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src/main/java/net/tccn/dbq/fbean/ParseMysql.java

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+package net.tccn.dbq.fbean;
+
+import net.tccn.meta.MetaKit;
+import net.tccn.meta.MetaLink;
+import net.tccn.meta.MetaService;
+import net.tccn.meta.MetaTable;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Predicate;
+
+/**
+ * Created by liangxianyou at 2018/12/24 15:49.
+ */
+public class ParseMysql implements Parser {
+
+    private Predicate isEmpty = (x) -> {
+        if (x == null)
+            return true;
+        if (x instanceof List)
+            return ((List) x).isEmpty();
+        if (x instanceof String)
+            return ((String) x).isEmpty();
+        if (x instanceof Map)
+            return ((Map) x).isEmpty();
+        if (x instanceof Collection)
+            return ((Collection) x).isEmpty();
+        return false;
+    };
+
+    @Override
+    public String parse(FBean fBean) {
+        MetaService metaService = MetaKit.metaService(fBean.getName());
+
+        //基础属性
+        MetaTable metaTable = metaService.getMetaTable();//基础元数据
+        List<MetaLink> linkTables = metaService.getMetaLinks();//表关联条件
+        Map<String, MetaTable> attachTable = metaService.getTables();//用到的关联表
+        List<String> shows = metaService.getShows();//查询的属性
+
+        //查询条件
+        List<Filter> filters = fBean.getFilters();
+        Limit limit = fBean.getLimit();
+        List<Order> orders = fBean.getOrders();
+
+        StringBuilder buf = new StringBuilder();
+        //select
+        buf.append("select ");
+        if (!isEmpty.test(shows)) {
+            shows.forEach(x -> {
+                //buf.append("`").append("x").append("`").append(",");
+                buf.append(x).append(",");
+            });
+            buf.deleteCharAt(buf.length() - 1);
+        } else {
+            buf.append("*");
+        }
+
+        //from
+        buf.append(" from ").append("`").append(metaTable.getName()).append("` ").append(metaTable.getAlias());
+
+        //left join
+        if (!isEmpty.test(linkTables)) {
+            linkTables.forEach(x -> {
+                MetaTable leftTable = attachTable.get(metaTable.getAlias().equals(x.getTables()[0]) ? x.getTables()[1] : x.getTables()[0]);
+
+                buf.append(" left join ").append(leftTable.getName()).append(" ").append(leftTable.getAlias()).append(" on ");
+                int tag = buf.length();
+                x.getLink().forEach((k,v) -> {
+                    if (buf.length() > tag) {
+                        buf.append(" and ");
+                    }
+                    buf.append(k).append("=").append(v);
+                });
+            });
+        }
+
+        //where
+        if (!isEmpty.test(filters)) {
+            buf.append(Filter.filter(filters, DbType.MYSQL));
+        }
+
+        //order by
+        if (!isEmpty.test(orders)) {
+            buf.append(" ").append(Order.order(orders, DbType.MYSQL));
+        }
+
+        //limit
+        buf.append(" ").append(limit.limit());
+        return buf.toString();
+    }
+
+    @Override
+    public String parse(Filter filter) {
+        return null;
+    }
+
+    @Override
+    public String parseSave(MetaService ms, Map data) {
+        String sqlTpl = "insert %s (%s) value (%s)";
+        StringBuilder bufK = new StringBuilder();
+        StringBuilder bufV = new StringBuilder();
+        data.forEach((k,v) -> {
+            if (v != null || !String.valueOf(v).isEmpty()) {
+                bufK.append("`").append(k).append("`,");
+                if (v instanceof Number) {
+                    bufV.append(v).append(",");
+                } else {
+                    bufV.append("'").append(v).append("',");
+                }
+            }
+        });
+        bufK.deleteCharAt(bufK.length() - 1);
+        bufV.deleteCharAt(bufV.length() - 1);
+        return String.format(sqlTpl, ms.getMetaTable().getName(), bufK.toString(), bufV.toString());
+    }
+}