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small fixes / documentation
This commit is contained in:
Cosmin Apreuetsei
parent
63beb9ab35
commit
439f6bc64f
37
mysql.lua
37
mysql.lua
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@ -1,4 +1,10 @@
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--mysql ffi binding (Cosmin Apreutesei, public domain). supports mysql Connector/C 6.1. based on mySQL 5.7 manual.
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--mySQL client library ffi binding.
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--Written by Cosmin Apreutesei. Public domain.
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--Supports mysql Connector/C 6.1.
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--Based on mySQL 5.7 manual.
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local ffi = require'ffi'
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local bit = require'bit'
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require'mysql_h'
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@ -22,24 +28,25 @@ end
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--error reporting
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local function myerror(mysql)
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local function myerror(mysql, stacklevel)
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local err = cstring(C.mysql_error(mysql))
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if not err then return end
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error(string.format('mysql error: %s', err))
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error(string.format('mysql error: %s', err), stacklevel or 3)
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end
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local function checkz(mysql, ret)
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if ret == 0 then return end
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myerror(mysql)
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myerror(mysql, 4)
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end
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local function checkh(mysql, ret)
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if ret ~= NULL then return ret end
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myerror(mysql)
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myerror(mysql, 4)
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end
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local function enum(e, prefix)
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return assert(type(e) == 'string' and (prefix and C[prefix..e] or C[e]) or e, 'invalid enum value')
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local v = type(e) == 'string' and (prefix and C[prefix..e] or C[e]) or e
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return assert(v, 'invalid enum value')
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end
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--client library info
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@ -582,7 +589,7 @@ local function fetch_row(res, numeric, assoc, decode, field_count, fields, t)
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local values = C.mysql_fetch_row(res)
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if values == NULL then
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if res.conn ~= NULL then --buffered read: check for errors
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myerror(res.conn)
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myerror(res.conn, 4)
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end
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return nil
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end
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@ -694,25 +701,25 @@ end
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--prepared statements
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local function sterror(stmt)
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local function sterror(stmt, stacklevel)
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local err = cstring(C.mysql_stmt_error(stmt))
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if not err then return end
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error(string.format('mysql error: %s', err))
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error(string.format('mysql error: %s', err), stacklevel or 3)
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end
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local function stcheckz(stmt, ret)
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if ret == 0 then return end
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sterror(stmt)
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sterror(stmt, 4)
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end
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local function stcheckbool(stmt, ret)
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if ret == 1 then return end
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sterror(stmt)
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sterror(stmt, 4)
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end
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local function stcheckh(stmt, ret)
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if ret ~= NULL then return ret end
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sterror(stmt)
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sterror(stmt, 4)
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end
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function conn.prepare(mysql, query)
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@ -774,11 +781,12 @@ end
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function stmt.result_metadata(stmt)
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local res = stcheckh(stmt, C.mysql_stmt_result_metadata(stmt))
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return ffi.gc(res, C.mysql_free_result)
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return res and ffi.gc(res, C.mysql_free_result)
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end
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function stmt.fields(stmt)
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local res = stmt:result_metadata()
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if not res then return nil end
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local fields = res:fields()
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return function()
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local i, info = fields()
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@ -1183,6 +1191,7 @@ function stmt.bind_result_types(stmt, maxsize)
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local types = {}
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local field_count = stmt:field_count()
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local res = stmt:result_metadata()
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if not res then return nil end
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for i=1,field_count do
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local ftype, size, unsigned, decimals = res:field_type(i)
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if ftype == 'decimal' then
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@ -1199,7 +1208,7 @@ function stmt.bind_result_types(stmt, maxsize)
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end
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function stmt.bind_params(stmt, ...)
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local types = type(...) == 'string' and {...} or ... or {}
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local types = type((...)) == 'string' and {...} or ... or {}
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assert(stmt:param_count() == #types, 'wrong number of param types')
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local bb = params_bind_buffer(types)
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stcheckz(stmt, C.mysql_stmt_bind_param(stmt, bb.buffer))
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5
mysql.md
5
mysql.md
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@ -51,6 +51,7 @@ A complete, lightweight ffi binding of the mysql client library.
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`conn:more_results() -> true | false` are there more result sets?
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**[Prepared statements]**
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`conn:prepare(query) -> stmt` prepare a query for multiple executions
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`stmt:param_count() -> n` number of params
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`stmt:exec()` execute a prepared statement
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`stmt:store_result()` store all the resulted rows to the client
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`stmt:fetch() -> true | false | true, 'truncated'` fetch the next row
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@ -322,6 +323,10 @@ The flow for prepared statements is like this:
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Prepare a query for multiple execution and return a statement object.
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## `stmt:param_count() -> n`
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Number of parameters.
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## `stmt:exec()`
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Execute a prepared statement.
