tristaZero commented on a change in pull request #4117: add visitor for dal
URL:
https://github.com/apache/incubator-shardingsphere/pull/4117#discussion_r373913553
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File path:
shardingsphere-sql-parser/shardingsphere-sql-parser-mysql/src/main/java/org/apache/shardingsphere/sql/parser/MySQLVisitor.java
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@@ -217,27 +229,97 @@
@Override
public ASTNode visitUse(final UseContext ctx) {
LiteralValue schema = (LiteralValue) visit(ctx.schemaName());
- UseStatement useStatement = new UseStatement();
- useStatement.setSchema(schema.getLiteral());
- return useStatement;
+ UseStatement result = new UseStatement();
+ result.setSchema(schema.getLiteral());
+ return result;
+ }
+
+ @Override
+ public ASTNode visitDesc(final DescContext ctx) {
+ TableSegment table = (TableSegment) visit(ctx.tableName());
+ DescribeStatement result = new DescribeStatement();
+ result.setTable(table);
+ return result;
+ }
+
+ @Override
+ public ASTNode visitShowDatabases(final ShowDatabasesContext ctx) {
+ ShowDatabasesStatement result = new ShowDatabasesStatement();
+ ShowLikeContext showLikeContext = ctx.showLike();
+ if (null != showLikeContext) {
+ ShowLikeSegment showLikeSegment = (ShowLikeSegment)
visit(ctx.showLike());
+ result.getAllSQLSegments().add(showLikeSegment);
+ }
+ return result;
+ }
+
+ @Override
+ public ASTNode visitShowTables(final ShowTablesContext ctx) {
+ ShowTablesStatement result = new ShowTablesStatement();
+ FromSchemaContext fromSchemaContext = ctx.fromSchema();
+ ShowLikeContext showLikeContext = ctx.showLike();
+ if (null != fromSchemaContext) {
+ FromSchemaSegment fromSchemaSegment = (FromSchemaSegment)
visit(ctx.fromSchema());
+ result.getAllSQLSegments().add(fromSchemaSegment);
+ }
+ if (null != showLikeContext) {
+ ShowLikeSegment showLikeSegment = (ShowLikeSegment)
visit(ctx.showLike());
+ result.getAllSQLSegments().add(showLikeSegment);
+ }
+ return result;
}
@Override
public ASTNode visitShowTableStatus(final ShowTableStatusContext ctx) {
- ShowTableStatusStatement showTableStatusStatement = new
ShowTableStatusStatement();
+ ShowTableStatusStatement result = new ShowTableStatusStatement();
FromSchemaContext fromSchemaContext = ctx.fromSchema();
ShowLikeContext showLikeContext = ctx.showLike();
if (null != fromSchemaContext) {
FromSchemaSegment fromSchemaSegment = (FromSchemaSegment)
visit(ctx.fromSchema());
-
showTableStatusStatement.getAllSQLSegments().add(fromSchemaSegment);
+ result.getAllSQLSegments().add(fromSchemaSegment);
}
if (null != showLikeContext) {
ShowLikeSegment showLikeSegment = (ShowLikeSegment)
visit(ctx.showLike());
- showTableStatusStatement.getAllSQLSegments().add(showLikeSegment);
+ result.getAllSQLSegments().add(showLikeSegment);
}
- return showTableStatusStatement;
+ return result;
}
-
+
+ @Override
+ public ASTNode visitShowColumns(final ShowColumnsContext ctx) {
+ ShowColumnsStatement result = new ShowColumnsStatement();
Review comment:
How to handle the rule `fromTable_` of `showColumns` in `DALStatement.g4`?
Please notice change the name of `fromTable_` once visit it.
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