Updated stored procedure for replacing string text values for block type fields.

replaceFieldValue.sql

CREATE PROCEDURE replaceFieldValueTo  (IN v_string_from VARCHAR(255), IN v_string_to VARCHAR(255))
BEGIN
  DECLARE done INT DEFAULT FALSE;
  DECLARE table_name_value VARCHAR(64);
  DECLARE column_name_value VARCHAR(64);
  DECLARE cursor_fields CURSOR FOR SELECT TABLE_NAME, COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME LIKE 'block_content_%' AND COLUMN_NAME LIKE 'field_%_value' AND DATA_TYPE = 'varchar';
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
    
  OPEN cursor_fields;

  ColumnList: LOOP
    FETCH cursor_fields INTO table_name_value, column_name_value;
    
    IF done THEN 
      Leave ColumnList;
    END IF;
    
    SET @sql = CONCAT('UPDATE ', table_name_value, ' SET ', column_name_value, ' = replace(', column_name_value, ', "', v_string_from, '", "', v_string_to ,'")');
    
    PREPARE stmt FROM @sql;
    EXECUTE stmt;
    DEALLOCATE PREPARE stmt;
  END LOOP;

  CLOSE cursor_fields;
END;