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75
mysql_h.lua
75
mysql_h.lua
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@ -1,5 +1,8 @@
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--result of `cpp mysql.h` plus lots of cleanup and defines from other headers; by Cosmin Apreutesei; MySQL Connector/C 6.1
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--NOTE that MySQL Connector/C is GPL software. Could this file be considered "derived work" then?
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--result of `cpp mysql.h` with lots of cleanup and defines from other headers.
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--Written by Cosmin Apreutesei. MySQL Connector/C 6.1.
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--NOTE: MySQL Connector/C is GPL software. Is this "derived work" then?
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local ffi = require'ffi'
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@ -17,7 +20,7 @@ enum {
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MYSQL_DATA_TRUNCATED = 101
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};
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// -------------------------------------------------------------------------------- error constants
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// ----------------------------------------------------------- error constants
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// NOTE: added MYSQL_ prefix to these.
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enum mysql_error_code {
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@ -88,13 +91,13 @@ enum mysql_error_code {
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MYSQL_CR_AUTH_PLUGIN_ERR = 2061
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};
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// -------------------------------------------------------------------------------- client library
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// ------------------------------------------------------------ client library
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unsigned int mysql_thread_safe(void); // is the client library thread safe?
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unsigned int mysql_thread_safe(void); // is the client library thread safe?
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const char *mysql_get_client_info(void);
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unsigned long mysql_get_client_version(void);
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// -------------------------------------------------------------------------------- connections
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// --------------------------------------------------------------- connections
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typedef struct MYSQL_ MYSQL;
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@ -176,7 +179,8 @@ int mysql_set_character_set(MYSQL *mysql, const char *csname);
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int mysql_select_db(MYSQL *mysql, const char *db);
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my_bool mysql_change_user(MYSQL *mysql, const char *user, const char *passwd, const char *db);
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my_bool mysql_change_user(MYSQL *mysql, const char *user, const char *passwd,
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const char *db);
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my_bool mysql_ssl_set(MYSQL *mysql, const char *key,
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const char *cert, const char *ca,
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@ -189,7 +193,7 @@ enum enum_mysql_set_option
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};
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int mysql_set_server_option(MYSQL *mysql, enum enum_mysql_set_option option);
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// -------------------------------------------------------------------------------- connection info
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// ----------------------------------------------------------- connection info
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const char * mysql_character_set_name(MYSQL *mysql);
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@ -215,18 +219,19 @@ unsigned long mysql_get_server_version(MYSQL *mysql);
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unsigned int mysql_get_proto_info(MYSQL *mysql);
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const char * mysql_get_ssl_cipher(MYSQL *mysql);
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// -------------------------------------------------------------------------------- transactions
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// -------------------------------------------------------------- transactions
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my_bool mysql_commit(MYSQL * mysql);
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my_bool mysql_rollback(MYSQL * mysql);
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my_bool mysql_autocommit(MYSQL * mysql, my_bool auto_mode);
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// -------------------------------------------------------------------------------- queries
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// ------------------------------------------------------------------- queries
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unsigned long mysql_real_escape_string(MYSQL *mysql, char *to, const char *from, unsigned long length);
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unsigned long mysql_real_escape_string(MYSQL *mysql, char *to,
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const char *from, unsigned long length);
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int mysql_real_query(MYSQL *mysql, const char *q, unsigned long length);
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// -------------------------------------------------------------------------------- query info
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// ---------------------------------------------------------------- query info
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unsigned int mysql_field_count(MYSQL *mysql);
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my_ulonglong mysql_affected_rows(MYSQL *mysql);
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@ -237,7 +242,7 @@ const char * mysql_sqlstate(MYSQL *mysql);
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unsigned int mysql_warning_count(MYSQL *mysql);
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const char * mysql_info(MYSQL *mysql);
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// -------------------------------------------------------------------------------- query results
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// ------------------------------------------------------------- query results
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int mysql_next_result(MYSQL *mysql);
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my_bool mysql_more_results(MYSQL *mysql);
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@ -272,7 +277,7 @@ typedef MYSQL_ROWS *MYSQL_ROW_OFFSET;
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MYSQL_ROW_OFFSET mysql_row_tell(MYSQL_RES *res);
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MYSQL_ROW_OFFSET mysql_row_seek(MYSQL_RES *result, MYSQL_ROW_OFFSET offset);
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// -------------------------------------------------------------------------------- query field info
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// ---------------------------------------------------------- query field info
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enum enum_field_types {
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MYSQL_TYPE_DECIMAL, MYSQL_TYPE_TINY,
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@ -352,13 +357,13 @@ typedef struct st_mysql_field {
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MYSQL_FIELD *mysql_fetch_field_direct(MYSQL_RES *res, unsigned int fieldnr);
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// -------------------------------------------------------------------------------- reflection
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// ---------------------------------------------------------------- reflection
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MYSQL_RES *mysql_list_dbs(MYSQL *mysql, const char *wild);
