Support multiple schema configuration for Sharding-proxy

sharding-core/src/main/java/io/shardingsphere/core/merger/dal/DALMergeEngine.java

@@ -22,12 +22,14 @@
 import io.shardingsphere.core.merger.QueryResult;
 import io.shardingsphere.core.merger.dal.show.ShowCreateTableMergedResult;
 import io.shardingsphere.core.merger.dal.show.ShowDatabasesMergedResult;
+import io.shardingsphere.core.merger.dal.show.ShowIndexMergedResult;
 import io.shardingsphere.core.merger.dal.show.ShowOtherMergedResult;
 import io.shardingsphere.core.merger.dal.show.ShowTableStatusMergedResult;
 import io.shardingsphere.core.merger.dal.show.ShowTablesMergedResult;
 import io.shardingsphere.core.metadata.table.ShardingTableMetaData;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowCreateTableStatement;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowDatabasesStatement;
+import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowIndexStatement;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowTableStatusStatement;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowTablesStatement;
 import io.shardingsphere.core.parsing.parser.sql.dal.DALStatement;
@@ -68,6 +70,9 @@ public MergedResult merge() throws SQLException {
         if (dalStatement instanceof ShowCreateTableStatement) {
             return new ShowCreateTableMergedResult(shardingRule, queryResults, shardingTableMetaData);
         }
+        if (dalStatement instanceof ShowIndexStatement) {
+            return new ShowIndexMergedResult(shardingRule, queryResults, shardingTableMetaData);
+        }
         return new ShowOtherMergedResult(queryResults.get(0));
     }
 }

sharding-core/src/main/java/io/shardingsphere/core/merger/dal/show/ShowIndexMergedResult.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2016-2018 shardingsphere.io.
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * </p>
+ */
+
+package io.shardingsphere.core.merger.dal.show;
+
+import io.shardingsphere.core.merger.QueryResult;
+import io.shardingsphere.core.metadata.table.ShardingTableMetaData;
+import io.shardingsphere.core.rule.ShardingRule;
+
+import java.sql.SQLException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Merged result for show index.
+ * 
+ * @author chenqingyang
+ */
+public final class ShowIndexMergedResult extends LogicTablesMergedResult {
+
+    private static final Map<String, Integer> LABEL_AND_INDEX_MAP = new HashMap<>(13, 1);
+
+    static {
+        LABEL_AND_INDEX_MAP.put("Table", 1);
+        LABEL_AND_INDEX_MAP.put("Non_unique", 2);
+        LABEL_AND_INDEX_MAP.put("Key_name", 3);
+        LABEL_AND_INDEX_MAP.put("Seq_in_index", 4);
+        LABEL_AND_INDEX_MAP.put("Column_name", 5);
+        LABEL_AND_INDEX_MAP.put("Collation", 6);
+        LABEL_AND_INDEX_MAP.put("Cardinality", 7);
+        LABEL_AND_INDEX_MAP.put("Sub_part", 8);
+        LABEL_AND_INDEX_MAP.put("Packed", 9);
+        LABEL_AND_INDEX_MAP.put("Null", 10);
+        LABEL_AND_INDEX_MAP.put("Index_type", 11);
+        LABEL_AND_INDEX_MAP.put("Comment", 12);
+        LABEL_AND_INDEX_MAP.put("Index_comment", 13);
+    }
+
+    public ShowIndexMergedResult(final ShardingRule shardingRule, final List<QueryResult> queryResults, final ShardingTableMetaData shardingTableMetaData) throws SQLException {
+        super(LABEL_AND_INDEX_MAP, shardingRule, queryResults, shardingTableMetaData);
+    }
+}

sharding-core/src/main/java/io/shardingsphere/core/merger/dal/show/ShowTablesMergedResult.java

