feat: support PG show transaction isolation level (#1777)

* feat: support PG show transaction isolation level Adds support for the PostgreSQL statement SHOW TRANSACTION ISOLATION LEVEL. This statement is used by the PG JDBC driver to get the isolation level of a connection. The statement will always return the static string 'serializable', as that is the only isolation level Spangres supports. * build: force rebuild
googleapis · Mar 24, 2022 · 111f74c · 111f74c
1 parent 6550a9d
commit 111f74c
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Showing 6 changed files with 9,820 additions and 9,803 deletions.
diff --git a/...panner/src/main/java/com/google/cloud/spanner/connection/ConnectionStatementExecutor.java b/...panner/src/main/java/com/google/cloud/spanner/connection/ConnectionStatementExecutor.java
@@ -109,4 +109,6 @@ StatementResult statementSetPgSessionCharacteristicsTransactionMode(
   StatementResult statementSetRPCPriority(Priority priority);
 
   StatementResult statementShowRPCPriority();
+
+  StatementResult statementShowTransactionIsolationLevel();
 }
diff --git a/...er/src/main/java/com/google/cloud/spanner/connection/ConnectionStatementExecutorImpl.java b/...er/src/main/java/com/google/cloud/spanner/connection/ConnectionStatementExecutorImpl.java
@@ -49,6 +49,7 @@
 import static com.google.cloud.spanner.connection.StatementResult.ClientSideStatementType.SHOW_RPC_PRIORITY;
 import static com.google.cloud.spanner.connection.StatementResult.ClientSideStatementType.SHOW_STATEMENT_TAG;
 import static com.google.cloud.spanner.connection.StatementResult.ClientSideStatementType.SHOW_STATEMENT_TIMEOUT;
+import static com.google.cloud.spanner.connection.StatementResult.ClientSideStatementType.SHOW_TRANSACTION_ISOLATION_LEVEL;
 import static com.google.cloud.spanner.connection.StatementResult.ClientSideStatementType.SHOW_TRANSACTION_TAG;
 import static com.google.cloud.spanner.connection.StatementResult.ClientSideStatementType.START_BATCH_DDL;
 import static com.google.cloud.spanner.connection.StatementResult.ClientSideStatementType.START_BATCH_DML;
@@ -436,4 +437,9 @@ public StatementResult statementShowRPCPriority() {
             : getConnection().getRPCPriority(),
         SHOW_RPC_PRIORITY);
   }
+
+  @Override
+  public StatementResult statementShowTransactionIsolationLevel() {
+    return resultSet("transaction_isolation", "serializable", SHOW_TRANSACTION_ISOLATION_LEVEL);
+  }
 }
diff --git a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/connection/StatementResult.java b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/connection/StatementResult.java
@@ -82,7 +82,8 @@ enum ClientSideStatementType {
     RUN_BATCH,
     ABORT_BATCH,
     SET_RPC_PRIORITY,
-    SHOW_RPC_PRIORITY
+    SHOW_RPC_PRIORITY,
+    SHOW_TRANSACTION_ISOLATION_LEVEL
   }
 
   /**

diff --git a/...anner/src/main/resources/com/google/cloud/spanner/connection/PG_ClientSideStatements.json b/...anner/src/main/resources/com/google/cloud/spanner/connection/PG_ClientSideStatements.json
@@ -125,6 +125,14 @@
       "method": "statementShowRPCPriority",
       "exampleStatements": ["show spanner.rpc_priority","show variable spanner.rpc_priority"]
     },
+    {
+      "name": "SHOW [VARIABLE] TRANSACTION ISOLATION LEVEL",
+      "executorName": "ClientSideStatementNoParamExecutor",
+      "resultType": "RESULT_SET",
+      "regex": "(?is)\\A\\s*show\\s+(?:variable\\s+)?transaction\\s*isolation\\s*level\\s*\\z",
+      "method": "statementShowTransactionIsolationLevel",
+      "exampleStatements": ["show transaction isolation level","show variable transaction isolation level"]
+    },
     {
       "name": "{START | BEGIN} [TRANSACTION | WORK] [{ (READ ONLY|READ WRITE) | (ISOLATION LEVEL (DEFAULT|SERIALIZABLE)) }]",
       "executorName": "ClientSideStatementPgBeginExecutor",