Aman-Mittal commented on code in PR #5410:
URL: https://github.com/apache/fineract/pull/5410#discussion_r2747231692


##########
fineract-provider/src/main/java/org/apache/fineract/portfolio/client/service/ClientReadPlatformServiceImpl.java:
##########
@@ -601,6 +602,29 @@ public Long retrieveClientIdByExternalId(final ExternalId 
externalId) {
         return clientRepositoryWrapper.findIdByExternalId(externalId);
     }
 
+    @Override
+    public ClientPerformanceData retrieveClientPerformance(final Long 
clientId) {
+        try {
+            final String checkClientSql = "SELECT count(*) FROM m_client WHERE 
id = ?";
+            final Integer count = 
this.jdbcTemplate.queryForObject(checkClientSql, Integer.class, clientId);
+            if (count == null || count == 0) {
+                throw new ClientNotFoundException(clientId);
+            }
+            final String sql = "SELECT " + "(SELECT COUNT(*) FROM m_loan WHERE 
client_id = c.id AND loan_status_id = 300) as activeLoans, "
+                    + "(SELECT COALESCE(SUM(principal_outstanding_derived + 
interest_outstanding_derived + fee_charges_outstanding_derived + 
penalty_charges_outstanding_derived), 0) "
+                    + " FROM m_loan WHERE client_id = c.id AND loan_status_id 
= 300) as totalOutstanding "
+                    + "FROM m_client c WHERE c.id = ?";

Review Comment:
   StringBuilder will help if the sql written here was dynamic but i can see 
there is a simple static string. In that case there is no performance gain 
using this. This will make it harder to review lateron



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