@@ -44,4 +44,16 @@ public final class ShowTablesMergedResult extends LogicTablesMergedResult {
     public ShowTablesMergedResult(final ShardingRule shardingRule, final List<QueryResult> queryResults, final ShardingTableMetaData shardingTableMetaData) throws SQLException {
         super(LABEL_AND_INDEX_MAP, shardingRule, queryResults, shardingTableMetaData);
     }
+
+    /**
+     * Reset column label.
+     * 
+     * @param schema schema 
+     */
+    public void resetColumnLabel(final String schema) {
+        Map<String, Integer> labelAndIndexMapnew = new HashMap<>(1, 1);
+        labelAndIndexMapnew.put(schema, 1);
+        resetLabelAndIndexMap(labelAndIndexMapnew);
+    }
+
 }

sharding-core/src/main/java/io/shardingsphere/core/merger/dql/common/MemoryMergedResult.java

@@ -47,6 +47,11 @@ public abstract class MemoryMergedResult implements MergedResult {
 
     private boolean wasNull;
 
+    protected final void resetLabelAndIndexMap(final Map<String, Integer> labelAndIndexMap) {
+        this.labelAndIndexMap.clear();
+        this.labelAndIndexMap.putAll(labelAndIndexMap);
+    }
+
     @Override
     public final Object getValue(final int columnIndex, final Class<?> type) throws SQLException {
         if (Blob.class == type || Clob.class == type || Reader.class == type || InputStream.class == type || SQLXML.class == type) {

sharding-core/src/main/java/io/shardingsphere/core/parsing/SQLJudgeEngine.java

@@ -24,11 +24,15 @@
 import io.shardingsphere.core.parsing.lexer.token.Assist;
 import io.shardingsphere.core.parsing.lexer.token.DefaultKeyword;
 import io.shardingsphere.core.parsing.lexer.token.Keyword;
+import io.shardingsphere.core.parsing.lexer.token.Symbol;
 import io.shardingsphere.core.parsing.lexer.token.TokenType;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.DescribeStatement;
+import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.SetStatement;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowColumnsStatement;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowDatabasesStatement;
+import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowIndexStatement;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowOtherStatement;
+import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowTableStatusStatement;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowTablesStatement;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.UseStatement;
 import io.shardingsphere.core.parsing.parser.exception.SQLParsingException;
@@ -41,6 +45,7 @@
 import io.shardingsphere.core.parsing.parser.sql.dql.DQLStatement;
 import io.shardingsphere.core.parsing.parser.sql.dql.select.SelectStatement;
 import io.shardingsphere.core.parsing.parser.sql.tcl.TCLStatement;
+import io.shardingsphere.core.parsing.parser.token.SchemaToken;
 import lombok.RequiredArgsConstructor;
 
 /**
@@ -72,7 +77,7 @@ public SQLStatement judge() {
                     return getDMLStatement(tokenType);
                 }
                 if (TCLStatement.isTCL(tokenType)) {
-                    return getTCLStatement();
+                    return getTCLStatement(tokenType);
                 }
                 if (DALStatement.isDAL(tokenType)) {
                     return getDALStatement(tokenType, lexerEngine);
@@ -113,7 +118,10 @@ private SQLStatement getDCLStatement() {
         return new DCLStatement();
     }
 
-    private SQLStatement getTCLStatement() {
+    private SQLStatement getTCLStatement(final TokenType tokenType) {
+        if (DefaultKeyword.SET == tokenType) {
+            return new SetStatement();
+        }
         return new TCLStatement();
     }
 
