Wed, 26 Nov 2008 10:43:45 +0000
Clean up error messages for consistency.
#include "dbd_sqlite3.h" /* * Converts SQLite types to Lua types */ static lua_push_type_t sqlite_to_lua_push(unsigned int sqlite_type) { lua_push_type_t lua_type; switch(sqlite_type) { case SQLITE_NULL: lua_type = LUA_PUSH_NIL; break; case SQLITE_INTEGER: lua_type = LUA_PUSH_INTEGER; break; case SQLITE_FLOAT: lua_type = LUA_PUSH_NUMBER; break; default: lua_type = LUA_PUSH_STRING; } return lua_type; } /* * runs sqlite3_step on a statement handle */ static int step(statement_t *statement) { int res = sqlite3_step(statement->stmt); if (res == SQLITE_DONE) { statement->more_data = 0; return 1; } else if (res == SQLITE_ROW) { statement->more_data = 1; return 1; } return 0; } /* * success = statement:close() */ int statement_close(lua_State *L) { statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_SQLITE_STATEMENT); int ok = 0; if (statement->stmt) { if (sqlite3_finalize(statement->stmt) == SQLITE_OK) { ok = 1; } statement->stmt = NULL; } lua_pushboolean(L, ok); return 1; } /* * success,err = statement:execute(...) */ int statement_execute(lua_State *L) { int n = lua_gettop(L); statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_SQLITE_STATEMENT); int p; int err = 0; if (!statement->stmt) { lua_pushboolean(L, 0); lua_pushstring(L, DBI_ERR_EXECUTE_INVALID); return 2; } /* * reset the handle before binding params * this wil be a NOP if the handle has not * been executed */ if (sqlite3_reset(statement->stmt) != SQLITE_OK) { lua_pushboolean(L, 0); lua_pushfstring(L, DBI_ERR_EXECUTE_FAILED, sqlite3_errmsg(statement->sqlite)); return 2; } for (p = 2; p <= n; p++) { int i = p - 1; if (lua_isnil(L, p)) { if (sqlite3_bind_null(statement->stmt, i) != SQLITE_OK) { err = 1; } } else if (lua_isnumber(L, p)) { if (sqlite3_bind_double(statement->stmt, i, luaL_checknumber(L, p)) != SQLITE_OK) { err = 1; } } else if (lua_isstring(L, p)) { if (sqlite3_bind_text(statement->stmt, i, luaL_checkstring(L, p), -1, SQLITE_STATIC) != SQLITE_OK) { err = 1; } } if (err) break; } if (err) { lua_pushboolean(L, 0); lua_pushfstring(L, DBI_ERR_BINDING_PARAMS, sqlite3_errmsg(statement->sqlite)); return 2; } if (!step(statement)) { lua_pushboolean(L, 0); lua_pushfstring(L, DBI_ERR_EXECUTE_FAILED, sqlite3_errmsg(statement->sqlite)); } lua_pushboolean(L, 1); return 1; } /* * must be called after an execute */ static int statement_fetch_impl(lua_State *L, int named_columns) { statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_SQLITE_STATEMENT); int num_columns; if (!statement->stmt) { luaL_error(L, DBI_ERR_FETCH_INVALID); return 0; } if (!statement->more_data) { /* * Result set is empty, or not result set returned */ lua_pushnil(L); return 1; } num_columns = sqlite3_column_count(statement->stmt); if (num_columns) { int i; int d = 1; lua_newtable(L); for (i = 0; i < num_columns; i++) { lua_push_type_t lua_push = sqlite_to_lua_push(sqlite3_column_type(statement->stmt, i)); const char *name = sqlite3_column_name(statement->stmt, i); if (lua_push == LUA_PUSH_NIL) { if (named_columns) { LUA_PUSH_ATTRIB_NIL(name); } else { LUA_PUSH_ARRAY_NIL(d); } } else if (lua_push == LUA_PUSH_INTEGER) { int val = sqlite3_column_int(statement->stmt, i); if (named_columns) { LUA_PUSH_ATTRIB_INT(name, val); } else { LUA_PUSH_ARRAY_INT(d, val); } } else if (lua_push == LUA_PUSH_NUMBER) { double val = sqlite3_column_double(statement->stmt, i); if (named_columns) { LUA_PUSH_ATTRIB_FLOAT(name, val); } else { LUA_PUSH_ARRAY_FLOAT(d, val); } } else if (lua_push == LUA_PUSH_STRING) { const char *val = (const char *)sqlite3_column_text(statement->stmt, i); if (named_columns) { LUA_PUSH_ATTRIB_STRING(name, val); } else { LUA_PUSH_ARRAY_STRING(d, val); } } else if (lua_push == LUA_PUSH_BOOLEAN) { int val = sqlite3_column_int(statement->stmt, i); if (named_columns) { LUA_PUSH_ATTRIB_BOOL(name, val); } else { LUA_PUSH_ARRAY_BOOL(d, val); } } else { luaL_error(L, DBI_ERR_UNKNOWN_PUSH); } } } else { /* * no columns returned by statement? */ lua_pushnil(L); } if (step(statement) == 0) { if (sqlite3_reset(statement->stmt) != SQLITE_OK) { /* * reset needs to be called to retrieve the 'real' error message */ luaL_error(L, DBI_ERR_FETCH_FAILED, sqlite3_errmsg(statement->sqlite)); } } return 1; } /* * array = statement:fetch() */ static int statement_fetch(lua_State *L) { return statement_fetch_impl(L, 0); } /* * hashmap = statement:fetchtable() */ static int statement_fetchtable(lua_State *L) { return statement_fetch_impl(L, 1); } /* * __gc */ static int statement_gc(lua_State *L) { /* always free the handle */ statement_close(L); return 0; } int dbd_sqlite3_statement_create(lua_State *L, connection_t *conn, const char *sql_query) { statement_t *statement = NULL; statement = (statement_t *)lua_newuserdata(L, sizeof(statement_t)); statement->sqlite = conn->sqlite; statement->stmt = NULL; statement->more_data = 0; if (sqlite3_prepare_v2(statement->sqlite, sql_query, strlen(sql_query), &statement->stmt, NULL) != SQLITE_OK) { lua_pushnil(L); lua_pushfstring(L, DBI_ERR_PREP_STATEMENT, sqlite3_errmsg(statement->sqlite)); return 2; } luaL_getmetatable(L, DBD_SQLITE_STATEMENT); lua_setmetatable(L, -2); return 1; } int dbd_sqlite3_statement(lua_State *L) { static const luaL_Reg statement_methods[] = { {"close", statement_close}, {"execute", statement_execute}, {"fetch", statement_fetch}, {"fetchtable", statement_fetchtable}, {NULL, NULL} }; static const luaL_Reg statement_class_methods[] = { {NULL, NULL} }; luaL_newmetatable(L, DBD_SQLITE_STATEMENT); luaL_register(L, 0, statement_methods); lua_pushvalue(L,-1); lua_setfield(L, -2, "__index"); lua_pushcfunction(L, statement_gc); lua_setfield(L, -2, "__gc"); luaL_register(L, DBD_SQLITE_STATEMENT, statement_class_methods); return 1; }