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sql.c
1141 lines (938 loc) · 28.4 KB
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sql.c
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// Copyright (c) Hercules Dev Team, licensed under GNU GPL.
// See the LICENSE file
// Portions Copyright (c) Athena Dev Teams
#include "../common/cbasetypes.h"
#include "../common/malloc.h"
#include "../common/showmsg.h"
#include "../common/strlib.h"
#include "../common/timer.h"
#include "sql.h"
#ifdef WIN32
#include "../common/winapi.h"
#endif
#include <mysql.h>
#include <string.h>// strlen/strnlen/memcpy/memset
#include <stdlib.h>// strtoul
void hercules_mysql_error_handler(unsigned int ecode);
int mysql_reconnect_type;
unsigned int mysql_reconnect_count;
/// Sql handle
struct Sql {
StringBuf buf;
MYSQL handle;
MYSQL_RES* result;
MYSQL_ROW row;
unsigned long* lengths;
int keepalive;
};
// Column length receiver.
// Takes care of the possible size missmatch between uint32 and unsigned long.
struct s_column_length {
uint32* out_length;
unsigned long length;
};
typedef struct s_column_length s_column_length;
/// Sql statement
struct SqlStmt {
StringBuf buf;
MYSQL_STMT* stmt;
MYSQL_BIND* params;
MYSQL_BIND* columns;
s_column_length* column_lengths;
size_t max_params;
size_t max_columns;
bool bind_params;
bool bind_columns;
};
///////////////////////////////////////////////////////////////////////////////
// Sql Handle
///////////////////////////////////////////////////////////////////////////////
/// Allocates and initializes a new Sql handle.
Sql* Sql_Malloc(void)
{
Sql* self;
CREATE(self, Sql, 1);
mysql_init(&self->handle);
StrBuf->Init(&self->buf);
self->lengths = NULL;
self->result = NULL;
self->keepalive = INVALID_TIMER;
self->handle.reconnect = 1;
return self;
}
static int Sql_P_Keepalive(Sql* self);
/// Establishes a connection.
int Sql_Connect(Sql* self, const char* user, const char* passwd, const char* host, uint16 port, const char* db)
{
if( self == NULL )
return SQL_ERROR;
StrBuf->Clear(&self->buf);
if( !mysql_real_connect(&self->handle, host, user, passwd, db, (unsigned int)port, NULL/*unix_socket*/, 0/*clientflag*/) )
{
ShowSQL("%s\n", mysql_error(&self->handle));
return SQL_ERROR;
}
self->keepalive = Sql_P_Keepalive(self);
if( self->keepalive == INVALID_TIMER )
{
ShowSQL("Failed to establish keepalive for DB connection!\n");
return SQL_ERROR;
}
return SQL_SUCCESS;
}
/// Retrieves the timeout of the connection.
int Sql_GetTimeout(Sql* self, uint32* out_timeout)
{
if( self && out_timeout && SQL_SUCCESS == SQL->Query(self, "SHOW VARIABLES LIKE 'wait_timeout'") ) {
char* data;
size_t len;
if( SQL_SUCCESS == SQL->NextRow(self) &&
SQL_SUCCESS == SQL->GetData(self, 1, &data, &len) ) {
*out_timeout = (uint32)strtoul(data, NULL, 10);
SQL->FreeResult(self);
return SQL_SUCCESS;
}
SQL->FreeResult(self);
}
return SQL_ERROR;
}
/// Retrieves the name of the columns of a table into out_buf, with the separator after each name.
