.
pub fn (conn Connection) set_option(option_type int, val voidptr) {
// 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 conn Connection) set_option(option_type int, val voidptr) {
C.mysql_options(conn.conn, option_type, val)
}
// get_option returns the current value of an option settable `set_option`.
// The value should be treated as read only.
pub fn (conn Connection) get_option(option_type int) ?voidptr {
// get_option - return 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 (conn &Connection) get_option(option_type int) ?voidptr {
ret := voidptr(0)
if C.mysql_get_option(conn.conn, option_type, &ret) != 0 {
return error_with_code(get_error_msg(conn.conn), get_errno(conn.conn))
@ -141,79 +147,86 @@ pub fn (conn Connection) get_option(option_type int) ?voidptr {
return ret
}
// refresh flushes tables or caches, or resets replication server information.
// The connected user must have the `RELOAD` privilege.
pub fn (conn Connection) refresh(options u32) ?bool {
// refresh - flush the tables or caches, or resets replication server
// information. The connected user must have the `RELOAD` privilege.
pub fn (mut conn Connection) refresh(options u32) ?bool {
if C.mysql_refresh(conn.conn, options) != 0 {
return error_with_code(get_error_msg(conn.conn), get_errno(conn.conn))
}
return true
}
// reset resets the connection to clear the session state.
pub fn (conn Connection) reset() ?bool {
// reset - resets the connection, and clear the session state.
pub fn (mut conn Connection) reset() ?bool {
if C.mysql_reset_connection(conn.conn) != 0 {
return error_with_code(get_error_msg(conn.conn), get_errno(conn.conn))
}
return true
}
// ping pings a server connection, or tries to reconnect if the connection has gone down.
pub fn (conn Connection) ping() ?bool {
// ping - pings a server connection, or tries to reconnect if the connection
// has gone down.
pub fn (mut conn Connection) ping() ?bool {
if C.mysql_ping(conn.conn) != 0 {
return error_with_code(get_error_msg(conn.conn), get_errno(conn.conn))
}
return true
}
// close closes a previously opened database connection.
pub fn (conn &Connection) close() {
// close - closes the connection.
pub fn (mut conn Connection) close() {
C.mysql_close(conn.conn)
}
// -------------------------- MYSQL INFO & VERSION --------------------------
// info returns information about the most recently executed query.
pub fn (conn Connection) info() string {
// 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 (conn &Connection) info() string {
return resolve_nil_str(C.mysql_info(conn.conn))
}
// get_host_info returns a string describing the connection.
pub fn (conn Connection) get_host_info() string {
return unsafe {C.mysql_get_host_info(conn.conn).vstring()}
// get_host_info - returns a string describing the type of connection in use,
// including the server host name.
pub fn (conn &Connection) get_host_info() string {
return unsafe { C.mysql_get_host_info(conn.conn).vstring() }
}
// get_server_info returns the server version number as a string.
pub fn (conn Connection) get_server_info() string {
return unsafe {C.mysql_get_server_info(conn.conn).vstring()}
// get_server_info - returns a string representing the MySQL server version.
// For example, `8.0.24`.
pub fn (conn &Connection) get_server_info() string {
return unsafe { C.mysql_get_server_info(conn.conn).vstring() }
}
// get_server_version returns the server version number as an integer.
pub fn (conn Connection) get_server_version() u64 {
// 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 (conn &Connection) get_server_version() u64 {
return C.mysql_get_server_version(conn.conn)
}
// --------------------------------- CLIENT ---------------------------------
// get_client_info returns client version information as a string.
pub fn get_client_info() string {
return unsafe {C.mysql_get_client_info().vstring()}
}
// get_client_version returns client version information as an integer.
pub fn get_client_version() u64 {
return C.mysql_get_client_version()
}
// ------------------------------- MYSQL DEBUG ------------------------------
// dump_debug_info causes the server to write debug information to the log
pub fn (conn Connection) dump_debug_info() ?bool {
// 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 conn Connection) dump_debug_info() ?bool {
if C.mysql_dump_debug_info(conn.conn) != 0 {
return error_with_code(get_error_msg(conn.conn), get_errno(conn.conn))
}
return true
}
// debug does a `DBUG_PUSH` with the given string.
// See https://dev.mysql.com/doc/refman/5.7/en/mysql-debug.html
// get_client_info - returns client version information as a string.
pub fn get_client_info() string {
return unsafe { C.mysql_get_client_info().vstring() }
}
// get_client_version - returns the client version information as an integer.
pub fn get_client_version() u64 {
return C.mysql_get_client_version()
}
// debug - does a `DBUG_PUSH` with the given string.
// `debug()` uses the Fred Fish debug library.
// To use this function, you must compile the client library to support debugging.
// See https://dev.mysql.com/doc/c-api/8.0/en/mysql-debug.html
pub fn debug(debug string) {
C.mysql_debug(debug.str)
}