@@ -130,15 +138,73 @@ private SQLStatement getDALStatement(final TokenType tokenType, final LexerEngin
 
     private SQLStatement getShowStatement(final LexerEngine lexerEngine) {
         lexerEngine.nextToken();
-        if (MySQLKeyword.DATABASES == lexerEngine.getCurrentToken().getType()) {
+        lexerEngine.skipIfEqual(DefaultKeyword.FULL);
+        if (lexerEngine.equalAny(MySQLKeyword.DATABASES)) {
             return new ShowDatabasesStatement();
         }
-        if (MySQLKeyword.TABLES == lexerEngine.getCurrentToken().getType()) {
-            return new ShowTablesStatement();
+        if (lexerEngine.skipIfEqual(DefaultKeyword.TABLE, MySQLKeyword.STATUS)) {
+            return parseShowTableStatus(lexerEngine);
+        }
+        if (lexerEngine.skipIfEqual(MySQLKeyword.TABLES)) {
+            return parseShowTables(lexerEngine);
+        }
+        if (lexerEngine.skipIfEqual(MySQLKeyword.COLUMNS, MySQLKeyword.FIELDS)) {
+            return parseShowColumnsFields(lexerEngine);
         }
-        if (MySQLKeyword.COLUMNS == lexerEngine.getCurrentToken().getType()) {
-            return new ShowColumnsStatement();
+        if (lexerEngine.skipIfEqual(DefaultKeyword.INDEX, MySQLKeyword.INDEXES, MySQLKeyword.KEYS)) {
+            return parseShowIndex(lexerEngine);
         }
         return new ShowOtherStatement();
     }
+
+    private DALStatement parseShowTables(final LexerEngine lexerEngine) {
+        DALStatement result = new ShowTablesStatement();
+        if (lexerEngine.skipIfEqual(DefaultKeyword.FROM, DefaultKeyword.IN)) {
+            int beginPosition = lexerEngine.getCurrentToken().getEndPosition() - lexerEngine.getCurrentToken().getLiterals().length();
+            result.getSqlTokens().add(new SchemaToken(beginPosition, lexerEngine.getCurrentToken().getLiterals(), null));
+        }
+        return result;
+    }
+
+    private DALStatement parseShowColumnsFields(final LexerEngine lexerEngine) {
+        DALStatement result = new ShowColumnsStatement();
+        lexerEngine.skipIfEqual(DefaultKeyword.FROM, DefaultKeyword.IN);
+        parseSingleTableWithSchema(lexerEngine, result);
+        if (lexerEngine.skipIfEqual(DefaultKeyword.FROM, DefaultKeyword.IN)) {
+            int beginPosition = lexerEngine.getCurrentToken().getEndPosition() - lexerEngine.getCurrentToken().getLiterals().length();
+            result.getSqlTokens().add(new SchemaToken(beginPosition, lexerEngine.getCurrentToken().getLiterals(), null));
+        }
+        return result;
+    }
+
+    private void parseSingleTableWithSchema(final LexerEngine lexerEngine, final SQLStatement sqlStatement) {
+        int beginPosition = lexerEngine.getCurrentToken().getEndPosition() - lexerEngine.getCurrentToken().getLiterals().length();
+        String literals = lexerEngine.getCurrentToken().getLiterals();
+        lexerEngine.nextToken();
+        if (lexerEngine.skipIfEqual(Symbol.DOT)) {
+            sqlStatement.getSqlTokens().add(new SchemaToken(beginPosition, literals, null));
+            lexerEngine.nextToken(); 
+        }
+    }
+
+    private DALStatement parseShowIndex(final LexerEngine lexerEngine) {
+        DALStatement result = new ShowIndexStatement();
+        lexerEngine.skipIfEqual(DefaultKeyword.FROM, DefaultKeyword.IN);
+        parseSingleTableWithSchema(lexerEngine, result);
+        if (lexerEngine.skipIfEqual(DefaultKeyword.FROM, DefaultKeyword.IN)) {
+            int beginPosition = lexerEngine.getCurrentToken().getEndPosition() - lexerEngine.getCurrentToken().getLiterals().length();
+            result.getSqlTokens().add(new SchemaToken(beginPosition, lexerEngine.getCurrentToken().getLiterals(), null));
+        }
+        return result;
+    }
+
+    private DALStatement parseShowTableStatus(final LexerEngine lexerEngine) {
+        DALStatement result = new ShowTableStatusStatement();
+        lexerEngine.nextToken();
+        if (lexerEngine.skipIfEqual(DefaultKeyword.FROM, DefaultKeyword.IN)) {
+            int beginPosition = lexerEngine.getCurrentToken().getEndPosition() - lexerEngine.getCurrentToken().getLiterals().length();
+            result.getSqlTokens().add(new SchemaToken(beginPosition, lexerEngine.getCurrentToken().getLiterals(), null));
+        }
+        return result;
+    }
 }

sharding-core/src/main/java/io/shardingsphere/core/parsing/parser/clause/TableReferencesClauseParser.java