int Sql_GetColumnNames(Sql* self, const char* table, char* out_buf, size_t buf_len, char sep)
{
char* data;
size_t len;
size_t off = 0;
if( self == NULL || SQL_ERROR == SQL->Query(self, "EXPLAIN `%s`", table) )
return SQL_ERROR;
out_buf[off] = '\0';
while( SQL_SUCCESS == SQL->NextRow(self) && SQL_SUCCESS == SQL->GetData(self, 0, &data, &len) ) {
len = strnlen(data, len);
if( off + len + 2 > buf_len )
{
ShowDebug("Sql_GetColumns: output buffer is too small\n");
*out_buf = '\0';
return SQL_ERROR;
}
memcpy(out_buf+off, data, len);
off += len;
out_buf[off++] = sep;
}
out_buf[off] = '\0';
SQL->FreeResult(self);
return SQL_SUCCESS;
}
/// Changes the encoding of the connection.
int Sql_SetEncoding(Sql* self, const char* encoding)
{
if( self && mysql_set_character_set(&self->handle, encoding) == 0 )
return SQL_SUCCESS;
return SQL_ERROR;
}
/// Pings the connection.
int Sql_Ping(Sql* self)
{
if( self && mysql_ping(&self->handle) == 0 )
return SQL_SUCCESS;
return SQL_ERROR;
}
/// Wrapper function for Sql_Ping.
///
/// @private
static int Sql_P_KeepaliveTimer(int tid, int64 tick, int id, intptr_t data)
{
Sql* self = (Sql*)data;
ShowInfo("Pinging SQL server to keep connection alive...\n");
Sql_Ping(self);
return 0;
}
/// Establishes keepalive (periodic ping) on the connection.
///
/// @return the keepalive timer id, or INVALID_TIMER
/// @private
static int Sql_P_Keepalive(Sql* self)
{
uint32 timeout, ping_interval;
// set a default value first
timeout = 28800; // 8 hours
// request the timeout value from the mysql server
Sql_GetTimeout(self, &timeout);
if( timeout < 60 )
timeout = 60;
// establish keepalive
ping_interval = timeout - 30; // 30-second reserve
//add_timer_func_list(Sql_P_KeepaliveTimer, "Sql_P_KeepaliveTimer");
return timer->add_interval(timer->gettick() + ping_interval*1000, Sql_P_KeepaliveTimer, 0, (intptr_t)self, ping_interval*1000);
}
/// Escapes a string.
size_t Sql_EscapeString(Sql* self, char *out_to, const char *from)
{
if( self )
return (size_t)mysql_real_escape_string(&self->handle, out_to, from, (unsigned long)strlen(from));
else
return (size_t)mysql_escape_string(out_to, from, (unsigned long)strlen(from));
}
/// Escapes a string.
size_t Sql_EscapeStringLen(Sql* self, char *out_to, const char *from, size_t from_len)
{
if( self )
return (size_t)mysql_real_escape_string(&self->handle, out_to, from, (unsigned long)from_len);
else
return (size_t)mysql_escape_string(out_to, from, (unsigned long)from_len);
}
/// Executes a query.
int Sql_Query(Sql* self, const char* query, ...)
{
int res;
va_list args;
va_start(args, query);
res = SQL->QueryV(self, query, args);
va_end(args);
return res;
}
/// Executes a query.
int Sql_QueryV(Sql* self, const char* query, va_list args)
{
if( self == NULL )
return SQL_ERROR;
SQL->FreeResult(self);
StrBuf->Clear(&self->buf);
StrBuf->Vprintf(&self->buf, query, args);
if( mysql_real_query(&self->handle, StrBuf->Value(&self->buf), (unsigned long)StrBuf->Length(&self->buf)) )
{
ShowSQL("DB error - %s\n", mysql_error(&self->handle));
hercules_mysql_error_handler(mysql_errno(&self->handle));
return SQL_ERROR;
}
self->result = mysql_store_result(&self->handle);
if( mysql_errno(&self->handle) != 0 )
{
ShowSQL("DB error - %s\n", mysql_error(&self->handle));
hercules_mysql_error_handler(mysql_errno(&self->handle));
return SQL_ERROR;
}
return SQL_SUCCESS;
}
/// Executes a query.
