improved sql parser. for issue #1919

src/main/java/com/alibaba/druid/filter/FilterManager.java

@@ -112,6 +112,9 @@ public class FilterManager {
 
                 try {
                     filter = (Filter) filterClass.newInstance();
+                } catch (ClassCastException e) {
+                    LOG.error("load filter error.", e);
+                    continue;
                 } catch (InstantiationException e) {
                     throw new SQLException("load managed jdbc driver event listener error. " + filterName, e);
                 } catch (IllegalAccessException e) {

src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlExprParser.java

@@ -78,6 +78,12 @@ public class MySqlExprParser extends SQLExprParser {
         this.lexer.nextToken();
     }
 
+
+    public MySqlExprParser(String sql, boolean skipComment,boolean keepComments){
+        this(new MySqlLexer(sql, skipComment, keepComments));
+        this.lexer.nextToken();
+    }
+
     public SQLExpr relationalRest(SQLExpr expr) {
         if (identifierEquals("REGEXP")) {
             lexer.nextToken();

src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlStatementParser.java

@@ -98,6 +98,10 @@ public class MySqlStatementParser extends SQLStatementParser {
         super(new MySqlExprParser(sql, keepComments));
     }
 
+    public MySqlStatementParser(String sql, boolean skipComment, boolean keepComments) {
+        super(new MySqlExprParser(sql, skipComment, keepComments));
+    }
+
     public MySqlStatementParser(Lexer lexer) {
         super(new MySqlExprParser(lexer));
     }

src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/OracleToMySqlOutputVisitor.java

@@ -1003,4 +1003,14 @@ public class OracleToMySqlOutputVisitor extends MySqlOutputVisitor implements Or
     public void endVisit(OracleTreatExpr x) {
 
     }
+
+    @Override
+    public boolean visit(OracleCreateSynonymStatement x) {
+        return false;
+    }
+
+    @Override
+    public void endVisit(OracleCreateSynonymStatement x) {
+
+    }
 }

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleCreateSynonymStatement.java

@@ -0,0 +1,57 @@
+package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
+
+import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
+
+public class OracleCreateSynonymStatement extends OracleStatementImpl {
+    private boolean orReplace;
+    private SQLName name;
+    private boolean isPublic;
+    private SQLName object;
+
+    @Override
+    public void accept0(OracleASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, name);
+            acceptChild(visitor, object);
+        }
+    }
+
+    public boolean isPublic() {
+        return isPublic;
+    }
+
+    public void setPublic(boolean value) {
+        isPublic = value;
+    }
+
+    public SQLName getName() {
+        return name;
+    }
+
+    public void setName(SQLName name) {
+        if (name != null) {
+            name.setParent(this);
+        }
+        this.name = name;
+    }
+
+    public SQLName getObject() {
+        return object;
+    }
+
+    public void setObject(SQLName object) {
+        if (object != null) {
+            object.setParent(this);
+        }
+        this.object = object;
+    }
+
+    public boolean isOrReplace() {
+        return orReplace;
+    }
+
+    public void setOrReplace(boolean orReplace) {
+        this.orReplace = orReplace;
+    }
+}

src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleExprParser.java

@@ -968,8 +968,19 @@ public class OracleExprParser extends SQLExprParser {
             }
             OracleDbLinkExpr dbLink = new OracleDbLinkExpr();
             dbLink.setExpr(name);
-            dbLink.setDbLink(lexer.stringVal());
+
+
+            String link = lexer.stringVal();
             lexer.nextToken();
+            while (lexer.token() == Token.DOT) {
+                lexer.nextToken();
+
+                String stringVal = lexer.stringVal();
+                accept(Token.IDENTIFIER);
+                link += "." + stringVal;
+            }
+
+            dbLink.setDbLink(link);
             return dbLink;
         }
         

src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java

@@ -2293,4 +2293,29 @@ public class OracleStatementParser extends SQLStatementParser {
         accept(Token.SEMI);
         return stmt;
     }
+
+    public SQLStatement parseCreateSynonym() {
+        OracleCreateSynonymStatement stmt = new OracleCreateSynonymStatement();
+        accept(Token.CREATE);
+
+        if (lexer.token() == Token.OR) {
+            lexer.nextToken();
+            accept(Token.REPLACE);
+            stmt.setOrReplace(true);
+        }
+
+        if (identifierEquals("PUBLIC")) {
+            lexer.nextToken();
+            stmt.setPublic(true);
+        }
+
+        acceptIdentifier("SYNONYM");
+
+        stmt.setName(this.exprParser.name());
+
+        accept(Token.FOR);
+
+        stmt.setObject(this.exprParser.name());
+        return stmt;
+    }
 }

src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleASTVisitor.java

@@ -427,4 +427,8 @@ public interface OracleASTVisitor extends SQLASTVisitor {
     boolean visit(OracleTreatExpr x);
 
     void endVisit(OracleTreatExpr x);
+
+    boolean visit(OracleCreateSynonymStatement x);
+
+    void endVisit(OracleCreateSynonymStatement x);
 }

src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleASTVisitorAdapter.java

@@ -1052,4 +1052,14 @@ public class OracleASTVisitorAdapter extends SQLASTVisitorAdapter implements Ora
     public void endVisit(OracleTreatExpr x) {
 