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MYSQL_RES *mysql_list_tables(MYSQL *mysql, const char *wild);
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MYSQL_RES *mysql_list_processes(MYSQL *mysql);
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// -------------------------------------------------------------------------------- remote control
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// ------------------------------------------------------------ remote control
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int mysql_kill(MYSQL *mysql, unsigned long pid);
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MYSQL_REFRESH_USER_RESOURCES = 0x80000L,
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MYSQL_REFRESH_FOR_EXPORT = 0x100000L, /* FLUSH TABLES ... FOR EXPORT */
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};
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int mysql_refresh(MYSQL *mysql, unsigned int refresh_options); // needs RELOAD priviledge
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int mysql_dump_debug_info(MYSQL *mysql); // needs SUPER priviledge
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int mysql_refresh(MYSQL *mysql, unsigned int refresh_options); // needs RELOAD priviledge
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int mysql_dump_debug_info(MYSQL *mysql); // needs SUPER priviledge
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// -------------------------------------------------------------------------------- prepared statements
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// ------------------------------------------------------- prepared statements
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typedef struct MYSQL_STMT_ MYSQL_STMT;
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const char *data,
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unsigned long length);
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// -------------------------------------------------------------------------------- prepared statements / bindings
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// -------------------------------------------- prepared statements / bindings
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enum enum_mysql_timestamp_type
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{
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@ -511,7 +516,7 @@ int mysql_stmt_fetch_column(MYSQL_STMT *stmt, MYSQL_BIND *bind_arg,
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unsigned int column,
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unsigned long offset);
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// -------------------------------------------------------------------------------- LOAD DATA LOCAL INFILE hooks
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// ---------------------------------------------- LOAD DATA LOCAL INFILE hooks
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void mysql_set_local_infile_handler(MYSQL *mysql,
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int (*local_infile_init)(void **, const char *, void *),
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@ -521,31 +526,33 @@ void mysql_set_local_infile_handler(MYSQL *mysql,
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void *);
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void mysql_set_local_infile_default(MYSQL *mysql);
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// -------------------------------------------------------------------------------- mysql proxy scripting
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// ----------------------------------------------------- mysql proxy scripting
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my_bool mysql_read_query_result(MYSQL *mysql);
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// -------------------------------------------------------------------------------- debugging
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// ----------------------------------------------------------------- debugging
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void mysql_debug(const char *debug);
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// -------------------------------------------------------------------------------- present but not documented
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// ------------------------------------------------ present but not documented
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int mysql_server_init(int argc, char **argv, char **groups);
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void mysql_server_end(void);
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int mysql_server_init(int argc, char **argv, char **groups);
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void mysql_server_end(void);
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char *get_tty_password(const char *opt_message);
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void myodbc_remove_escape(MYSQL *mysql, char *name);
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my_bool mysql_embedded(void);
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int mysql_send_query(MYSQL *mysql, const char *q, unsigned long length);
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// -------------------------------------------------------------------------------- redundant functions
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// ------------------------------------------------------- redundant functions
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my_bool mysql_thread_init(void); // called anyway
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void mysql_thread_end(void); // called anyway
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void mysql_thread_end(void); // called anyway
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const char *mysql_errno_to_sqlstate(unsigned int mysql_errno); // use mysql_sqlstate
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unsigned long mysql_hex_string(char *to, const char *from, unsigned long from_length); // bad taste
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unsigned long mysql_hex_string(char *to, const char *from,
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unsigned long from_length); // bad taste
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// redundant ways to get field info (we use use mysql_field_count and mysql_fetch_field_direct)
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// redundant ways to get field info.
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// we use use mysql_field_count and mysql_fetch_field_direct instead.
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MYSQL_FIELD *mysql_fetch_field(MYSQL_RES *result);
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MYSQL_FIELD *mysql_fetch_fields(MYSQL_RES *res);
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typedef unsigned int MYSQL_FIELD_OFFSET;
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@ -553,10 +560,12 @@ MYSQL_FIELD_OFFSET mysql_field_tell(MYSQL_RES *res);
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MYSQL_FIELD_OFFSET mysql_field_seek(MYSQL_RES *result, MYSQL_FIELD_OFFSET offset);
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MYSQL_RES *mysql_stmt_param_metadata(MYSQL_STMT *stmt);
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// -------------------------------------------------------------------------------- deprecated functions
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// ------------------------------------------------------ deprecated functions
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unsigned long mysql_escape_string(char *to, const char *from, unsigned long from_length); // use mysql_real_escape_string
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unsigned long mysql_escape_string(char *to, const char *from,
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unsigned long from_length); // use mysql_real_escape_string
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int mysql_query(MYSQL *mysql, const char *q); // use mysql_real_query
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MYSQL_RES *mysql_list_fields(MYSQL *mysql, const char *table, const char *wild); // use "SHOW COLUMNS FROM table"
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MYSQL_RES *mysql_list_fields(MYSQL *mysql, const char *table,
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const char *wild); // use "SHOW COLUMNS FROM table"
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]]
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