int Sql_QueryStr(Sql* self, const char* query)
{
if( self == NULL )
return SQL_ERROR;
SQL->FreeResult(self);
StrBuf->Clear(&self->buf);
StrBuf->AppendStr(&self->buf, query);
if( mysql_real_query(&self->handle, StrBuf->Value(&self->buf), (unsigned long)StrBuf->Length(&self->buf)) )
{
ShowSQL("DB error - %s\n", mysql_error(&self->handle));
hercules_mysql_error_handler(mysql_errno(&self->handle));
return SQL_ERROR;
}
self->result = mysql_store_result(&self->handle);
if( mysql_errno(&self->handle) != 0 )
{
ShowSQL("DB error - %s\n", mysql_error(&self->handle));
hercules_mysql_error_handler(mysql_errno(&self->handle));
return SQL_ERROR;
}
return SQL_SUCCESS;
}
/// Returns the number of the AUTO_INCREMENT column of the last INSERT/UPDATE query.
uint64 Sql_LastInsertId(Sql* self)
{
if( self )
return (uint64)mysql_insert_id(&self->handle);
else
return 0;
}
/// Returns the number of columns in each row of the result.
uint32 Sql_NumColumns(Sql* self)
{
if( self && self->result )
return (uint32)mysql_num_fields(self->result);
return 0;
}
/// Returns the number of rows in the result.
uint64 Sql_NumRows(Sql* self)
{
if( self && self->result )
return (uint64)mysql_num_rows(self->result);
return 0;
}
/// Fetches the next row.
int Sql_NextRow(Sql* self) {
if( self && self->result ) {
self->row = mysql_fetch_row(self->result);
if( self->row ) {
self->lengths = mysql_fetch_lengths(self->result);
return SQL_SUCCESS;
}
self->lengths = NULL;
if( mysql_errno(&self->handle) == 0 )
return SQL_NO_DATA;
}
return SQL_ERROR;
}
/// Gets the data of a column.
int Sql_GetData(Sql* self, size_t col, char** out_buf, size_t* out_len)
{
if( self && self->row ) {
if( col < SQL->NumColumns(self) ) {
if( out_buf ) *out_buf = self->row[col];
if( out_len ) *out_len = (size_t)self->lengths[col];
} else {// out of range - ignore
if( out_buf ) *out_buf = NULL;
if( out_len ) *out_len = 0;
}
return SQL_SUCCESS;
}
return SQL_ERROR;
}
/// Frees the result of the query.
void Sql_FreeResult(Sql* self) {
if( self && self->result ) {
mysql_free_result(self->result);
self->result = NULL;
self->row = NULL;
self->lengths = NULL;
}
}
/// Shows debug information (last query).
void Sql_ShowDebug_(Sql* self, const char* debug_file, const unsigned long debug_line)
{
if( self == NULL )
ShowDebug("at %s:%lu - self is NULL\n", debug_file, debug_line);
else if( StrBuf->Length(&self->buf) > 0 )
ShowDebug("at %s:%lu - %s\n", debug_file, debug_line, StrBuf->Value(&self->buf));
else
ShowDebug("at %s:%lu\n", debug_file, debug_line);
}
/// Frees a Sql handle returned by Sql_Malloc.
void Sql_Free(Sql* self)
{
if( self )
{
SQL->FreeResult(self);
StrBuf->Destroy(&self->buf);
if( self->keepalive != INVALID_TIMER ) timer->delete(self->keepalive, Sql_P_KeepaliveTimer);
aFree(self);
}
}
///////////////////////////////////////////////////////////////////////////////
// Prepared Statements
///////////////////////////////////////////////////////////////////////////////
/// Returns the mysql integer type for the target size.
///
/// @private
static enum enum_field_types Sql_P_SizeToMysqlIntType(int sz)
{
switch( sz )
{
case 1: return MYSQL_TYPE_TINY;
case 2: return MYSQL_TYPE_SHORT;
case 4: return MYSQL_TYPE_LONG;
case 8: return MYSQL_TYPE_LONGLONG;
default:
ShowDebug("SizeToMysqlIntType: unsupported size (%d)\n", sz);
return MYSQL_TYPE_NULL;
}
}
/// Binds a parameter/result.