@@ -95,6 +95,7 @@ protected final void parseTableFactor(final SQLStatement sqlStatement, final boo
         if (lexerEngine.skipIfEqual(Symbol.DOT)) {
             skippedSchemaNameLength = literals.length() + Symbol.DOT.getLiterals().length();
             literals = lexerEngine.getCurrentToken().getLiterals();
+            lexerEngine.nextToken();
         }
         String tableName = SQLUtil.getExactlyValue(literals);
         if (Strings.isNullOrEmpty(tableName)) {

sharding-core/src/main/java/io/shardingsphere/core/parsing/parser/dialect/mysql/sql/MySQLShowParser.java

@@ -17,10 +17,12 @@
 
 package io.shardingsphere.core.parsing.parser.dialect.mysql.sql;
 
+import com.google.common.base.Optional;
 import io.shardingsphere.core.parsing.lexer.LexerEngine;
 import io.shardingsphere.core.parsing.lexer.dialect.mysql.MySQLKeyword;
 import io.shardingsphere.core.parsing.lexer.token.DefaultKeyword;
 import io.shardingsphere.core.parsing.parser.clause.TableReferencesClauseParser;
+import io.shardingsphere.core.parsing.parser.context.table.Table;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowColumnsStatement;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowCreateTableStatement;
 import io.shardingsphere.core.parsing.parser.dialect.mysql.statement.ShowDatabasesStatement;
@@ -32,7 +34,9 @@
 import io.shardingsphere.core.parsing.parser.sql.dal.show.AbstractShowParser;
 import io.shardingsphere.core.parsing.parser.token.RemoveToken;
 import io.shardingsphere.core.parsing.parser.token.SchemaToken;
+import io.shardingsphere.core.parsing.parser.token.TableToken;
 import io.shardingsphere.core.rule.ShardingRule;
+import io.shardingsphere.core.util.SQLUtil;
 import lombok.RequiredArgsConstructor;
 
 /**
@@ -82,7 +86,21 @@ private DALStatement showDatabases() {
     }
 
     private DALStatement parseShowTableStatus() {
-        return new ShowTableStatusStatement();
+        DALStatement result = new ShowTableStatusStatement();
+        lexerEngine.nextToken();
+        if (lexerEngine.equalAny(DefaultKeyword.FROM, DefaultKeyword.IN)) {
+            int beginPosition = lexerEngine.getCurrentToken().getEndPosition() - lexerEngine.getCurrentToken().getLiterals().length();
+            lexerEngine.nextToken();
+            result.getSqlTokens().add(new RemoveToken(beginPosition, lexerEngine.getCurrentToken().getEndPosition()));
+        }
+        lexerEngine.nextToken();
+        if (lexerEngine.skipIfEqual(DefaultKeyword.LIKE)) {
+            int beginPosition = lexerEngine.getCurrentToken().getEndPosition() - lexerEngine.getCurrentToken().getLiterals().length() - 1;
+            String literals = lexerEngine.getCurrentToken().getLiterals();
+            result.getSqlTokens().add(new TableToken(beginPosition, 0, literals));
+            result.getTables().add(new Table(SQLUtil.getExactlyValue(literals), Optional.<String>absent()));
+        }
+        return result;
     }
 
     private DALStatement parseShowTables() {

sharding-core/src/main/java/io/shardingsphere/core/parsing/parser/dialect/mysql/statement/SetStatement.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2016-2018 shardingsphere.io.
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * </p>
+ */
+
+package io.shardingsphere.core.parsing.parser.dialect.mysql.statement;
+
+import io.shardingsphere.core.parsing.parser.sql.tcl.TCLStatement;
+
+/**
+ * Set statement.
+ * 
+ * @author chenqingyang
+ */
+public final class SetStatement extends TCLStatement {
+}

sharding-core/src/main/java/io/shardingsphere/core/parsing/parser/sql/tcl/TCLStatement.java