172
vlib/mysql/result.v
View File

@ -9,86 +9,6 @@ pub mut:
vals []string
}
// fetch_row fetches the next row from the result set.
pub fn (r Result) fetch_row() &byteptr {
return C.mysql_fetch_row(r.result)
}
// n_rows returns the number of rows in the result set.
pub fn (r Result) n_rows() u64 {
return C.mysql_num_rows(r.result)
}
// n_fields returns the number of columns in a result set.
pub fn (r Result) n_fields() int {
return C.mysql_num_fields(r.result)
}
// rows returns rows with `array` of columns.
pub fn (r Result) rows() []Row {
mut rows := []Row{}
nr_cols := r.n_fields()
for rr := r.fetch_row(); rr; rr = r.fetch_row() {
mut row := Row{}
for i in 0 .. nr_cols {
if unsafe {rr[i] == 0} {
row.vals << ''
} else {
row.vals << mystring(unsafe {byteptr(rr[i])})
}
}
rows << row
}
return rows
}
// Returns rows with `map` of columns instead `array` of columns.
pub fn (r Result) maps() []map[string]string {
mut array_map := []map[string]string{}
rows := r.rows()
fields := r.fields()
for i in 0 .. rows.len {
mut map_val := map[string]string{}
for j in 0 .. fields.len {
map_val[fields[j].name] = rows[i].vals[j]
}
array_map << map_val
}
return array_map
}
// fields returns an array of all field structures.
pub fn (r Result) fields() []Field {
mut fields := []Field{}
nr_cols := r.n_fields()
orig_fields := C.mysql_fetch_fields(r.result)
for i in 0 .. nr_cols {
unsafe {fields << Field{
name: mystring(orig_fields[i].name)
org_name: mystring(orig_fields[i].org_name)
table: mystring(orig_fields[i].table)
org_table: mystring(orig_fields[i].org_table)
db: mystring(orig_fields[i].db)
catalog: mystring(orig_fields[i].catalog)
def: resolve_nil_str(orig_fields[i].def)
length: orig_fields.length
max_length: orig_fields.max_length
name_length: orig_fields.name_length
org_name_length: orig_fields.org_name_length
table_length: orig_fields.table_length
org_table_length: orig_fields.org_table_length
db_length: orig_fields.db_length
catalog_length: orig_fields.catalog_length
def_length: orig_fields.def_length
flags: orig_fields.flags
decimals: orig_fields.decimals
charsetnr: orig_fields.charsetnr
type_: FieldType(orig_fields.@type)
}}
}
return fields
}
pub struct Field {
name string
org_name string
@ -112,6 +32,93 @@ pub struct Field {
type_ FieldType
}
// fetch_row - fetches the next row from a result.
pub fn (r Result) fetch_row() &byteptr {
return C.mysql_fetch_row(r.result)
}
// n_rows - returns the number of rows from a result.
pub fn (r Result) n_rows() u64 {
return C.mysql_num_rows(r.result)
}
// n_fields - returns the number of columns from a result.
pub fn (r Result) n_fields() int {
return C.mysql_num_fields(r.result)
}
// rows - returns array of rows, each containing an array of values,
// one for each column.
pub fn (r Result) rows() []Row {
mut rows := []Row{}
nr_cols := r.n_fields()
for rr := r.fetch_row(); rr; rr = r.fetch_row() {
mut row := Row{}
for i in 0 .. nr_cols {
if unsafe { rr[i] == 0 } {
row.vals << ''
} else {
row.vals << mystring(unsafe { byteptr(rr[i]) })
}
}
rows << row
}
return rows
}
// maps - returns an array of maps, each containing a set of
// field name: field value pairs.
pub fn (r Result) maps() []map[string]string {
mut array_map := []map[string]string{}
rows := r.rows()
fields := r.fields()
for i in 0 .. rows.len {
mut map_val := map[string]string{}
for j in 0 .. fields.len {
map_val[fields[j].name] = rows[i].vals[j]
}
array_map << map_val
}
return array_map
}
// fields - returns an array of fields/columns.
// The definitions apply primarily for columns of results,
// such as those produced by `SELECT` statements.
pub fn (r Result) fields() []Field {
mut fields := []Field{}
nr_cols := r.n_fields()
orig_fields := C.mysql_fetch_fields(r.result)
for i in 0 .. nr_cols {
unsafe {
fields << Field{
name: mystring(orig_fields[i].name)
org_name: mystring(orig_fields[i].org_name)
table: mystring(orig_fields[i].table)
org_table: mystring(orig_fields[i].org_table)
db: mystring(orig_fields[i].db)
catalog: mystring(orig_fields[i].catalog)
def: resolve_nil_str(orig_fields[i].def)
length: orig_fields.length
max_length: orig_fields.max_length
name_length: orig_fields.name_length
org_name_length: orig_fields.org_name_length
table_length: orig_fields.table_length
org_table_length: orig_fields.org_table_length
db_length: orig_fields.db_length
catalog_length: orig_fields.catalog_length
def_length: orig_fields.def_length
flags: orig_fields.flags
decimals: orig_fields.decimals
charsetnr: orig_fields.charsetnr
type_: FieldType(orig_fields.@type)
}
}
}
return fields
}
// str - serializes the field
pub fn (f Field) str() string {
return '
{
@ -139,7 +146,8 @@ pub fn (f Field) str() string {
'
}
// free frees memory used by a result set
pub fn (r Result) free() {
// free - frees the memory used by a result
[unsafe]
pub fn (r &Result) free() {
C.mysql_free_result(r.result)
}

10
vlib/mysql/utils.v
View File

@ -1,21 +1,21 @@
module mysql
// get_error_msg returns error message from MySQL instance.
// get_error_msg - returns error message from MySQL instance.
fn get_error_msg(conn &C.MYSQL) string {
return unsafe {C.mysql_error(conn).vstring()}
return unsafe { C.mysql_error(conn).vstring() }
}
// get_errno returns error number from MySQL instance.
// get_errno - returns error number from MySQL instance.
fn get_errno(conn &C.MYSQL) int {
return C.mysql_errno(conn)
}
// resolve_nil_str returns empty string if passed value is a nil pointer.
// resolve_nil_str - returns an empty string if passed value is a nil pointer.
fn resolve_nil_str(ptr byteptr) string {
if isnil(ptr) {
return ''
}
return unsafe {ptr.vstring()}
return unsafe { ptr.vstring() }
}
[inline]