///
/// @private
static int Sql_P_BindSqlDataType(MYSQL_BIND* bind, enum SqlDataType buffer_type, void* buffer, size_t buffer_len, unsigned long* out_length, int8* out_is_null)
{
memset(bind, 0, sizeof(MYSQL_BIND));
switch( buffer_type )
{
case SQLDT_NULL: bind->buffer_type = MYSQL_TYPE_NULL;
buffer_len = 0;// FIXME length = ? [FlavioJS]
break;
// fixed size
case SQLDT_UINT8: bind->is_unsigned = 1;
case SQLDT_INT8: bind->buffer_type = MYSQL_TYPE_TINY;
buffer_len = 1;
break;
case SQLDT_UINT16: bind->is_unsigned = 1;
case SQLDT_INT16: bind->buffer_type = MYSQL_TYPE_SHORT;
buffer_len = 2;
break;
case SQLDT_UINT32: bind->is_unsigned = 1;
case SQLDT_INT32: bind->buffer_type = MYSQL_TYPE_LONG;
buffer_len = 4;
break;
case SQLDT_UINT64: bind->is_unsigned = 1;
case SQLDT_INT64: bind->buffer_type = MYSQL_TYPE_LONGLONG;
buffer_len = 8;
break;
// platform dependent size
case SQLDT_UCHAR: bind->is_unsigned = 1;
case SQLDT_CHAR: bind->buffer_type = Sql_P_SizeToMysqlIntType(sizeof(char));
buffer_len = sizeof(char);
break;
case SQLDT_USHORT: bind->is_unsigned = 1;
case SQLDT_SHORT: bind->buffer_type = Sql_P_SizeToMysqlIntType(sizeof(short));
buffer_len = sizeof(short);
break;
case SQLDT_UINT: bind->is_unsigned = 1;
case SQLDT_INT: bind->buffer_type = Sql_P_SizeToMysqlIntType(sizeof(int));
buffer_len = sizeof(int);
break;
case SQLDT_ULONG: bind->is_unsigned = 1;
case SQLDT_LONG: bind->buffer_type = Sql_P_SizeToMysqlIntType(sizeof(long));
buffer_len = sizeof(long);
break;
case SQLDT_ULONGLONG: bind->is_unsigned = 1;
case SQLDT_LONGLONG: bind->buffer_type = Sql_P_SizeToMysqlIntType(sizeof(int64));
buffer_len = sizeof(int64);
break;
// floating point
case SQLDT_FLOAT: bind->buffer_type = MYSQL_TYPE_FLOAT;
buffer_len = 4;
break;
case SQLDT_DOUBLE: bind->buffer_type = MYSQL_TYPE_DOUBLE;
buffer_len = 8;
break;
// other
case SQLDT_STRING:
case SQLDT_ENUM: bind->buffer_type = MYSQL_TYPE_STRING;
break;
case SQLDT_BLOB: bind->buffer_type = MYSQL_TYPE_BLOB;
break;
default:
ShowDebug("Sql_P_BindSqlDataType: unsupported buffer type (%d)\n", buffer_type);
return SQL_ERROR;
}
bind->buffer = buffer;
bind->buffer_length = (unsigned long)buffer_len;
bind->length = out_length;
bind->is_null = (my_bool*)out_is_null;
return SQL_SUCCESS;
}
/// Prints debug information about a field (type and length).
