Adding type handler for hstore / Map.class

Added bug version level

build.gradle

@@ -7,7 +7,7 @@ plugins {
 }
 
 group = 'io.edpn.backend'
-version = '0.0.1-SNAPSHOT'
+version = '0.0.1.8-SNAPSHOT'//TODO REMOVE DEBUGGING VERSION AND BUMP TO LATEST
 compileJava.options.encoding = 'UTF-8'
 
 repositories {
@@ -24,10 +24,12 @@ repositories {
 
 ext {
     mybatisSpringBootVersion = '3.0.2'
+    postgresqlVersion = '42.6.0'
 }
 
 dependencies {
     implementation "org.mybatis.spring.boot:mybatis-spring-boot-starter:${mybatisSpringBootVersion}"
+    implementation "org.postgresql:postgresql:${postgresqlVersion}"
 }
 
 

src/main/java/io/edpn/backend/mybatisutil/StringDoubleMapTypeHandler.java

@@ -0,0 +1,52 @@
+package io.edpn.backend.mybatisutil;
+
+import org.apache.ibatis.type.BaseTypeHandler;
+import org.apache.ibatis.type.JdbcType;
+import org.apache.ibatis.type.MappedJdbcTypes;
+import org.apache.ibatis.type.MappedTypes;
+import org.postgresql.util.HStoreConverter;
+
+import java.sql.CallableStatement;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+@MappedTypes(Map.class)
+public class StringDoubleMapTypeHandler extends BaseTypeHandler<Map<String, Double>> {
+
+    @Override
+    public void setNonNullParameter(PreparedStatement ps, int i, Map<String, Double> parameter, JdbcType jdbcType) throws SQLException {
+        ps.setString(i, HStoreConverter.toString(parameter));
+    }
+
+    @Override
+    public Map<String, Double> getNullableResult(ResultSet rs, String columnName) throws SQLException {
+        return readMap(rs.getString(columnName));
+    }
+
+    @Override
+    public Map<String, Double> getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
+        return readMap(rs.getString(columnIndex));
+    }
+
+    @Override
+    public Map<String, Double> getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
+        return readMap(cs.getString(columnIndex));
+    }
+
+    private Map<String, Double> readMap(String hstring) throws SQLException {
+        if (hstring != null) {
+            Map<String, Double> map = new LinkedHashMap<>();
+            Map<String, String> rawMap = HStoreConverter.fromString(hstring);
+            for (Map.Entry<String, String> entry : rawMap.entrySet()) {
+                map.put(entry.getKey(), Double.parseDouble(entry.getValue())); // convert from <String, String> to <String,Double>
+            }
+
+            return map;
+        }
+        return null;
+    }
+}
+

src/main/java/module-info.java

@@ -2,6 +2,7 @@
     requires java.sql;
     requires org.mybatis.spring;
     requires org.mybatis;
+    requires org.postgresql.jdbc;
 
     exports io.edpn.backend.mybatisutil;
 }