// StringBuilder s = new StringBuilder(); // stmt.accept(new MySqlOutputAstVisitor(s)); // s.toString(); /// <exception cref="System.Exception" /> public override string GetSql() { var sql = "select id,member_id,gmt_create from offer where member_id in ('22')"; stmt = SqlParserDelegate.Parse(sql); return("select id,member_id,gmt_create from offer where member_id in ('1','22','333','1124','4525')"); }
// StringBuilder s = new StringBuilder(); // stmt.accept(new MySqlOutputAstVisitor(s)); // s.toString(); /// <exception cref="System.Exception" /> public override string GetSql() { var sql = "insert into xoffer (member_id, gmt_create) values ('1','2001-09-13 20:20:33')"; stmt = SqlParserDelegate.Parse(sql); return("insert into xoffer (member_id, gmt_create) values ('1','2001-09-13 20:20:33')"); }
//private static readonly Logger Logger = Logger.GetLogger(typeof(ServerRouter)); public static RouteResultset Route(SchemaConfig schema, string stmt, string charset, object info) { var rrs = new RouteResultset(stmt); // 检查是否含有cobar hint var prefixIndex = HintRouter.IndexOfPrefix(stmt); if (prefixIndex >= 0) { HintRouter.RouteFromHint(info, schema, rrs, prefixIndex, stmt); return(rrs); } // 检查schema是否含有拆分库 if (schema.IsNoSharding) { if (schema.IsKeepSqlSchema) { var ast = SqlParserDelegate.Parse(stmt, charset ?? MySqlParser.DefaultCharset); var visitor = new PartitionKeyVisitor(schema.Tables); visitor.SetTrimSchema(schema.Name); ast.Accept(visitor); if (visitor.IsSchemaTrimmed()) { stmt = GenSql(ast, stmt); } } var nodes = new RouteResultsetNode[1]; nodes[0] = new RouteResultsetNode(schema.DataNode, stmt); rrs.Nodes = nodes; return(rrs); } // 生成和展开AST var ast1 = SqlParserDelegate.Parse(stmt, charset ?? MySqlParser.DefaultCharset); var visitor1 = new PartitionKeyVisitor(schema.Tables); visitor1.SetTrimSchema(schema.IsKeepSqlSchema ? schema.Name : null); ast1.Accept(visitor1); // 如果sql包含用户自定义的schema,则路由到default节点 if (schema.IsKeepSqlSchema && visitor1.IsCustomedSchema()) { if (visitor1.IsSchemaTrimmed()) { stmt = GenSql(ast1, stmt); } var nodes = new RouteResultsetNode[1]; nodes[0] = new RouteResultsetNode(schema.DataNode, stmt); rrs.Nodes = nodes; return(rrs); } // 元数据语句路由 if (visitor1.IsTableMetaRead()) { MetaRouter.RouteForTableMeta(rrs, schema, ast1, visitor1, stmt); if (visitor1.IsNeedRewriteField()) { rrs.Flag = RouteResultset.RewriteField; } return(rrs); } // 匹配规则 TableConfig matchedTable = null; RuleConfig rule = null; IDictionary <string, IList <object> > columnValues = null; var astExt = visitor1.GetColumnValue(); var tables = schema.Tables; foreach (var e in astExt) { var col2Val = e.Value; var tc = tables.GetValue(e.Key); if (tc == null) { continue; } if (matchedTable == null) { matchedTable = tc; } if (col2Val == null || col2Val.IsEmpty()) { continue; } var tr = tc.Rule; if (tr != null) { foreach (var rc in tr.Rules) { var match = true; foreach (var ruleColumn in rc.Columns) { match &= col2Val.ContainsKey(ruleColumn); } if (match) { columnValues = col2Val; rule = rc; matchedTable = tc; goto ft_break; } } } } ft_break: ; // 规则匹配处理,表级别和列级别。 if (matchedTable == null) { var sql = visitor1.IsSchemaTrimmed() ? GenSql(ast1, stmt) : stmt; var rn = new RouteResultsetNode[1]; if (string.Empty.Equals(schema.DataNode) && IsSystemReadSql(ast1)) { rn[0] = new RouteResultsetNode(schema.RandomDataNode, sql); } else { rn[0] = new RouteResultsetNode(schema.DataNode, sql); } rrs.Nodes = rn; return(rrs); } if (rule == null) { if (matchedTable.IsRuleRequired) { throw new ArgumentException(string.Format("route rule for table {0} is required: {1}", matchedTable.Name, stmt)); } var dataNodes = matchedTable.DataNodes; var sql = visitor1.IsSchemaTrimmed() ? GenSql(ast1, stmt) : stmt; var rn = new RouteResultsetNode[dataNodes.Length]; for (var i = 0; i < dataNodes.Length; ++i) { rn[i] = new RouteResultsetNode(dataNodes[i], sql); } rrs.Nodes = rn; SetGroupFlagAndLimit(rrs, visitor1); return(rrs); } // 规则计算 ValidateAst(ast1, matchedTable, rule, visitor1); var dnMap = RuleCalculate(matchedTable, rule, columnValues); if (dnMap == null || dnMap.IsEmpty()) { throw new ArgumentException("No target dataNode for rule " + rule); } // 判断路由结果是单库还是多库 if (dnMap.Count == 1) { var dataNode = matchedTable.DataNodes[dnMap.Keys.FirstOrDefault()]; //string dataNode = matchedTable.GetDataNodes()[dnMap.Keys.GetEnumerator().Current]; var sql = visitor1.IsSchemaTrimmed() ? GenSql(ast1, stmt) : stmt; var rn = new RouteResultsetNode[1]; rn[0] = new RouteResultsetNode(dataNode, sql); rrs.Nodes = rn; } else { var rn = new RouteResultsetNode[dnMap.Count]; if (ast1 is DmlInsertReplaceStatement) { var ir = (DmlInsertReplaceStatement)ast1; DispatchInsertReplace(rn, ir, rule.Columns, dnMap, matchedTable, stmt, visitor1); } else { DispatchWhereBasedStmt(rn, ast1, rule.Columns, dnMap, matchedTable, stmt, visitor1); } rrs.Nodes = rn; SetGroupFlagAndLimit(rrs, visitor1); } return(rrs); }