@@ -33,7 +33,7 @@
  * @author zhangliang
  */
 @ToString(callSuper = true)
-public final class TCLStatement extends AbstractSQLStatement {
+public class TCLStatement extends AbstractSQLStatement {
 
     private static final Collection<Keyword> STATEMENT_PREFIX = Arrays.<Keyword>asList(
             DefaultKeyword.SET, DefaultKeyword.COMMIT, DefaultKeyword.ROLLBACK, DefaultKeyword.SAVEPOINT, DefaultKeyword.BEGIN);

sharding-core/src/main/java/io/shardingsphere/core/rewrite/SQLBuilder.java

@@ -29,6 +29,7 @@
 import io.shardingsphere.core.routing.SQLUnit;
 import io.shardingsphere.core.routing.type.TableUnit;
 import io.shardingsphere.core.rule.DataNode;
+import io.shardingsphere.core.rule.MasterSlaveRule;
 import io.shardingsphere.core.rule.ShardingRule;
 
 import java.util.ArrayList;
@@ -118,6 +119,25 @@ public SQLUnit toSQL(final TableUnit tableUnit, final Map<String, String> logicA
         return new SQLUnit(result.toString(), parameterSets);
     }
 
+    /**
+     * Convert to sql for master slave rule.
+     * 
+     * @param masterSlaveRule master slave rule
+     * @param shardingDataSourceMetaData sharding data source meta data
+     * @return SQL
+     */
+    public String toSQL(final MasterSlaveRule masterSlaveRule, final ShardingDataSourceMetaData shardingDataSourceMetaData) {
+        StringBuilder result = new StringBuilder();
+        for (Object each : segments) {
+            if (each instanceof SchemaPlaceholder) {
+                result.append(shardingDataSourceMetaData.getActualDataSourceMetaData(masterSlaveRule.getMasterDataSourceName()).getSchemeName());
+            } else {
+                result.append(each);
+            }
+        }
+        return result.toString();
+    }
+
     private void appendTablePlaceholder(final TablePlaceholder tablePlaceholder, final String actualTableName, final StringBuilder stringBuilder) {
         final String logicTableName = tablePlaceholder.getLogicTableName();
         final String originalLiterals = tablePlaceholder.getOriginalLiterals();

sharding-core/src/main/java/io/shardingsphere/core/rewrite/SQLRewriteEngine.java

@@ -33,6 +33,7 @@
 import io.shardingsphere.core.parsing.parser.token.ItemsToken;
 import io.shardingsphere.core.parsing.parser.token.OffsetToken;
 import io.shardingsphere.core.parsing.parser.token.OrderByToken;
+import io.shardingsphere.core.parsing.parser.token.RemoveToken;
 import io.shardingsphere.core.parsing.parser.token.RowCountToken;
 import io.shardingsphere.core.parsing.parser.token.SQLToken;
 import io.shardingsphere.core.parsing.parser.token.SchemaToken;
@@ -138,6 +139,8 @@ public SQLBuilder rewrite(final boolean isRewriteLimit) {
                 appendOrderByToken(result, count, sqlTokens);
             } else if (each instanceof InsertColumnToken) {
                 appendSymbolToken(result, (InsertColumnToken) each, count, sqlTokens);
+            } else if (each instanceof RemoveToken) {
+                appendRest(result, count, sqlTokens, ((RemoveToken) each).getEndPosition());
             }
             count++;
         }