--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/evsql/evsql.h	Thu Oct 16 22:04:53 2008 +0300
@@ -0,0 +1,136 @@
+#ifndef EVSQL_INTERNAL_H
+#define EVSQL_INTERNAL_H
+
+/*
+ * Internal interfaces
+ */
+
+#include <sys/queue.h>
+
+#include <event2/event.h>
+
+#include "../evsql.h"
+#include "../evpq.h"
+
+/*
+ * The engine type
+ */
+enum evsql_type {
+    EVSQL_EVPQ,     // evpq
+};
+
+/*
+ * Contains the type, engine configuration, list of connections and waiting query queue.
+ */
+struct evsql {
+    // what event_base to use
+    struct event_base *ev_base;
+
+    // what engine we use
+    enum evsql_type type;
+
+    // callbacks
+    evsql_error_cb error_fn;
+    void *cb_arg;
+    
+    // engine-specific connection configuration
+    union {
+        const char *evpq;
+    } engine_conf;
+
+    // list of connections that are open
+    LIST_HEAD(evsql_conn_list, evsql_conn) conn_list;
+   
+    // list of queries running or waiting to run
+    TAILQ_HEAD(evsql_query_queue, evsql_query) query_queue;
+};
+
+/*
+ * A single connection to the server.
+ *
+ * Contains the engine connection, may have a transaction associated, and may have a query associated.
+ */
+struct evsql_conn {
+    // evsql we belong to
+    struct evsql *evsql;
+
+    // engine-specific connection info
+    union {
+        struct evpq_conn *evpq;
+    } engine;
+
+    // our position in the conn list
+    LIST_ENTRY(evsql_conn) entry;
+
+    // are we running a transaction?
+    struct evsql_trans *trans;
+
+    // are we running a transactionless query?
+    struct evsql_query *query;
+};
+
+/*
+ * A single transaction.
+ *
+ * Has a connection associated and possibly a query (which will also be associated with the connection)
+ */
+struct evsql_trans {
+    // our evsql_conn/evsql
+    struct evsql *evsql;
+    struct evsql_conn *conn;
+    
+    // callbacks
+    evsql_trans_error_cb error_fn;
+    evsql_trans_ready_cb ready_fn;
+    evsql_trans_done_cb done_fn;
+    void *cb_arg;
+
+    // the transaction type
+    enum evsql_trans_type type;
+
+    // has evsql_trans_commit be called?
+    int has_commit : 1;
+
+    // our current query
+    struct evsql_query *query;
+
+};
+
+/*
+ * A single query.
+ *
+ * Has the info needed to exec the query (as these may be queued), and the callback/result info.
+ */
+struct evsql_query {
+    // the actual SQL query, this may or may not be ours, see _evsql_query_exec
+    char *command;
+    
+    // possible query params
+    struct evsql_query_param_info {
+        int count;
+
+        Oid *types;
+        const char **values;
+        int *lengths;
+        int *formats;
+
+        int result_format;
+    } params;
+
+    // our callback
+    evsql_query_cb cb_fn;
+    void *cb_arg;
+
+    // our position in the query list
+    TAILQ_ENTRY(evsql_query) entry;
+
+    // the result
+    union {
+        PGresult *evpq;
+    } result;
+};
+
+// maximum length for a 'BEGIN TRANSACTION ...' query
+#define EVSQL_QUERY_BEGIN_BUF 512
+
+#endif /* EVSQL_INTERNAL_H */