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Posted to notifications@shardingsphere.apache.org by "darw-soptim (via GitHub)" <gi...@apache.org> on 2024/12/03 12:43:04 UTC
[I] Escape '\' in SQL causes .DialectSQLParsingException: [shardingsphere]
darw-soptim opened a new issue, #33902:
URL: https://github.com/apache/shardingsphere/issues/33902
## Bug Report
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### Which version of ShardingSphere did you use?
5.5.1
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere
### Expected behavior
I am querying for "NAME_\\\\%\_% "
it should output
Row: head_id=1, head_name=NAME_%\_1
Row: head_id=2, head_name=NAME_%\_2
Row: head_id=3, head_name=NAME_%\_3
Row: head_id=4, head_name=NAME_%\_4
Row: head_id=5, head_name=NAME_%\_5
### Actual behavior
but got this error. most likely due to ESCAPE '\'
org.apache.shardingsphere.infra.exception.dialect.exception.syntax.sql.DialectSQLParsingException: You have an error in your SQL syntax: SELECT th1_0.head_id, th1_0.head_name FROM mtsm_timeseries.ts_head th1_0 WHERE th1_0.head_name like ? ESCAPE '\' ORDER BY th1_0.head_id OFFSET ? ROWS FETCH FIRST ? ROWS ONLY, null
at org.apache.shardingsphere.infra.parser.ShardingSphereSQLParserEngine.getException(ShardingSphereSQLParserEngine.java:66)
at org.apache.shardingsphere.infra.parser.ShardingSphereSQLParserEngine.parse(ShardingSphereSQLParserEngine.java:59)
at org.apache.shardingsphere.driver.jdbc.core.statement.ShardingSpherePreparedStatement.parseSQL(ShardingSpherePreparedStatement.java:163)
at org.apache.shardingsphere.driver.jdbc.core.statement.ShardingSpherePreparedStatement.<init>(ShardingSpherePreparedStatement.java:145)
at org.apache.shardingsphere.driver.jdbc.core.statement.ShardingSpherePreparedStatement.<init>(ShardingSpherePreparedStatement.java:117)
at org.apache.shardingsphere.driver.jdbc.core.connection.ShardingSphereConnection.prepareStatement(ShardingSphereConnection.java:111)
at ShardingIntegrationTest.testQueryWithLikeAndPagination(ShardingIntegrationTest.java:115)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
### Reason analyze (If you can)
If i put single '\\' then i will get this error:
java.sql.SQLDataException: ORA-01425: Escapezeichen muss eine Zeichenfolge der Länge 1 sein
Caused by: Error : 1425, Position : 95, Sql = SELECT th1_0.head_id, th1_0.head_name FROM TS_HEAD th1_0 WHERE th1_0.head_name like :1 ESCAPE '' ORDER BY th1_0.head_id OFFSET :2 ROWS FETCH FIRST :3 ROWS ONLY, OriginalSql = SELECT th1_0.head_id, th1_0.head_name FROM TS_HEAD th1_0 WHERE th1_0.head_name like ? **ESCAPE ''** ORDER BY th1_0.head_id OFFSET ? ROWS FETCH FIRST ? ROWS ONLY, Error Msg = ORA-01425: Escapezeichen muss eine Zeichenfolge der Länge 1 sein
if i put four '\\\\\\\\\' then i will get this error:
java.sql.SQLDataException: ORA-01425: Escapezeichen muss eine Zeichenfolge der Länge 1 sein
Caused by: Error : 1425, Position : 95, Sql = SELECT th1_0.head_id, th1_0.head_name FROM TS_HEAD th1_0 WHERE th1_0.head_name like :1 ESCAPE '\\' ORDER BY th1_0.head_id OFFSET :2 ROWS FETCH FIRST :3 ROWS ONLY, OriginalSql = SELECT th1_0.head_id, th1_0.head_name FROM TS_HEAD th1_0 WHERE th1_0.head_name like ? **ESCAPE '\\'** ORDER BY th1_0.head_id OFFSET ? ROWS FETCH FIRST ? ROWS ONLY, Error Msg = ORA-01425: Escapezeichen muss eine Zeichenfolge der Länge 1 sein
**Possible reason:** When the ESCAPE '\\\\' is passed to the ShardingSphere parser, it receives it as '\\' fails to parse correctly due to an illegal escape character—here it should instead be '\\\\'. However, testing with '\\\\\\\\' reveals that the ShardingSphere parser interprets it as '\\\\' and parses it correctly. After parsing, it forwards '\\\\' to Oracle, which results in the error ORA-0142
Testing with $ as escape character output the correct behaviour. Problen here seems the backslashes
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc.
