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MyBatis EnumUsingDbCodeTypeHandler using interface
import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Arrays;
import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.MappedTypes;
@MappedTypes(EnumUsingDbCode.class)
public class EnumUsingDbCodeTypeHandler<E extends Enum<E> & EnumUsingDbCode> extends BaseTypeHandler<E> {
private final Class<E> type;
private final E[] enumConstants;
public EnumUsingDbCodeTypeHandler(Class<E> type) {
if (type == null) {
throw new IllegalArgumentException("Type argument cannot be null");
}
this.type = type;
this.enumConstants = type.getEnumConstants();
if (!type.isInterface() && this.enumConstants == null) {
throw new IllegalArgumentException(type.getSimpleName() + " does not represent an enum type.");
}
}
@Override
public void setNonNullParameter(PreparedStatement ps, int i, E parameter, JdbcType jdbcType) throws SQLException {
ps.setString(i, parameter.getDbCode());
}
@Override
public E getNullableResult(ResultSet rs, String columnName) throws SQLException {
String dbCode = rs.getString(columnName);
return rs.wasNull() ? null : getEnum(dbCode);
}
@Override
public E getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
String dbCode = rs.getString(columnIndex);
return rs.wasNull() ? null : getEnum(dbCode);
}
@Override
public E getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
String dbCode = cs.getString(columnIndex);
return cs.wasNull() ? null : getEnum(dbCode);
}
private E getEnum(String dbCode) {
return Arrays.stream(enumConstants)
.filter(e -> e.getDbCode().equals(dbCode))
.findFirst()
.orElseThrow(() -> new IllegalArgumentException("Cannot convert " + dbCode + " to " + type.getSimpleName()));
}
}
public interface EnumUsingDbCode {
String getDbCode();
}
@Getter
@RequiredArgsConstructor
public enum ExampleEnum implements EnumUsingDbCode {
EX1,
EX2
;
@Override
public String getDbCode() {
return this.name().toLowerCase();
}
}
@qb20nh

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@qb20nh qb20nh commented Oct 23, 2021

Thanks!

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