///
/// @private
static void Sql_P_ShowDebugMysqlFieldInfo(const char* prefix, enum enum_field_types type, int is_unsigned, unsigned long length, const char* length_postfix)
{
const char* sign = (is_unsigned ? "UNSIGNED " : "");
const char* type_string;
switch( type )
{
default:
ShowDebug("%stype=%s%u, length=%d\n", prefix, sign, type, length);
return;
#define SHOW_DEBUG_OF(x) case x: type_string = #x; break
SHOW_DEBUG_OF(MYSQL_TYPE_TINY);
SHOW_DEBUG_OF(MYSQL_TYPE_SHORT);
SHOW_DEBUG_OF(MYSQL_TYPE_LONG);
SHOW_DEBUG_OF(MYSQL_TYPE_INT24);
SHOW_DEBUG_OF(MYSQL_TYPE_LONGLONG);
SHOW_DEBUG_OF(MYSQL_TYPE_DECIMAL);
SHOW_DEBUG_OF(MYSQL_TYPE_FLOAT);
SHOW_DEBUG_OF(MYSQL_TYPE_DOUBLE);
SHOW_DEBUG_OF(MYSQL_TYPE_TIMESTAMP);
SHOW_DEBUG_OF(MYSQL_TYPE_DATE);
SHOW_DEBUG_OF(MYSQL_TYPE_TIME);
SHOW_DEBUG_OF(MYSQL_TYPE_DATETIME);
SHOW_DEBUG_OF(MYSQL_TYPE_YEAR);
SHOW_DEBUG_OF(MYSQL_TYPE_STRING);
SHOW_DEBUG_OF(MYSQL_TYPE_VAR_STRING);
SHOW_DEBUG_OF(MYSQL_TYPE_BLOB);
SHOW_DEBUG_OF(MYSQL_TYPE_SET);
SHOW_DEBUG_OF(MYSQL_TYPE_ENUM);
SHOW_DEBUG_OF(MYSQL_TYPE_NULL);
#undef SHOW_DEBUG_TYPE_OF
}
ShowDebug("%stype=%s%s, length=%d%s\n", prefix, sign, type_string, length, length_postfix);
}
/// Reports debug information about a truncated column.
///
/// @private
static void SqlStmt_P_ShowDebugTruncatedColumn(SqlStmt* self, size_t i)
{
MYSQL_RES* meta;
MYSQL_FIELD* field;
MYSQL_BIND* column;
meta = mysql_stmt_result_metadata(self->stmt);
field = mysql_fetch_field_direct(meta, (unsigned int)i);
ShowSQL("DB error - data of field '%s' was truncated.\n", field->name);
ShowDebug("column - %lu\n", (unsigned long)i);
Sql_P_ShowDebugMysqlFieldInfo("data - ", field->type, field->flags&UNSIGNED_FLAG, self->column_lengths[i].length, "");
column = &self->columns[i];
if( column->buffer_type == MYSQL_TYPE_STRING )
Sql_P_ShowDebugMysqlFieldInfo("buffer - ", column->buffer_type, column->is_unsigned, column->buffer_length, "+1(nul-terminator)");
else
Sql_P_ShowDebugMysqlFieldInfo("buffer - ", column->buffer_type, column->is_unsigned, column->buffer_length, "");
mysql_free_result(meta);
}
/// Allocates and initializes a new SqlStmt handle.
SqlStmt* SqlStmt_Malloc(Sql* sql) {
SqlStmt* self;
MYSQL_STMT* stmt;
if( sql == NULL )
return NULL;
stmt = mysql_stmt_init(&sql->handle);
if( stmt == NULL ) {
ShowSQL("DB error - %s\n", mysql_error(&sql->handle));
return NULL;
}
CREATE(self, SqlStmt, 1);
StrBuf->Init(&self->buf);
self->stmt = stmt;
self->params = NULL;
self->columns = NULL;
self->column_lengths = NULL;
self->max_params = 0;
self->max_columns = 0;
self->bind_params = false;
self->bind_columns = false;
return self;
}
/// Prepares the statement.
int SqlStmt_Prepare(SqlStmt* self, const char* query, ...)