sharding.yaml
```yaml
mode:
type: Standalone
repository:
type: JDBC
dataSources:
ds_0:
dataSourceClassName: com.zaxxer.hikari.HikariDataSource
driverClassName: oracle.jdbc.OracleDriver
jdbcUrl: jdbc:oracle:thin:@localhost:1521/FREEPDB1
username: system
password: oracle
maximumPoolSize: 10
ds_1:
dataSourceClassName: com.zaxxer.hikari.HikariDataSource
driverClassName: oracle.jdbc.OracleDriver
jdbcUrl: jdbc:oracle:thin:@localhost:1522/FREEPDB1
username: system
password: oracle
maximumPoolSize: 10
rules:
- !SHARDING
tables:
TS_HEAD:
actualDataNodes: ds_${0..1}.TS_HEAD
databaseStrategy:
standard:
shardingColumn: head_id
shardingAlgorithmName: head_mod
shardingAlgorithms:
head_mod:
type: INLINE
props:
algorithm-expression: ds_${Math.abs(head_id.hashCode()) % 2}
props:
sql-show: true
check-table-metadata-enabled : true
sqlFederation:
sqlFederationEnabled: true
executionPlanCache:
initialCapacity: 2000
maximumSize: 65535
```
### Example codes for reproduce this issue (such as a github link).
Test Class
```java
class ShardingIntegrationTest {
private static final String SHARDINGSPHERE_URL = "jdbc:shardingsphere:classpath:sharding.yaml";
private static final String SHARDINGSPHERE_USERNAME = "system";
private static final String SHARDINGSPHERE_PASSWORD = "oracle"
@Test
void testQueryWithLikeAndPagination() throws Exception {
try (Connection connection = DriverManager.getConnection(SHARDINGSPHERE_URL, SHARDINGSPHERE_USERNAME, SHARDINGSPHERE_PASSWORD);
PreparedStatement stmt = connection.prepareStatement(
"SELECT th1_0.head_id, th1_0.head_name " +
"FROM mtsm_timeseries.ts_head th1_0 " +
"WHERE th1_0.head_name like ? ESCAPE '\\' " +
"ORDER BY th1_0.head_id " +
"OFFSET ? ROWS FETCH FIRST ? ROWS ONLY")) {
// Set query parameters
stmt.setString(1, "NAME_\\%_%"); // Match all names starting with "NAME_"
stmt.setInt(2, 0); // Offset
stmt.setInt(3, 10); // Limit (fetch first 10 rows)
try (ResultSet rs = stmt.executeQuery()) {
int rowCount = 0;
while (rs.next()) {
System.out.println("Row: head_id=" + rs.getInt("head_id") + ", head_name=" + rs.getString("head_name"));
rowCount++;
}
assertTrue(rowCount > 0, "No rows returned");
}
}
}
}
```
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Re: [I] Escape '\' in SQL causes .DialectSQLParsingException: [shardingsphere]
Posted by "darw-soptim (via GitHub)" <gi...@apache.org>.
darw-soptim closed issue #33902: Escape '\' in SQL causes .DialectSQLParsingException:
URL: https://github.com/apache/shardingsphere/issues/33902
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