setamv opened a new issue #9971:
URL: https://github.com/apache/shardingsphere/issues/9971
## Bug Report
underscore in table name is not escaped while fetch table name meta data.
when i have 2 table: T_YSG_DEF_001、T_YS__DEF_001
when i start service, i encoutered the error like this: nested exception is
java.sql.SQLException: Column 'AR_CODE' not found.
### Which version of ShardingSphere did you use?
4.1.1
The Database is MySQL 8.0
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-JDBC
### Expected behavior
underscore in table name is escaped while fetch table name meta data
### Actual behavior
underscore in table name is not escaped while fetch table name meta data
### Reason analyze (If you can)
when execute code below in method ``ColumnMetaDataLoader#load(final
Connection connection, final String table, final String databaseType)``:
```
try (ResultSet resultSet =
connection.getMetaData().getColumns(connection.getCatalog(),
JdbcUtil.getSchema(connection, databaseType), table, "%")) {
while (resultSet.next()) {
String columnName = resultSet.getString(COLUMN_NAME);
columnTypes.add(resultSet.getInt(DATA_TYPE));
columnTypeNames.add(resultSet.getString(TYPE_NAME));
isPrimaryKeys.add(primaryKeys.contains(columnName));
columnNames.add(columnName);
}
}
```
it finally execute code bellow to fetch table names metadata in method
`com.mysql.jdbc.DatabaseMetaData#getTables(String catalog, String
schemaPattern, String tableNamePattern, final String[] types)`
```
try {
results = stmt
.executeQuery((!DatabaseMetaData.this.conn.versionMeetsMinimum(5, 0, 2) ? "SHOW
TABLES FROM " : "SHOW FULL TABLES FROM ")
+
StringUtils.quoteIdentifier(catalogStr, DatabaseMetaData.this.quotedId,
DatabaseMetaData.this.conn.getPedantic())
+ " LIKE " +
StringUtils.quoteIdentifier(tableNamePat, "'", true));
} catch (SQLException sqlEx) {
if
(SQLError.SQL_STATE_COMMUNICATION_LINK_FAILURE.equals(sqlEx.getSQLState())) {
throw sqlEx;
}
return;
}
```
the final SQL executed above is: `SHOW FULL TABLES FROM `my_schema_name`
LIKE 'T_YS__DEF_001'`，the underscore "_" in MySQL is a wildcard character, so
two table names matched（The character 'G' and '_' are both matched by the
wildcard character）:
T_YSG_DEF_001
T_YS__DEF_001
can you fix this by escape the underscore while fetch table name meta data
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
### Example codes for reproduce this issue (such as a github link).
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