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[Legend SQL] Support second format of transaction isolation query (#3274
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143 changes: 143 additions & 0 deletions
143
...main/java/org/finos/legend/engine/postgres/handler/txn/TxnIsolationPreparedStatement.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| // Copyright 2023 Goldman Sachs | ||
| // | ||
| // 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. | ||
| // | ||
|
|
||
| package org.finos.legend.engine.postgres.handler.txn; | ||
|
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| import org.finos.legend.engine.postgres.handler.PostgresPreparedStatement; | ||
| import org.finos.legend.engine.postgres.handler.PostgresResultSet; | ||
| import org.finos.legend.engine.postgres.handler.PostgresResultSetMetaData; | ||
|
|
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| import java.sql.ParameterMetaData; | ||
| import java.sql.Types; | ||
|
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| public class TxnIsolationPreparedStatement implements PostgresPreparedStatement | ||
| { | ||
| private boolean isComplete = false; | ||
| static final String READ_COMMITTED = "read committed"; | ||
| static final PostgresResultSetMetaData TXN_ISOLATION_RS_META_DATA = new PostgresResultSetMetaData() | ||
| { | ||
| @Override | ||
| public int getColumnCount() | ||
| { | ||
| return 1; | ||
| } | ||
|
|
||
| @Override | ||
| public String getColumnName(int i) | ||
| { | ||
| return "transaction_isolation"; | ||
| } | ||
|
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| @Override | ||
| public int getColumnType(int i) | ||
| { | ||
| return Types.VARCHAR; | ||
| } | ||
|
|
||
| @Override | ||
| public int getScale(int i) | ||
| { | ||
| return 0; | ||
| } | ||
| }; | ||
|
|
||
| @Override | ||
| public void setObject(int i, Object o) | ||
| { | ||
| // empty statement doesn't require objects to be set | ||
| } | ||
|
|
||
| @Override | ||
| public PostgresResultSetMetaData getMetaData() | ||
| { | ||
| return TXN_ISOLATION_RS_META_DATA; | ||
| } | ||
|
|
||
| @Override | ||
| public ParameterMetaData getParameterMetaData() | ||
| { | ||
| return null; | ||
| } | ||
|
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||
| @Override | ||
| public void close() throws Exception | ||
| { | ||
| // txn isolation handler doesn't require closure | ||
| } | ||
|
|
||
| @Override | ||
| public void setMaxRows(int maxRows) | ||
| { | ||
| // txn isolation handler doesn't require max rows | ||
| } | ||
|
|
||
| @Override | ||
| public int getMaxRows() | ||
| { | ||
| return 0; | ||
| } | ||
|
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||
| @Override | ||
| public boolean isExecuted() | ||
| { | ||
| return true; | ||
| } | ||
|
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||
| @Override | ||
| public boolean execute() | ||
| { | ||
| return true; | ||
| } | ||
|
|
||
| @Override | ||
| public PostgresResultSet getResultSet() | ||
| { | ||
| return new PostgresResultSet() | ||
| { | ||
| @Override | ||
| public PostgresResultSetMetaData getMetaData() | ||
| { | ||
| return TXN_ISOLATION_RS_META_DATA; | ||
| } | ||
|
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||
| @Override | ||
| public Object getObject(int i) | ||
| { | ||
| return READ_COMMITTED; | ||
| } | ||
|
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||
| @Override | ||
| public boolean next() | ||
| { | ||
| if (!isComplete) | ||
| { | ||
| isComplete = true; | ||
| return true; | ||
| } | ||
| else | ||
| { | ||
| return false; | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void close() | ||
| { | ||
| // txn isolation result set doesn't require closure | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| } |
35 changes: 35 additions & 0 deletions
35
...rc/main/java/org/finos/legend/engine/postgres/handler/txn/TxnIsolationSessionHandler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| // Copyright 2023 Goldman Sachs | ||
| // | ||
| // 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. | ||
| // | ||
|
|
||
| package org.finos.legend.engine.postgres.handler.txn; | ||
|
|
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| import org.finos.legend.engine.postgres.handler.PostgresPreparedStatement; | ||
| import org.finos.legend.engine.postgres.handler.PostgresStatement; | ||
| import org.finos.legend.engine.postgres.handler.SessionHandler; | ||
|
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| public class TxnIsolationSessionHandler implements SessionHandler | ||
| { | ||
| @Override | ||
| public PostgresPreparedStatement prepareStatement(String query) | ||
| { | ||
| return new TxnIsolationPreparedStatement(); | ||
| } | ||
|
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| @Override | ||
| public PostgresStatement createStatement() | ||
| { | ||
| return new TxnIsolationStatement(); | ||
| } | ||
| } |
79 changes: 79 additions & 0 deletions
79
...ver/src/main/java/org/finos/legend/engine/postgres/handler/txn/TxnIsolationStatement.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| // Copyright 2023 Goldman Sachs | ||
| // | ||
| // 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. | ||
| // | ||
|
|
||
| package org.finos.legend.engine.postgres.handler.txn; | ||
|
|
||
| import org.finos.legend.engine.postgres.handler.PostgresResultSet; | ||
| import org.finos.legend.engine.postgres.handler.PostgresResultSetMetaData; | ||
| import org.finos.legend.engine.postgres.handler.PostgresStatement; | ||
|
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| import static org.finos.legend.engine.postgres.handler.txn.TxnIsolationPreparedStatement.READ_COMMITTED; | ||
| import static org.finos.legend.engine.postgres.handler.txn.TxnIsolationPreparedStatement.TXN_ISOLATION_RS_META_DATA; | ||
|
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| public class TxnIsolationStatement implements PostgresStatement | ||
| { | ||
| private boolean isComplete = false; | ||
|
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| @Override | ||
| public boolean execute(String query) | ||
| { | ||
| return true; | ||
| } | ||
|
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| @Override | ||
| public PostgresResultSet getResultSet() | ||
| { | ||
| return new PostgresResultSet() | ||
| { | ||
| @Override | ||
| public PostgresResultSetMetaData getMetaData() | ||
| { | ||
| return TXN_ISOLATION_RS_META_DATA; | ||
| } | ||
|
|
||
| @Override | ||
| public Object getObject(int i) | ||
| { | ||
| return READ_COMMITTED; | ||
| } | ||
|
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| @Override | ||
| public boolean next() | ||
| { | ||
| if (!isComplete) | ||
| { | ||
| isComplete = true; | ||
| return true; | ||
| } | ||
| else | ||
| { | ||
| return false; | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void close() | ||
| { | ||
| // txn isolation result set doesn't require closure | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| @Override | ||
| public void close() throws Exception | ||
| { | ||
| // txn isolation handler doesn't require closure | ||
| } | ||
| } |
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