(iotdb) branch master updated: Modified implementation of exporting table schema to sql file using show create table (#16226)

[critas]

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The following commit(s) were added to refs/heads/master by this push:
     new 6924ab0be4a Modified implementation of exporting table schema to sql 
file using show create table (#16226)
6924ab0be4a is described below

commit 6924ab0be4a3552a724745819270502405bc0366
Author: LimJiaWenBrenda <88846228+ljw21...@users.noreply.github.com>
AuthorDate: Fri Aug 22 17:03:23 2025 +0800

    Modified implementation of exporting table schema to sql file using show 
create table (#16226)
    
    * Modified implementation of exporting schema to sql file using show create 
table
    
    * Added double quotation marks to tableName dropped
    
    * Used constant sql + escapeSqlIdentifier in sql sentence
---
 .../org/apache/iotdb/tool/common/Constants.java    |  2 +
 .../iotdb/tool/schema/ExportSchemaTable.java       | 44 +++++++++++++++++-----
 2 files changed, 36 insertions(+), 10 deletions(-)

diff --git 
a/iotdb-client/cli/src/main/java/org/apache/iotdb/tool/common/Constants.java 
b/iotdb-client/cli/src/main/java/org/apache/iotdb/tool/common/Constants.java
index 049291ac248..fe354559a3a 100644
--- a/iotdb-client/cli/src/main/java/org/apache/iotdb/tool/common/Constants.java
+++ b/iotdb-client/cli/src/main/java/org/apache/iotdb/tool/common/Constants.java
@@ -304,6 +304,8 @@ public class Constants {
   public static final String EXPORT_SCHEMA_COLUMNS_SELECT =
       "select * from information_schema.columns where database like '%s' and 
table_name like '%s'";
   public static final String EXPORT_SCHEMA_COLUMNS_DESC = "desc %s.%s details";
+  public static final String SHOW_CREATE_TABLE = "SHOW CREATE TABLE %s.%s";
+  public static final String DROP_TABLE_IF_EXIST = "DROP TABLE IF EXISTS %s";
 
   // import constants
   public static final String IMPORT_SCHEMA_CLI_PREFIX = "ImportSchema";
diff --git 
a/iotdb-client/cli/src/main/java/org/apache/iotdb/tool/schema/ExportSchemaTable.java
 
b/iotdb-client/cli/src/main/java/org/apache/iotdb/tool/schema/ExportSchemaTable.java
index 8a322665fca..41adc3b4cc7 100644
--- 
a/iotdb-client/cli/src/main/java/org/apache/iotdb/tool/schema/ExportSchemaTable.java
+++ 
b/iotdb-client/cli/src/main/java/org/apache/iotdb/tool/schema/ExportSchemaTable.java
@@ -176,6 +176,16 @@ public class ExportSchemaTable extends 
AbstractExportSchema {
     }
   }
 
+  private String escapeSqlIdentifer(String identifier) {
+    if (StringUtils.isBlank(identifier)) {
+      return identifier;
+    }
+    if (identifier.contains("\"")) {
+      identifier = identifier.replace("\"", "\"\"");
+    }
+    return "\"" + identifier + "\"";
+  }
+
   @Override
   protected void exportSchemaToSqlFile() {
     File file = new File(targetDirectory);
@@ -191,17 +201,13 @@ public class ExportSchemaTable extends 
AbstractExportSchema {
       try (ITableSession session = sessionPool.getSession()) {
         sessionDataSet =
             session.executeQueryStatement(
-                String.format(Constants.EXPORT_SCHEMA_COLUMNS_SELECT, 
database, tableName));
-        exportSchemaBySelect(sessionDataSet, fileName, tableName, comment);
+                String.format(
+                    Constants.SHOW_CREATE_TABLE,
+                    escapeSqlIdentifer(database),
+                    escapeSqlIdentifer(tableName)));
+        exportSchemaByShowCreate(sessionDataSet, fileName, tableName);
       } catch (IoTDBConnectionException | StatementExecutionException | 
IOException e) {
-        try (ITableSession session = sessionPool.getSession()) {
-          sessionDataSet =
-              session.executeQueryStatement(
-                  String.format(Constants.EXPORT_SCHEMA_COLUMNS_DESC, 
database, tableName));
-          exportSchemaByDesc(sessionDataSet, fileName, tableName, comment);
-        } catch (IoTDBConnectionException | StatementExecutionException | 
IOException e1) {
-          ioTPrinter.println(Constants.COLUMN_SQL_MEET_ERROR_MSG + 
e.getMessage());
-        }
+        ioTPrinter.println(Constants.COLUMN_SQL_MEET_ERROR_MSG + 
e.getMessage());
       } finally {
         if (ObjectUtils.isNotEmpty(sessionDataSet)) {
           try {
@@ -214,6 +220,24 @@ public class ExportSchemaTable extends 
AbstractExportSchema {
     }
   }
 
+  private void exportSchemaByShowCreate(
+      SessionDataSet sessionDataSet, String fileName, String tableName)
+      throws IoTDBConnectionException, StatementExecutionException, 
IOException {
+    String dropSql =
+        String.format(Constants.DROP_TABLE_IF_EXIST, 
escapeSqlIdentifer(tableName)) + ";\n";
+    StringBuilder sb = new StringBuilder(dropSql);
+    try (FileWriter writer = new FileWriter(fileName, true)) {
+      while (sessionDataSet.hasNext()) {
+        RowRecord rowRecord = sessionDataSet.next();
+        String res = rowRecord.getField(1).getStringValue();
+        sb.append(res);
+        sb.append(";\n");
+      }
+      writer.append(sb.toString());
+      writer.flush();
+    }
+  }
+
   private void exportSchemaByDesc(
       SessionDataSet sessionDataSet, String fileName, String tableName, String 
tableComment)
       throws IoTDBConnectionException, StatementExecutionException, 
IOException {