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13 General Public License for more details.
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22 * @brief library to help with access to a MySQL database
23 * @author Christophe Genevey
24 * @author Christian Grothoff
27 #include <mysql/mysql.h>
28 #include "gnunet_my_lib.h"
32 * Run a prepared SELECT statement.
34 * @param mc mysql context
35 * @param sh handle to SELECT statment
36 * @param params parameters to the statement
38 #GNUNET_YES if we can prepare all statement
39 #GNUNET_SYSERR if we can't prepare all statement
42 GNUNET_MY_exec_prepared (struct GNUNET_MYSQL_Context *mc,
43 struct GNUNET_MYSQL_StatementHandle *sh,
44 struct GNUNET_MY_QueryParam *params)
46 const struct GNUNET_MY_QueryParam *p;
52 for (i=0;NULL != params[i].conv;i++)
53 num += params[i].num_params;
55 MYSQL_BIND qbind[num];
58 memset(qbind, 0, sizeof(qbind));
60 for (i=0;NULL != (p = ¶ms[i])->conv;i++)
67 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
68 "Conversion for MySQL query failed at offset %u\n",
74 stmt = GNUNET_MYSQL_statement_get_stmt (mc, sh);
75 if (mysql_stmt_bind_param (stmt,
78 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, "mysql",
79 _("`%s' failed at %s:%d with error: %s\n"),
80 "mysql_stmt_bind_param", __FILE__, __LINE__,
81 mysql_stmt_error (stmt));
82 GNUNET_MYSQL_statements_invalidate (mc);
86 if (mysql_stmt_execute (stmt))
88 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, "mysql",
89 _("`%s' failed at %s:%d with error: %s\n"),
90 "mysql_stmt_execute", __FILE__, __LINE__,
91 mysql_stmt_error (stmt));
92 GNUNET_MYSQL_statements_invalidate (mc);
96 GNUNET_MY_cleanup_query (params,
105 * Free all memory that was allocated in @a qp during
106 * #GNUNET_MY_exect_prepared().
108 * @param qp query specification to clean up
109 * @param qbind array of parameter to clean up
112 GNUNET_MY_cleanup_query (struct GNUNET_MY_QueryParam *qp,
117 for (i=0; NULL != qp[i].conv ;i++)
118 if (NULL != qp[i].cleaner)
119 qp[i].cleaner (qp[i].conv_cls,
125 * Extract results from a query result according to the given
126 * specification. Always fetches the next row.
129 * @param sh statement that returned results
130 * @param rs specification to extract for
132 * #GNUNET_YES if all results could be extracted
133 * #GNUNET_NO if there is no more data in the result set
134 * #GNUNET_SYSERR if a result was invalid
137 GNUNET_MY_extract_result (struct GNUNET_MYSQL_StatementHandle *sh,
138 struct GNUNET_MY_ResultSpec *rs)
140 unsigned int num_fields;
145 stmt = GNUNET_MYSQL_statement_get_stmt (NULL, sh);
148 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, "mysql",
149 ("`%s' failed at %s:%d with error: %s\n"),
150 "mysql_stmt_bind_result", __FILE__, __LINE__,
151 mysql_stmt_error (stmt));
152 return GNUNET_SYSERR;
156 for (i=0;NULL != rs[i].pre_conv;i++)
157 num_fields += rs[i].num_fields;
159 if (mysql_stmt_field_count (stmt) != num_fields)
161 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
162 "Number of fields missmatch between SQL result and result specification\n");
163 return GNUNET_SYSERR;
167 MYSQL_BIND result[num_fields];
168 unsigned int field_off;
170 memset (result, 0, sizeof (MYSQL_BIND) * num_fields);
172 for (i=0;NULL != rs[i].pre_conv;i++)
174 struct GNUNET_MY_ResultSpec *rp = &rs[i];
177 rp->pre_conv (rp->conv_cls,
183 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
184 "Pre-conversion for MySQL result failed at offset %u\n",
186 return GNUNET_SYSERR;
188 field_off += rp->num_fields;
190 if (mysql_stmt_bind_result (stmt, result))
192 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
194 _("`%s' failed at %s:%d with error: %s\n"),
195 "mysql_stmt_bind_result", __FILE__, __LINE__,
196 mysql_stmt_error (stmt));
197 return GNUNET_SYSERR;
200 ret = mysql_stmt_fetch (stmt);
202 if (MYSQL_NO_DATA == ret)
204 if ((0 != ret ) && (MYSQL_DATA_TRUNCATED != ret))
206 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
208 _("mysql_stmt_fetch failed at %s:%d with error: %s\n"),
210 mysql_stmt_error (stmt));
211 GNUNET_MY_cleanup_result (rs);
212 return GNUNET_SYSERR;
215 for (i=0;NULL != rs[i].post_conv;i++)
217 struct GNUNET_MY_ResultSpec *rp = &rs[i];
219 if (NULL != rp->post_conv)
221 rp->post_conv (rp->conv_cls,
227 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
228 "Post-conversion for MySQL result failed at offset %u\n",
230 GNUNET_MY_cleanup_result (rs);
231 return GNUNET_SYSERR;
233 field_off += rp->num_fields;
241 * Free all memory that was allocated in @a rs during
242 * #GNUNET_MY_extract_result().
244 * @param rs result specification to clean up
247 GNUNET_MY_cleanup_result (struct GNUNET_MY_ResultSpec *rs)
251 for (i=0;NULL != rs[i].post_conv;i++)
252 if (NULL != rs[i].cleaner)
253 rs[i].cleaner (rs[i].conv_cls,