{
int res;
va_list args;
va_start(args, query);
res = SQL->StmtPrepareV(self, query, args);
va_end(args);
return res;
}
/// Prepares the statement.
int SqlStmt_PrepareV(SqlStmt* self, const char* query, va_list args)
{
if( self == NULL )
return SQL_ERROR;
SQL->StmtFreeResult(self);
StrBuf->Clear(&self->buf);
StrBuf->Vprintf(&self->buf, query, args);
if( mysql_stmt_prepare(self->stmt, StrBuf->Value(&self->buf), (unsigned long)StrBuf->Length(&self->buf)) )
{
ShowSQL("DB error - %s\n", mysql_stmt_error(self->stmt));
hercules_mysql_error_handler(mysql_stmt_errno(self->stmt));
return SQL_ERROR;
}
self->bind_params = false;
return SQL_SUCCESS;
}
/// Prepares the statement.
int SqlStmt_PrepareStr(SqlStmt* self, const char* query)
{
if( self == NULL )
return SQL_ERROR;
SQL->StmtFreeResult(self);
StrBuf->Clear(&self->buf);
StrBuf->AppendStr(&self->buf, query);
if( mysql_stmt_prepare(self->stmt, StrBuf->Value(&self->buf), (unsigned long)StrBuf->Length(&self->buf)) )
{
ShowSQL("DB error - %s\n", mysql_stmt_error(self->stmt));
hercules_mysql_error_handler(mysql_stmt_errno(self->stmt));
return SQL_ERROR;
}
self->bind_params = false;
return SQL_SUCCESS;
}
/// Returns the number of parameters in the prepared statement.
size_t SqlStmt_NumParams(SqlStmt* self)
{
if( self )
return (size_t)mysql_stmt_param_count(self->stmt);
else
return 0;
}
/// Binds a parameter to a buffer.
int SqlStmt_BindParam(SqlStmt* self, size_t idx, enum SqlDataType buffer_type, void* buffer, size_t buffer_len)
{
if( self == NULL )
return SQL_ERROR;
if( !self->bind_params )
{// initialize the bindings
size_t i;
size_t count;
count = SQL->StmtNumParams(self);
if( self->max_params < count )
{
self->max_params = count;
RECREATE(self->params, MYSQL_BIND, count);
}
memset(self->params, 0, count*sizeof(MYSQL_BIND));
for( i = 0; i < count; ++i )
self->params[i].buffer_type = MYSQL_TYPE_NULL;
self->bind_params = true;
}
if( idx < self->max_params )
return Sql_P_BindSqlDataType(self->params+idx, buffer_type, buffer, buffer_len, NULL, NULL);
else
return SQL_SUCCESS;// out of range - ignore
}
/// Executes the prepared statement.
int SqlStmt_Execute(SqlStmt* self)
{
if( self == NULL )
return SQL_ERROR;
SQL->StmtFreeResult(self);
if( (self->bind_params && mysql_stmt_bind_param(self->stmt, self->params)) ||
mysql_stmt_execute(self->stmt) )
{
ShowSQL("DB error - %s\n", mysql_stmt_error(self->stmt));
hercules_mysql_error_handler(mysql_stmt_errno(self->stmt));
return SQL_ERROR;
}
self->bind_columns = false;
if( mysql_stmt_store_result(self->stmt) )// store all the data
{
ShowSQL("DB error - %s\n", mysql_stmt_error(self->stmt));
hercules_mysql_error_handler(mysql_stmt_errno(self->stmt));
return SQL_ERROR;
}
return SQL_SUCCESS;
}
/// Returns the number of the AUTO_INCREMENT column of the last INSERT/UPDATE statement.
uint64 SqlStmt_LastInsertId(SqlStmt* self)
{
if( self )
return (uint64)mysql_stmt_insert_id(self->stmt);
else
return 0;
}
/// Returns the number of columns in each row of the result.
size_t SqlStmt_NumColumns(SqlStmt* self)
{
if( self )
return (size_t)mysql_stmt_field_count(self->stmt);
else
return 0;
}
/// Binds the result of a column to a buffer.
