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Added an extra check for an IS NOT NULL Constraint when checking an Oracle DB Column for Nullability (#2288) 

* Added an extra check for an IS NOT NULL Constraint when checking an Oracle DB Column for Nullability.
This commit is contained in:
Kevin Dougan SmileCDR 2021-01-19 08:44:41 -05:00 committed by GitHub
parent 649032681d
commit 240decc210
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1 changed files with 39 additions and 1 deletions
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hapi-fhir-jpaserver-migrate/src/main/java/ca/uhn/fhir/jpa/migrate/taskdef/ModifyColumnTask.java
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@ -22,10 +22,14 @@ package ca.uhn.fhir.jpa.migrate.taskdef;
import ca.uhn.fhir.jpa.migrate.JdbcUtils;
import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
import org.intellij.lang.annotations.Language;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.jdbc.core.ColumnMapRowMapper;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class ModifyColumnTask extends BaseTableColumnTypeTask {
@ -56,7 +60,7 @@ public class ModifyColumnTask extends BaseTableColumnTypeTask {
try {
existingType = JdbcUtils.getColumnType(getConnectionProperties(), getTableName(), getColumnName());
nullable = JdbcUtils.isColumnNullable(getConnectionProperties(), getTableName(), getColumnName());
nullable = isColumnNullable(getTableName(), getColumnName());
} catch (SQLException e) {
throw new InternalErrorException(e);
}
@ -152,4 +156,38 @@ public class ModifyColumnTask extends BaseTableColumnTypeTask {
}
}
private boolean isColumnNullable(String tableName, String columnName) throws SQLException {
boolean result = JdbcUtils.isColumnNullable(getConnectionProperties(), tableName, columnName);
// Oracle sometimes stores the NULLABLE property in a Constraint, so override the result if this is an Oracle DB
switch (getDriverType()) {
case ORACLE_12C:
@Language("SQL") String findNullableConstraintSql =
"SELECT acc.owner, acc.table_name, acc.column_name, search_condition_vc " +
"FROM all_cons_columns acc, all_constraints ac " +
"WHERE acc.constraint_name = ac.constraint_name " +
"AND acc.table_name = ac.table_name " +
"AND ac.constraint_type = ? " +
"AND acc.table_name = ? " +
"AND acc.column_name = ? " +
"AND search_condition_vc = ? ";
String[] params = new String[4];
params[0] = "C";
params[1] = tableName.toUpperCase();
params[2] = columnName.toUpperCase();
params[3] = "\"" + columnName.toUpperCase() + "\" IS NOT NULL";
List<Map<String, Object>> queryResults = getConnectionProperties().getTxTemplate().execute(t -> {
return getConnectionProperties().newJdbcTemplate().query(findNullableConstraintSql, params, new ColumnMapRowMapper());
});
// If this query returns a row then the existence of that row indicates that a NOT NULL constraint exists
// on this Column and we must override whatever result was previously calculated and set it to false
if (queryResults != null && queryResults.size() > 0 && queryResults.get(0) != null && !queryResults.get(0).isEmpty()) {
result = false;
}
break;
default:
// Do nothing since we already initialized the variable above
break;
}
return result;
}
}