     }
+
+    @Override
+    public boolean visit(OracleCreateSynonymStatement x) {
+        return true;
+    }
+
+    @Override
+    public void endVisit(OracleCreateSynonymStatement x) {
+
+    }
 }

src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleOutputVisitor.java

@@ -3268,4 +3268,32 @@ public class OracleOutputVisitor extends SQLASTOutputVisitor implements OracleAS
     public void endVisit(OracleTreatExpr x) {
 
     }
+
+    @Override
+    public boolean visit(OracleCreateSynonymStatement x) {
+
+        if (x.isOrReplace()) {
+            print0(ucase ? "CREATE OR REPLACE " : "create or replace ");
+        } else {
+            print0(ucase ? "CREATE " : "create ");
+        }
+
+        if (x.isPublic()) {
+            print0(ucase ? "PUBLIC " : "public ");
+        }
+
+        print0(ucase ? "SYNONYM " : "synonym ");
+
+        x.getName().accept(this);
+
+        print0(ucase ? " FOR " : " for ");
+        x.getObject().accept(this);
+
+        return false;
+    }
+
+    @Override
+    public void endVisit(OracleCreateSynonymStatement x) {
+
+    }
 }

src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleSchemaStatVisitor.java

@@ -1445,4 +1445,14 @@ public class OracleSchemaStatVisitor extends SchemaStatVisitor implements Oracle
     public void endVisit(OracleTreatExpr x) {
 
     }
+
+    @Override
+    public boolean visit(OracleCreateSynonymStatement x) {
+        return false;
+    }
+
+    @Override
+    public void endVisit(OracleCreateSynonymStatement x) {
+
+    }
 }

src/main/java/com/alibaba/druid/sql/parser/SQLStatementParser.java

@@ -1853,9 +1853,21 @@ public class SQLStatementParser extends SQLParser {
 
             lexer.reset(markBp, markChar, Token.CREATE);
             return parseCreateDatabase();
-        } else if (identifierEquals("PUBLIC") || identifierEquals("SHARE")) {
+        } else if (identifierEquals("PUBLIC")) {
+            lexer.nextToken();
+            if (identifierEquals("SYNONYM")) {
+                lexer.reset(markBp, markChar, Token.CREATE);
+                return parseCreateSynonym();
+            } else {
+                lexer.reset(markBp, markChar, Token.CREATE);
+                return parseCreateDbLink();
+            }
+        } else if (identifierEquals("SHARE")) {
             lexer.reset(markBp, markChar, Token.CREATE);
             return parseCreateDbLink();
+        } else if (identifierEquals("SYNONYM")) {
+            lexer.reset(markBp, markChar, Token.CREATE);
+            return parseCreateSynonym();
         } else if (token == Token.VIEW) {
             return parseCreateView();
         } else if (token == Token.TRIGGER) {
@@ -1963,6 +1975,10 @@ public class SQLStatementParser extends SQLParser {
         throw new ParserException("TODO " + lexer.token());
     }
 
+    public SQLStatement parseCreateSynonym() {
+        throw new ParserException("TODO " + lexer.token());
+    }
+
     public SQLStatement parseCreateTrigger() {
         accept(Token.CREATE);
 

src/main/java/com/alibaba/druid/util/JdbcConstants.java

@@ -47,7 +47,7 @@ public interface JdbcConstants {
     public static final String MYSQL             = "mysql";
     public static final String MYSQL_DRIVER      = "com.mysql.jdbc.Driver";
     public static final String MYSQL_DRIVER_6    = "com.mysql.cj.jdbc.Driver";
-    public static final String MYSQL_DRIVER_REPLICATE = "com.mysql.jdbc.ReplicationDriver";
+    public static final String MYSQL_DRIVER_REPLICATE = "com.mysql.jdbc.";
 
     public static final String MARIADB           = "mariadb";
     public static final String MARIADB_DRIVER    = "org.mariadb.jdbc.Driver";