int SqlStmt_BindColumn(SqlStmt* self, size_t idx, enum SqlDataType buffer_type, void* buffer, size_t buffer_len, uint32* out_length, int8* out_is_null)
{
if( self == NULL )
return SQL_ERROR;
if( buffer_type == SQLDT_STRING || buffer_type == SQLDT_ENUM )
{
if( buffer_len < 1 )
{
ShowDebug("SqlStmt_BindColumn: buffer_len(%d) is too small, no room for the nul-terminator\n", buffer_len);
return SQL_ERROR;
}
--buffer_len;// nul-terminator
}
if( !self->bind_columns )
{// initialize the bindings
size_t i;
size_t cols;
cols = SQL->StmtNumColumns(self);
if( self->max_columns < cols )
{
self->max_columns = cols;
RECREATE(self->columns, MYSQL_BIND, cols);
RECREATE(self->column_lengths, s_column_length, cols);
}
memset(self->columns, 0, cols*sizeof(MYSQL_BIND));
memset(self->column_lengths, 0, cols*sizeof(s_column_length));
for( i = 0; i < cols; ++i )
self->columns[i].buffer_type = MYSQL_TYPE_NULL;
self->bind_columns = true;
}
if( idx < self->max_columns )
{
self->column_lengths[idx].out_length = out_length;
return Sql_P_BindSqlDataType(self->columns+idx, buffer_type, buffer, buffer_len, &self->column_lengths[idx].length, out_is_null);
}
else
{
return SQL_SUCCESS;// out of range - ignore
}
}
/// Returns the number of rows in the result.
uint64 SqlStmt_NumRows(SqlStmt* self)
{
if( self )
return (uint64)mysql_stmt_num_rows(self->stmt);
else
return 0;
}
/// Fetches the next row.
int SqlStmt_NextRow(SqlStmt* self)
{
int err;
size_t i;
size_t cols;
MYSQL_BIND* column;
unsigned long length;
if( self == NULL )
return SQL_ERROR;
// bind columns
if( self->bind_columns && mysql_stmt_bind_result(self->stmt, self->columns) )
err = 1;// error binding columns
else
err = mysql_stmt_fetch(self->stmt);// fetch row
// check for errors
if( err == MYSQL_NO_DATA )
return SQL_NO_DATA;
#if defined(MYSQL_DATA_TRUNCATED)
// MySQL 5.0/5.1 defines and returns MYSQL_DATA_TRUNCATED [FlavioJS]
if( err == MYSQL_DATA_TRUNCATED )
{
my_bool truncated;
if( !self->bind_columns )
{
ShowSQL("DB error - data truncated (unknown source, columns are not bound)\n");
return SQL_ERROR;
}
// find truncated column
cols = SQL->StmtNumColumns(self);
for( i = 0; i < cols; ++i )
{
column = &self->columns[i];
column->error = &truncated;
mysql_stmt_fetch_column(self->stmt, column, (unsigned int)i, 0);
column->error = NULL;
if( truncated )
{// report truncated column
SqlStmt_P_ShowDebugTruncatedColumn(self, i);
return SQL_ERROR;
}
}
ShowSQL("DB error - data truncated (unknown source)\n");
return SQL_ERROR;
}
#endif
if( err )
{
ShowSQL("DB error - %s\n", mysql_stmt_error(self->stmt));
hercules_mysql_error_handler(mysql_stmt_errno(self->stmt));
return SQL_ERROR;
}
// propagate column lengths and clear unused parts of string/enum/blob buffers
cols = SQL->StmtNumColumns(self);
for( i = 0; i < cols; ++i )
{
length = self->column_lengths[i].length;
column = &self->columns[i];
#if !defined(MYSQL_DATA_TRUNCATED)
// MySQL 4.1/(below?) returns success even if data is truncated, so we test truncation manually [FlavioJS]
if( column->buffer_length < length )
{// report truncated column
if( column->buffer_type == MYSQL_TYPE_STRING || column->buffer_type == MYSQL_TYPE_BLOB )
{// string/enum/blob column
SqlStmt_P_ShowDebugTruncatedColumn(self, i);
return SQL_ERROR;
}
// FIXME numeric types and null [FlavioJS]
}
#endif
if( self->column_lengths[i].out_length )
*self->column_lengths[i].out_length = (uint32)length;
if( column->buffer_type == MYSQL_TYPE_STRING )
{// clear unused part of the string/enum buffer (and nul-terminate)
memset((char*)column->buffer + length, 0, column->buffer_length - length + 1);
}
else if( column->buffer_type == MYSQL_TYPE_BLOB && length < column->buffer_length )
{// clear unused part of the blob buffer
memset((char*)column->buffer + length, 0, column->buffer_length - length);
}
}
return SQL_SUCCESS;
}
/// Frees the result of the statement execution.
void SqlStmt_FreeResult(SqlStmt* self)
{
if( self )
mysql_stmt_free_result(self->stmt);
}
/// Shows debug information (with statement).
void SqlStmt_ShowDebug_(SqlStmt* self, const char* debug_file, const unsigned long debug_line)
{
if( self == NULL )
ShowDebug("at %s:%lu - self is NULL\n", debug_file, debug_line);
else if( StrBuf->Length(&self->buf) > 0 )
ShowDebug("at %s:%lu - %s\n", debug_file, debug_line, StrBuf->Value(&self->buf));
else
ShowDebug("at %s:%lu\n", debug_file, debug_line);
}
/// Frees a SqlStmt returned by SqlStmt_Malloc.
void SqlStmt_Free(SqlStmt* self)
{
if( self )
{
SqlStmt_FreeResult(self);
StrBuf->Destroy(&self->buf);
mysql_stmt_close(self->stmt);
if( self->params )
aFree(self->params);
if( self->columns )
{
aFree(self->columns);
aFree(self->column_lengths);
}
aFree(self);
}
}
/* receives mysql error codes during runtime (not on first-time-connects) */
void hercules_mysql_error_handler(unsigned int ecode) {
static unsigned int retry = 1;
switch( ecode ) {
case 2003:/* Can't connect to MySQL (this error only happens here when failing to reconnect) */
if( mysql_reconnect_type == 1 ) {
if( ++retry > mysql_reconnect_count ) {
ShowFatalError("MySQL has been unreachable for too long, %d reconnects were attempted. Shutting Down\n", retry);
exit(EXIT_FAILURE);
}
}
break;
}
}
void Sql_inter_server_read(const char* cfgName, bool first) {
int i;
char line[1024], w1[1024], w2[1024];
FILE* fp;
fp = fopen(cfgName, "r");
if(fp == NULL) {
if( first ) {
ShowFatalError("File not found: %s\n", cfgName);
exit(EXIT_FAILURE);
} else
ShowError("File not found: %s\n", cfgName);
return;
}
while(fgets(line, sizeof(line), fp)) {
i = sscanf(line, "%[^:]: %[^\r\n]", w1, w2);
if(i != 2)
continue;
if(!strcmpi(w1,"mysql_reconnect_type")) {
mysql_reconnect_type = atoi(w2);
switch( mysql_reconnect_type ) {
case 1:
case 2:
break;
default:
ShowError("%s::mysql_reconnect_type is set to %d which is not valid, defaulting to 1...\n", cfgName, mysql_reconnect_type);
mysql_reconnect_type = 1;
break;
}
} else if(!strcmpi(w1,"mysql_reconnect_count")) {
mysql_reconnect_count = atoi(w2);
if( mysql_reconnect_count < 1 )
mysql_reconnect_count = 1;
} else if(!strcmpi(w1,"import"))
Sql_inter_server_read(w2,false);
}
fclose(fp);
return;
}